It is very important to measure the blood sugar value accurately, because if the measurement is not accurate, it is likely to lead to misdiagnosis, so in our daily life, when we measure our own blood glucose, how should we measure to be more accurate, especially for the measurement of the first drop of blood or the second drop of blood of the problem, many people are not yet very understanding, today Dr. Liu will talk to you about the correct measurement of blood glucose.

First of all, to answer the question of whether people are accurate with first blood or second blood?

For diabetic people, often need to measure their own blood glucose value at home, home blood glucose measurement is usually measured fingertip blood glucose, because this method of temperature measurement is very convenient and easy to use, the operation is also simple, and you can see the results immediately, but for the selection of the first drop of blood or the second drop of blood this issue, in fact, has always been a lot of controversy.

According to the newly released guidelines of the Chinese Expert Consensus on Clinical Practice and Quality Management Standard for Portable Blood Glucose Meter, after the blood collection needle pierces the skin, the blood pressure is gently pressed out, and then the first drop of blood is gently wiped off with a sterilized cotton ball, and then the second drop is put onto the test paper for testing. Because it is believed that the first drop of blood may oftenBecause of incomplete sterilization, small amounts of sterilized liquid mixed in the blood, etc., causing inaccuracies in blood glucose worthiness, and a second drop of blood eliminates these interferences.

However, some studies have also shown that in the case of cleaner hands, if alcohol is used to disinfect the hands, wait for the alcohol to dry and then perform a puncture, while not squeezing hard, and then take the first and second drops of blood for testing respectively, then theThere was no statistically significant difference in the final blood glucose values obtainedThat means there's actually basically no difference. And dividing the measurements for different blood glucose values revealed thatIf the patient's blood glucose level is not too high, then the first drop of blood is closer to the actual blood glucose level, while if the patient's blood glucose level is high, then the second drop of blood is more accurate.

So we can see from the above, in fact, for this question, so far the industry is not completely standard answer. So what should we ordinary people do?Dr. Liu believes that if it is an ordinary family measurement, in fact, there is no need to be too entangled in this issue, under the premise of good disinfection, you can just use the first drop of blood measurement.

So, which finger is better to pick for blood collection?

This is a question that many people struggle with, especially those who need to measure their blood glucose levels frequently. Here Dr. Liu suggests thatMake sure you don't stick it in the same place for a long time.Because this is not only easy to leave scars, but also easy to cause inaccurate results; and as for the pick which finger this problem, in fact, there is no standard answer, most people believe that usually the thumb and index finger these two are the most used fingers, and the sensory nerves are also very sensitive, so you can try not to choose these two commonly used fingers.You can choose to take turns collecting blood from your middle, pinky and ring fingers.Of course, this is just a suggestion, in fact, in addition to the fingertips, the palm of the hand, the size of the interspace between the fish, the dorsal side of the forearm, these locations, in fact, can be taken blood to measure blood glucose value.

In addition, to measure the blood glucose value, you need to pay attention to the following precautions.

If you want your blood glucose value to be measured accurately, Dr. Liu summarizes some points to pay attention to.

The first thing is to clean and sanitize the norm.Standardized cleaning and disinfection will help the blood glucose value results to be accurate and avoid the interference of some pollutants or tissue fluids. As for the disinfecting liquid, it is recommended to use 75% alcohol to disinfect as much as possible, and try not to choose iodine or povidone-iodine for disinfecting, as this is prone to cause high blood glucose value.

The second thing is that when taking blood, try toAvoid squeezing your fingers too hardOtherwise, it can easily lead to inaccurate blood glucose values.

The third is that the test strips must be freshSome of my friends have not used up a lot of the test strips after opening the bottle and continue to use them, which may actually affect the blood glucose value, so it is recommended that the test strips should be used up as much as possible within 3 months after they are opened. On the storage of test strips.Be careful to keep it dry, don't put it in a place where the temperature is too high, and try not to put it inside the refrigerator. And when testing, if the test strip has been inserted into the instrument, be sure to complete the entire measurement process within 2min.

