This is a question of great concern to many diabetics. To understand the answer to this question, it is important to discuss two aspects:
1 Are finger blood and venous blood glucose levels the same?
1 Tying the fingers for blood collection obtains whole blood in the capillaries and veins take venous blood. Theoretically, there is a difference in blood glucose levels between these two parts of the body.
As arterial blood flows through the capillaries, the tissue cells within the microcirculation have to ingest and utilize glucose, so in general, arterial blood glucose levels are slightly higher than venous blood. Blood glucose levels in capillaries are close to those of arterial blood, so they are also slightly higher than venous blood glucose levels.
During fasting, the difference between the two blood glucose levels is not obvious. But after a full meal, the difference becomes visible.
2 Sending venous blood to the laboratory for measurement of blood glucose levels also depends on the method of measurement.
Using venous whole blood, venous plasma, and venous serum, the values are different. Generally, venous plasma measures the same as venous serum, but slightly higher than whole blood (because of the volume occupied by blood cells).
In fact, the range of normal values varies from one method to another. See the table below:
Currently, the criteria for diagnosing diabetes mellitus are set by venous plasma measurements, which is the method used in most hospital laboratories.
II Which is accurate, the rapid glucose meter for finger blood collection versus the specialized equipment in hospital laboratories?
There is no doubt that the accuracy and reliability of hospital lab equipment is higher than that of home glucose meters. Hospital equipment also has the inherent advantage of being subjected to mandatory calibration on a regular basis, which also ensures higher accuracy and reliability. But that's not to say that home rapid glucose meters are any less accurate. The accuracy of blood glucose meters sold through national certification is still guaranteed. It is absolutely sufficient for general use.
The equipment is good, no correct operation method is not. Sometimes encountered rapid glucose meter measurement results are not stable, it is likely to be human factors interference. For example, blood glucose test strips are out of date, improperly stored oxidized, finger skin is not dry, excessive force squeeze, insufficient blood collection, etc., may make the test results inaccurate. Blood samples sent to the laboratory for examination can also affect the results if they are not stored properly and kept for too long.
Summary:
Overall, the results of venous blood collection are relatively more accurate and reliable. However, the results of finger-peripheral blood tests do not differ much, and are adequate for guiding daily blood glucose control. Instead of being obsessed with which value is more accurate, we should pay more attention to whether the operation method is standardized when checking the fast blood glucose in daily life.
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What is the difference between venous and fingertip blood glucose? Which one more accurately reflects our blood glucose levels?
At present, there are about 100 million diabetic patients in China, and for them, blood glucose monitoring is very important, because through blood glucose we can know how well the blood glucose is controlled. If you find that the blood sugar control is not good, you can always adjust the medication. Today I will share the knowledge about measuring blood sugar.
1. The value of venous blood test is accurate:
The precision of the instrument: Generally speaking, the instrument for detecting blood biochemical routine is more precise in the manufacturing convenience, mainly to reduce the error, and to provide more accurate data to the clinical front-line doctors. And we commonly used fingertip blood glucose meter, some small manufacturing plant is also able to produce, the middle of the existence of error, each manufacturer error varies. There is also a convenient is a small blood glucose meter to be calibrated every once in a while, some people use for a long time without calibration, over time the error will increase.
The blood glucose detected in venous blood is the removal of white blood cells, red blood cells, can be said to be the plasma glucose concentration: while the fingertip of the needle blood is the blood in the capillaries, in the peripheral end of the circulation, the mobility is not as good as the venous blood, and at the same time contain white blood cells, red blood cells, etc., so fingertip glucose may be with the venous blood have a certain degree of difference. The doctor relies on the venous blood glucose results when making a diagnosis.
