Should I use the first drop of fingertip blood or the second drop of blood?

Self-monitoring of blood sugar is an important part of comprehensive management and treatment of diabetes. Especially for people with diabetes who use insulin, self-monitoring of blood sugar is generally required throughout their lives.

 

Researchers once observed the blood sugar measurements of 123 diabetic patients under different circumstances: such as touching fruits without washing hands and under different pressures. It was found that the first drop of blood after washing hands should be used; if hands are not washed, contact with sugary substances or stress should be avoided, and the second drop of blood should be used. The Endocrinology Department of the First Affiliated Hospital of China Medical University monitored the first and second drops of blood and compared them with venous blood values. It was observed that when there is no mandatory requirement on whether to wash hands or not, as long as 75% alcohol disinfection is carried out in a standardized manner, it can pass The rapid blood glucose meter can still accurately measure the actual blood glucose value, which meets the standards of GB/T19634-2005 (the difference is within 20%), and there is no significant difference between the measured values ​​of the first drop of blood and the second drop of blood. . It can be observed that when the blood sugar level is 10-20mmol/l, there is no significant difference between the first drop of blood and the second drop of blood and the venous blood value. When the blood sugar value is low or high, when the blood sugar value is lower than 10mmol/l, the first drop of blood The measured value of one drop of blood will be 0.1-0.3mmol/l higher than the actual venous blood glucose value, and the measured value of the second drop of blood will be 0.4-0.5mmol/l higher than the actual blood glucose value. On the contrary, when the blood glucose value is higher than 20mmol/l, the measured value of the first drop of blood will be 1.3-1.6mmol/l lower than the actual venous blood glucose value, and the measured value of the second drop of blood will be 0.6-0.9mmol/l lower than the actual venous blood value. .