The fourth is a reminder that both phlebotomy and fingertip taking are actually invasive operations, so you must be sure toBe mindful of the concept of asepsis thatAvoid some inflammation caused by long-term blood collection. In addition, for the elderly or children, it is necessary to pay attention to good psychological care before the measurement, to avoid inaccurate blood glucose values caused by emotional stress.

Saying that the second drop of blood is accurate is often due to the tendency to make small mistakes in taking your own blood glucose, resulting in a portion of tissue fluid being mixed in with the first drop of blood, and a lower blood glucose reading than it actually is.However, if the following steps are strictly followed, even the first drop of blood will measure an accurate blood glucose value.

Step 1: Cleaning in place

If you don't wash your hands to measure your blood glucose, the results will of course be inaccurate. For example, if you take blood from a hand that has just eaten an orange, the blood glucose value measured will definitely be high, because the fingertip blood is mixed with the sugar from the orange. But there's no need to sterilize with alcohol every time. Alcohol has the ability to dehydrate the skin, and prolonged use can dry out the skin and also affect blood glucose levels.

The correct way to do this is to simply wash your hands with soap and warm water before testing.

Step 2: Selecting the location for blood sampling

Repeated pricking in the same location can cause infection. "Ask the doctor" to recommend a method to help you find the appropriate location of the needle: hands together, ten fingers opposite each other, in the fingertips can be seen in the position of blood collection. The pain in this position will be relatively light, and not often used, easy to recover.

Step 3: The right way to take blood

• Before lancing, massage the finger area to be lanced from the root to the tip of the finger 5 to 6 times, drop the arm for 10 to 15 seconds, and shake the arm like a thermometer to ensure that there is enough blood to the fingertips.
  
• During blood collection, do not massage and squeeze the lancing site excessively to avoid squeezing out some of the tissue fluid and diluting the blood sample.
  
• After the needle is inserted, gently push the blood vessels on both sides of the finger to the front one-third of the finger, so that the blood slowly overflows, and a "small drop of blood" emerges.
  

Step Four. Blood collection needles should not be used repeatedly, and test strips should be matched

Blood collection needles should not be used repeatedly. Once a blood collection needle is used, the tip becomes more and more toned as it is used more often, increasing the pain. Also, bacteria can multiply on used blood collection needles.

Test strips should be kept dry, protected from light and sealed. Check the shelf life of the test strips before use, and choose test strips that are compatible with your blood glucose meter; expired or mismatched test strips are unlikely to measure true blood glucose levels.

Step Five:Proper Operation of Blood Glucose Meter

Although the blood glucose measured by the glucose meter is already very accurate, you should strictly follow the usage steps in the instruction manual when using it. Check the accuracy of the meter regularly and don't just leave it aside after each use.

The above content is organized by the "ask the doctor" team, want to know more authoritative health knowledge, welcome to pay attention to us!

Our country has an increasing number of sugar addicts, in the endocrinology, cardiovascular and neurology departments are also a gathering place for diabetic patients. After hospitalization, these diabetic patients need to monitor blood glucose, and when they go home, the doctor also instructs the patients that they must monitor their blood glucose on a regular basis. However, many patients are puzzled whether it is better to use the first drop of blood or the second drop of blood when measuring blood glucose. Many young doctors and nurses, including a small number of senior doctors, do not have a clear understanding of whether the first or second drop of blood glucose should be taken from the fingertip. Some doctors and nurses use the first drop of blood to measure blood glucose, while some doctors and nurses use the second drop of blood to measure blood glucose, which confuses the patients and makes them not understand which drop of blood should be used for testing.

In fact, this issue is where many clinical guidelines are controversial, and so far opinions have not been fully harmonized.

Let's start by reviewing some of the history of the controversy:

Prior to 2010, most foreign guidelines recommended the use of first blood, but a few foreign guidelines recommended the use of second blood.

In 2010, China's Ministry of Health explicitly stipulated in its clinical practice guidelines that a second drop of blood should be used for testing.

Both the 2011 Chinese guidelines and the 2013 US guidelines recommend testing after hand cleaning.Sides and tips of fingers, but neither emphasized the choice of first or second blood.

Experts who recommend first blood argue that collected second blood is subject toSqueezing fingers causes tissue fluid to thin the bloodThe use of the first drop of blood is simpler and saves blood for the patient.

