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Some netizens accidentally cut the thigh and bleeded, so they measured a blood sugar by the way. Is this an accurate measure of blood glucose compared to blood in the fingertips? What else should I pay attention to when measuring blood glucose?
Cai Song, director of the Department of Endocrinology at Beijing Longfu Hospital, said that whether it is finger blood, toe blood or blood from other parts of the body, there is definitely a difference between the blood glucose value measured by venous blood and venous blood. The blood glucose meter is generally measured with the blood on the ends of the finger, and the value is corrected with the measurement value of the venous blood. If you use blood from other parts, there is no corresponding correction, or according to the corrective value of finger blood, there may be a certain deviation, "this deviation is generally relatively small, is acceptable." "Diagnosing type 2 diabetes requires a diagnosis with venous blood. After the diagnosis of diabetes, do daily monitoring, understand blood sugar changes, and use peripheral blood, which is relatively simple and convenient.
Cai Song introduced that the measurement value of the blood glucose meter is affected by many factors, such as the temperature of the hand, the amount of blood, and the measurement value of different fingers at the same time may not be exactly the same. If the patient's blood glucose is usually not too high, below 10 mmol/L, the measured values of the first and second drops of blood are basically the same. If the patient's blood glucose is particularly high, exceeding 20 mmol/L, the first drop of blood may be low, and the second drop is more accurate.
"There are five time points for blood glucose measurement, namely on an empty stomach, two hours after three meals, and before bedtime. If the blood glucose fluctuates too much, type 1 diabetes, and patients at particular risk of hypoglycemia, it is recommended to add 2 additional time points, that is, before lunch and before dinner. If hypoglycemia is prone to occur at night, add another measurement time point, that is, 12 o'clock at night. Cai Song stressed that it is not advocated that patients over-measure, if premixed insulin is played, the principle of measurement is generally to measure twice a week, including fasting and two hours after dinner, the day before the hospital to check, test 1 time 5 time points, basically this month's situation doctor can understand.
In addition, Cai Song reminded that the use of a blood glucose meter to measure blood glucose should pay attention to the following points:
Save the test strip
Dipsticks have a shelf life, and if they are not well preserved, they may oxidize and affect the measurement results. It is best to buy individually wrapped test strips to reduce measurement errors caused by possible oxidation or long time. In addition, if the results are not measured using this test strip, be sure to change a new test strip, and cannot continue to drip blood on this basis.
Disinfect with 75% alcohol
Disinfectants containing iodine agents react with oxidase on test strips, resulting in high test results. Therefore, it is recommended to use 75% alcohol disinfection when collecting blood, and to wait for the alcohol to be completely volatilized before testing, so as to avoid the alcohol reacting with the chemicals on the test strip and causing inaccurate blood glucose values, and the injection before the alcohol is completely volatilized will increase the pain.
Avoid squeezing the blood vigorously
When collecting blood, if you squeeze the blood hard, more tissue fluid will be squeezed out, resulting in a low measured value. Therefore, squeezing the blood and massaging the fingertips excessively should be avoided. Natural outflow can better ensure the accuracy of blood glucose measurement. If the natural outflow is slow, squeeze from the root of the palm to the fingertip, not the needle.
Beijing News reporter Liu Xu
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