On the use of home blood glucose meter: First of all, the fingertip disinfection-needle prick-blood outflow-detection, should be in line with the above a set of ways to be correct, but disinfection should be to wait for the alcohol to evaporate, otherwise the blood just out of the blood because of the mixing of the alcohol will be diluted, affecting the results. Otherwise, the fresh blood will dilute and affect the result because it is mixed with the alcohol. Also, the blood should be allowed to flow out naturally, not squeezed, as squeezing can cause the red blood cells to rupture and mix with the glucose outside the red blood cells, which can also affect the results. Overall, there is a difference between venous blood glucose and fingertip glucose, and venous blood glucose is more accurate.
2. So why do we recommend fingertip glucose testing if it is not accurate?
This has to do with the fact that our country has a large population, and it is not possible to queue up at the hospital every day to test blood glucose, which requires a lot of manpower and resources. The home blood glucose meter solves this big trouble, convenient and quick advantages for people with abnormal blood sugar. If the physical examination found abnormal blood sugar, it is recommended to the hospital venous blood sampling review, multiple checks to see if there is a problem; and for diabetic patients can not go to the hospital every day to draw blood, you can choose a blood glucose meter, test the blood sugar pattern, convenient and timely adjustment of medication. For example: a normal person's venous blood test suggests 6.0 mmol / L (normal fasting blood glucose value of 3.9-6.1), glucose meter test suggests 6.12, can qualitatively think that the person's blood glucose abnormalities?
This is incorrect, need to use venous blood as the basis for diagnosis, this little error may make a person with high blood sugar disease. And diabetic patients assume that the morning fasting fingertip blood glucose 7.5moml / L, venous blood sampling shows 7.4, before lunch fingertip blood glucose 6.8, 2 hours after the meal 11.0, and venous blood before the meal 6.7 2 hours after the meal 11.2; the overall blood glucose bias, a little bit of error does not affect the amount of this person's medication at all, the use of home use is more convenient some. So venous blood glucose testing is more accurate, but not everyone's first choice.
The last summary: our medical blood glucose refers to venous blood glucose, and fingertip blood glucose response is only capillary blood glucose, which is mainly used to determine the changes in blood glucose, and can not be used to diagnose diabetes, so venous blood glucose is more accurate to our blood glucose level. Purely hand-typed, it is not easy, if you think the writing can also be rewarded a praise, point a concern, if you have any questions you can leave a message below ......
Blood glucose measurement is an indispensable measure for the diagnosis of diabetes, but also one of the necessary steps in the process of diabetes management. But what's the difference between venous blood glucose and fingerstick blood glucose? Venous blood glucose is collected from the large vein at the elbow, the blood drawn in the blood tube is centrifuged, the blood cells in the blood are deposited at the bottom of the blood tube, and the serum from the upper layer is taken to test the glucose concentration, which is a more accurate reflection of the blood glucose level in the body. Intravenous blood glucose is highly accurate, but it needs to be tested in the hospital, which is inconvenient and not suitable for long-term self-vascular monitoring and management of diabetic patients.
Venous blood glucose must be measured for the diagnosis of diabetes and cannot be replaced by fingerstick blood glucose.
Interfinger blood glucose, which measures blood glucose levels in whole blood, is typically about 10-20% lower than venous blood glucose. Although inter-finger blood glucose levels may be about 10-20% lower than internal blood glucose levels, it is easy to perform and can be done at home, making it more suitable for long-term self-monitoring of blood glucose in diabetic patients.
There are two types of blood glucose monitoring, each with its own advantages and disadvantages. Intravenous blood glucose is more responsive to real blood glucose, but its operation is complicated and inconvenient, which restricts its widespread use, while interphalangeal blood glucose is easy to operate, and the difference in value is within the acceptable range when compared to venous blood glucose, which is why it has been widely used.
Venous blood glucose is more accurate
Both can, on the basis of finger blood glucose plus one or two millimolar into, what people can not go to the hospital every day to draw blood? And finger blood glucose can be taken several times a day.
Venous blood is relatively accurate, but you can't draw it every day. If you look at your fingertip blood, there's not much difference between the two, provided the machine and the strips work