Experts who recommend second blood argue that first blood may be subject toEffects of unevaporated alcohol, undried soapy water, or sugary substances on fingertips, is not as accurate as the blood glucose value in response to a second drop of blood.

Prof. Wang Xiaoli and Prof. Wang Dianhui then conducted experiments on two different fingertip blood glucose testing methods on hospitalized patients. The results showed that the first drop of fingertip blood and the second drop of fingertip blood, the measured blood glucose value is not exactly the same, and even the value of the second drop of blood of some patients is higher than the value of the first drop of blood. HoweverThe overall difference was again not statistically significant. It means.Either way can represent fingertip blood glucose values。

So, in summary, whether first blood or second blood is used may be more standardized if more research follows. As of now.Both are fine.。

It just requires some attention to detail:

1,If it is ensured that the finger is washed and dried with soapy water and the sterilizing alcohol is completely evaporated, the use of the first drop of blood for glucose determination is possible and is simpler and more convenient to perform, and also saves blood.

2,If you want to avoid the influence of alcohol or residual sugary substances on the fingertips, you can also choose to use a second drop of fingertip blood for testing. In addition, before collecting blood, you can let your arm hang down for a period of time, so that the blood at the end of the finger is more abundant, which is conducive to blood collection; squeeze the finger from the root of the finger to the distal end of the best flat pressure, do not squeeze the tip of the finger.

This is a very good question! As we know, the diagnosis of diabetes is inseparable from the measurement of blood glucose, and the usual blood glucose measurement is to draw venous blood as the blood sample for blood glucose measurement, however, because each time to draw venous blood, not only need to be operated by the professional medical personnel, but also will bring some inconvenience to the patient to come.

Therefore, at present, in addition to the formal diagnosis of diabetes mellitus as well as blood glucose review, must be carried out to extract venous blood for determination, the general diabetic patient's daily family blood glucose monitoring, can be completely equipped with their own portable blood glucose tester to monitor their own blood glucose changes, such blood glucose test value, also called fingertip blood glucose, because it is both trouble-free and money-saving.

However, the majority of sugar users in the use of portable blood glucose tester, or to master the necessary grass-roots knowledge, not only to know the truth, but also to know the reason why! For example, for the use of fingertip blood glucose measurement, the first drop of blood is accurate, or the second drop of blood is accurate, and so on, to do a good understanding of the problem.

The following is a discussion of the accuracy of different blood glucose measurement methods in the context of some of the questions asked by glucose users, and is for reference only.

First blood accurate, or second blood accurate?

First of all, the theory is that our body's blood glucose levels, which are bound to change accordingly over time, cannot be exactly the same; and not only do they vary over time, but they also vary depending on the different parts of our body where the blood is taken.

Therefore, the first drop of blood glucose measurement, a period of time, and then re-measurement of the second drop of blood, theoretically, the two data can not be exactly the same; and, with the longer interval, the difference in the value of the value will be greater, this is because our body is moving every moment, and every moment, we need to consume a certain amount of blood glucose.

Therefore, it is theoretically impossible for the first and second blood drops to measure the same blood glucose value; however, there is no question of who is more accurate between the two, as they both reflect our body's blood glucose levels at different moments in time.

Is finger glucose accurate, or is blood glucose accurate?

In addition to the above questions, there are also questions such as who is more accurate, finger blood glucose or blood glucose drawn from a vein.

As we know, blood glucose is measured in hospitals by taking a sample of blood from a vein in the arm, which means that the value of blood glucose measured by blood sampling reflects the value of blood glucose in the vein blood in our body.

Fingertip blood glucose is a blood sample taken at the tip of our finger, which is supplied from the heart through the arteries to the blood in the capillaries of our finger, which means that the blood glucose value measured at the finger is the value of blood glucose in the capillaries of our body.

According to the law of blood flow in our body, our capillary blood is going to contain a portion of blood that has been depleted of blood sugar.

Therefore, it is equally unlikely that our finger blood glucose is identical to the blood glucose drawn from a vein, but, again, there is no question of who is more accurate between the two, only that the blood glucose value in the vein blood is of more clinical value.

However, they all reflect blood sugar levels in different parts of the body.

To summarize: Theoretically, it is impossible for the blood glucose values measured by the first drop of blood and the second drop of blood to be exactly the same, but between the two, there is no such thing as who is more accurate, because they both reflect the blood glucose levels of our body at different moments.

Do you agree with me?

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Although nowadays blood glucose meters, electronic blood pressure monitors and other equipment to meet the requirements of patients at home to measure their own blood glucose, blood pressure, more convenient and faster, but after all, they are not professional, the instrument itself also has a certain degree of error, so many patients on the results of the test there is also a certain degree of skepticism. Facts have proved that there are indeed many patients in the blood glucose measurement, found that the results of each test are different, so it is also more puzzled.

When measuring blood sugar, is the first drop of blood accurate or the second drop?

Home self-testing of blood glucose are used rapid glucose meter, which is what we call blood glucose meter, in addition to supporting equipment and blood glucose meter with matching test strips, needles, blood pens, alcohol, cotton swabs and so on. This is done by taking fingertip blood. Therefore, taking fingertip blood is the key step in measuring blood glucose. On the premise that the blood collection method is standardized, many patients may still be confused about whether to take the first or the second drop of blood. In fact, neither the guidelines nor the experts have given a clear-cut answer at this point. In other words it varies from person to person.

• If your finger is clean, sterilized with alcohol and evaporated cleanly, it is perfectly fine to take the first drop of blood for blood sugar! If you go back and take a second drop of blood, instead, the tissue fluid will be squeezed out due to squeezing and the blood will be diluted, interfering with the results!
• If your finger is not clean, sterilizing it with alcohol may cause residual alcohol and dirt to mix with the blood and interfere with the measurement. This is when taking a second drop of blood is more accurate!

In fact, a relevant study has been conducted by a professional organization on this point. The results found that, under the premise of formal operation, the use of the first drop or the second drop of peripheral blood, the difference in measurement results is not statistically significant. Therefore, there is no need to be obsessed with the first drop or the second drop of blood for blood glucose measurement, the important thing is to ensure that the test method is correct. Our guidelines do not specifically emphasize the difference between first and second blood, but only provide guidance on the testing method. However, from a procedural point of view, in order to measure blood glucose more easily and quickly, it is best to use the first drop of blood, provided of course that the method is correct.

However, there have been research articles showing that measuring blood glucose with the first drop of blood is more accurate when the blood glucose is <10mmol/L, and that the second drop of blood is more accurate when the blood glucose is >20mmol/L. Of course, this is only relative and there is no clear guidance. As always, it's the method that counts, not the drop of blood.

For home self-testing of blood sugar, these things should be clear!

1, buy a suitable blood glucose meter: this is the most fundamental, blood glucose meter must be suitable for their own, must be able to operate it, the formal channels of purchase is guaranteed. In addition, the test paper should be matched with the blood glucose meter, the blood collection needle can not be utilized twice, the blood glucose meter should be cleaned regularly, calibrated and so on, these are the basic operational requirements.

2, wash your hands before measuring blood sugar: instead of obsessing over which drop of blood to take, wash your hands properly. Requirements before tying hands thoroughly washed, wiped clean, and then sterilized with alcohol, be sure to wait for the alcohol to evaporate clean and then blood collection.

3, blood collection method should be appropriate: before blood collection, you can make a fist several times, so that the blood flow, the depth of 2-3mm is appropriate, try to make the blood into blood beads when the needle, be careful not to squeeze the blood from the fingertip, so as not to dilute the blood, affecting the results. If one drop of blood is not enough, do not follow it with a second drop of blood, you should change the test strip and re-drop the blood. In addition, you should not press one finger to test, but change fingers frequently to collect blood.

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In the outpatient clinic to help patients tie their fingers for routine blood tests or blood glucose, some patients will always be blamed, "Why did you wipe off my first drop of blood without using it? That is not a waste of my blood, do you know that there is only one drop of blood in a bowl of rice". We try our best to explain to the patients that the result of the first drop of blood is not so accurate and the result of the second drop of blood is more accurate.

(doctor wipes patient's first blood)

For such an explanation, many people may have the feeling of half-belief and still think that this is a doctor's way of fooling him. So, when we measure blood sugar, is the first drop of blood accurate or the second drop of blood accurate? I will analyze the following to answer all the doubts.

First, let's let the leading experts speak, which should be convincing.In the 2016 Chinese Expert Consensus on Clinical Practice and Quality Management Standard for Portable Blood Glucose Meter, it is stated that when we use portable blood glucose meter to measure blood glucose, after skin puncture, press gently, wipe off the first drop of blood with a cotton ball, and then put the second drop of blood into the measurement area of the glucose test paper, and avoid squeezing excessively hard to avoid the bias of the results caused by the mixing of tissue fluid into the blood sample.。

As we can see from this guide, the results measured with the second drop of blood are more accurate than those measured with the first drop. This is because the first drop of blood may have been mixed with tissue fluid, which may have skewed the results.

Now, let me analyze the reasons for this with a little more expertise

When we measure blood glucose with a portable blood glucose meter, the skin of the finger is first sterilized, and after that the skin of the finger is pricked with a needle, and blood will come out with just a slight pressure. However, during this squeezing process, the tissue fluid in the tissue will be easily mixed in the first drop of blood when the skin is pierced, which will cause the first drop of blood to be diluted by the tissue fluid, and then it will cause the results to be a little biased, and the measured results may be less accurate.

But if we wipe away this first drop of blood and measure it with a second drop of blood, then we can avoid dilution by the tissue fluid so that the measurement is more in line with the accurate answer.

This is sometimes more difficult for those with rougher, thicker skin to collect blood from their fingers, especially the first drop of blood, which often contains more tissue fluid, and also should not be squeezed with force, which can cause more tissue fluid to be mixed into the blood.

In fact, despite what is said, many diabetics tend to measure their blood glucose at home with the first drop of blood, and very few of them will go to the trouble of wiping off the first drop of blood and use the second drop of blood. Although there are also related studies that show that there is actually no significant difference in the results of blood glucose measurement between the first drop of blood and the second drop of blood. HoweverWhen measuring blood glucose in the clinic, physicians still have to follow the operational guidelines to collect the second drop of blood for measurement. And it's best that we use second blood measurements as well for more accurate results.

Of course, when measuring blood glucose, we also need to pay attention to the following issues in order to have more accurate results:

1. Before measuring blood glucose, you should massage the end of the finger that needs to be measured, which can make the capillary blood flow of the fingertip sufficient, and facilitate smooth bleeding after puncture. Especially in the cold weather, it is more necessary to massage the fingers, otherwise, it will be easy to cause the blood is not smooth, they also suffer.

2. After sterilizing the cotton ball with alcohol, wait for the alcohol to evaporate before sticking the needle, so as to avoid the alcohol mixing into the blood, which may cause inaccurate blood glucose measurement results. In addition, after the alcohol evaporates, there are favorable blood into drops, not to the end of the finger scattered, flowing everywhere.

3. Before sticking the finger after sterilization, it is better to squeeze the blood towards the end of the finger with the thumb, and then use the thumb against the pressure, so that the end of the finger appears to be congested, and then stick the needle after that, so that it is easier to enter the needle as well as bleeding.

4. After fingertip blood collection and puncture, the fingertip should be gently squeezed to avoid over-squeezing, which may result in excessive tissue fluid mixing into the blood and ultimately affect the inaccuracy of the measurement results.

5. As the saying goes, ten fingers are connected to the heart, finger prick is very painful, especially when you have to do it yourself, so we should look for the pain is not so obvious that finger to prick. The peripheral nerves on the side of the tip of our ring finger are relatively speaking not so rich, and the pain is not so obvious, so now the ring finger to measure blood glucose, which is conducive to reducing the patient's pain and fear.

In conclusion, when using the terminal blood of the finger to measure blood glucose, we must ensure the accuracy of our blood glucose, and we should also learn how to reduce our pain, learn to get a single shot, avoid a second needle, and reduce our fear.

Author's note: I'm very happy to popularize health-related knowledge for everyone, I'm left-handed to say medical, every day in simple language for you to popularize professional medical knowledge, the code word is not easy, if you like my article, help me to point a praise! If you still have questions, you can leave a message in the comments section, welcome to pay attention to, forward, thank you for your support!

(Contributed by: Dr. Koko, Department of Laboratory Medicine)

When doing blood glucose measurements in diabetic patients in the outpatient clinic, it is necessary to collect finger blood, and occasionally patients will question: why waste my first drop of blood and squeeze another drop before doing the measurement?

How do you answer this question of first and second blood? Why in the world did you lose the first blood?

I checked the relevant guidelines and found that in the 2016 Chinese Expert Consensus on Clinical Practice and Quality Management Standard for Portable Blood Glucose Meter, there is this expression: after skin puncture, press gently, wipe off the first drop of blood with a cotton ball and then put the second drop of blood into the measurement area of the blood glucose test paper, and avoid overly forceful squeezing so as to avoid the tissue fluid mixing into the blood sample to cause the result to produce a bias.

The guidelines clearly stated that to avoid tissue fluid mixed with the sample, resulting in inaccurate measurement. Of course, it is better to trust the book than no book, although the guidelines say so, but in clinical practice, there are individual elderly, young children have difficulty in collecting blood, can successfully collect the first drop of blood, it is also acceptable, there are relevant studies have shown that the first drop of blood and the second drop of blood glucose measurement value does not have a significant difference, so in clinical practice, the collection of the second drop of blood as a standard, in special circumstances, you can use the first drop of blood blood glucose measurement.

So what should you look for when measuring your blood sugar?

1. Before measuring blood glucose, you should clean your hands, keep your fingertips clean, don't scratch things or have stains on the surface, which will contaminate the blood and react with the reagents on the test strips, resulting in inaccurate blood glucose, and don't use hand sanitizers with disinfectant ingredients to clean up, just wash with soapy water or clean water.

2. Before measuring blood glucose, especially in winter, when the temperature is low, rub your hands properly so that the blood flow in the capillaries of the fingertips is sufficient, and after puncture, it is easy to collect blood.

3. After sterilizing the alcohol cotton ball, wait for the alcohol to evaporate before collecting blood, or use a dry clean cotton ball to wipe the alcohol clean before collecting blood, so as to avoid the alcohol mixing into the blood, resulting in inaccurate blood glucose measurement.

4. When collecting blood from the fingertip, after puncture, if the blood can not be collected smoothly, gently squeeze the fingertip to avoid excessive force to squeeze out too much tissue fluid mixed into the blood, resulting in inaccurate blood glucose measurement.

5. Generally, blood is collected from the tip of the ring finger, as the peripheral nerves on the side of the tip of the ring finger are relatively less abundant and the pain is less obvious, which is conducive to alleviating the patient's fear and pain.

6. Blood glucose monitoring in diabetic patients, is a dynamic process, pay attention to regular checks or daily checks of blood glucose, accurate detection of blood glucose levels is conducive to guiding the use of medication in diabetic patients.

　　Blood glucose monitoring is an important part of diabetes management, and people with diabetes can keep track of their blood glucose levels at any time during their daily lives. The biggest concern in daily blood glucose monitoring is whether the test results are accurate. This also involves the question of whether the first or second drop of blood is accurate when measuring blood glucose.

　　1. The second drop of blood is more accurate because there is often dirt on the finger, and alcohol should be applied before sticking the finger, and the possible residual alcohol will have a chemical reaction with the blood and affect the accuracy of the result. Therefore, the first drop of blood should be wiped off, and the naturally flowing second drop of blood should be chosen to measure the blood glucose value. This is one of the most used methods in clinical practice.

　　2. The first drop of blood can also be used if the patient is thin, the amount of bleeding is small each time, and if it can be ensured to be sterilized cleanly and left to dry naturally. This is because, if the first drop of blood is wiped, the second drop of blood may be very small, and it is inevitable that the finger will be squeezed too much or too hard, resulting in tissue fluid being squeezed out at the same time and diluting the blood, which will lead to low blood glucose measurements.

　　In summary, the first drop of blood can be used without generally affecting the monitoring results, provided that the alcohol disinfection is completely evaporated or the soapy hand washing is completely dried. If the second drop of blood is used, it does avoid the influence of alcohol and sugary substances that have not completely evaporated on the blood glucose value. In addition, you must pay attention to clean your hands before taking blood glucose, you can use soapy water to clean the area taken, and then use a dry cotton ball alcohol sterilization to avoid infection. If you need to monitor the fasting blood sugar, you can't eat before measuring blood sugar, and you should ensure enough sleep the night before measuring blood sugar, avoid emotional excitement, physical exertion, strenuous exercise and other situations, so as not to affect the determination of blood sugar.

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Measuring the fingertip blood glucose value, using the first drop of blood or using the second drop of blood will not have much effect on the measurement. So, if you are not conducting a scientific study, but just for daily monitoring, you can use both. Here's what to do when it's better to use which drop of blood.

1. Before measuring blood glucose, it is required to wash and dry the hands, and at present, many people also use alcohol to sterilize and dry. If the above two methods are followed, then it is perfectly fine to use the first drop of blood. If the hands are not washed or dried beforehand, it is best to use the second drop of blood in order to prevent contamination.

2, according to the operating habits and speed selection. If the operation of the blood glucose meter first take out the test strip, ready or inserted, and then immediately after the finger prick, the whole process is very skillful, the time is very short, with the first drop of blood can be. If it takes more than 15 seconds from the time of finger prick until the completion of the step of "dropping the blood from the fingertip onto the test strip", then the first drop of blood has been in contact with the outside world for too long, which may affect the results of the test, so the second drop of blood can be used. When collecting the second drop of blood, which often does not flow out automatically, it can be pushed from the root of the finger to the tip of the finger to avoid localized excessive pressure on the tip of the finger.

3. Practice makes perfect. Encourage patients to experiment on their own. Every time you measure the fingertip blood glucose at the same time to measure the blood glucose of the first drop and the second drop of blood, to see if there is a big difference in terms of individuals. This will give you an idea.

Fingertip vein blood glucose measurement seems simple, in fact, there are still detailed requirements, otherwise it will affect the measured data, which in turn affects the medication situation, we share his specific method below.

The correct way to collect blood blood can not be squeezed: in the process of blood collection, excessive massage and force to squeeze the needle site, which will not only squeeze out the blood, but also squeeze out a part of the skin tissue fluid, the blood specimen caused by dilution, so that the blood glucose test results are low.

The correct method of blood collection is to choose the thinner skin on both sides of the fingertip, because the sides of the finger are rich in blood vessels and have fewer nerve endings. Blood collection in this area is not only painless but also adequate bleeding, and the results will not be affected by insufficient bleeding. Before blood collection, you can lower your arm for 10~15 seconds to make the fingertip congested, and after the needle is inserted, gently push the blood vessels on both sides of the finger to the anterior one-third of the finger, so that the blood will slowly spill out, and discard the first drop of blood to use the second drop of the most appropriate. If you choose to take blood in the middle of the finger is very painful, but not too close to the edge of the nail, so it is not easy to disinfect, not good to squeeze the blood. Blood point can be selected in ten fingers in rotation, most people choose in addition to the thumb of the remaining eight fingers. Before taking blood, you can wash your hands with warm water and hang down your arms, which can make the blood vessels of your fingers full and easy to collect blood. Precautions and disinfection methods for blood collection Skin preparation of the fingers before the test is recommended to wash the fingers with warm water and soap, or to disinfect them with alcohol swabs, both methods are possible. But no matter which method must remember: the finger must be in a dry state to take blood, that is to say, warm water and soap cleaning to cool dry fingers, alcohol sterilization to wait for the alcohol to completely evaporate before using the blood pen to pierce the finger, to ensure the accuracy of the measurement.

It should be emphasized that iodine-containing disinfectants (e.g., iodophor, iodine) should not be used to disinfect the skin. The iodine in iodine and povidone iodine can react with the enzymes in the blood glucose test strips and produce errors. Blood glucose meter should be noted during the test, try to be at room temperature; avoid placing the instrument near electromagnetic fields (such as cell phones, microwave ovens, etc.); the amount of blood collected should not be too much or too little. With the precautions of the blood glucose meter, each brand of blood glucose meter has its own function and unique operation method, the new blood glucose meter first do not rush to operate, be sure to carefully study the instructions to understand the characteristics of the product to master, learn the correct use of the method. I hope my sharing can bring you help!