If fingertip blood glucose is 6.4 mmol/L 2 hours after a meal, venous blood glucose is usually about 6.4 mmol/L, with an error of about 0.1; if fasting, fingertip blood glucose is 6.4 mmol/L and venous blood glucose is about 7.2 mmol/L. In the fasting state, fingertip blood glucose, which is also known as peripheral capillary blood glucose, is usually about 12% lower than the laboratory-measured venous blood glucose. However, after a meal or soup, fingertip glucose is closer to venous plasma glucose. The results of fingertip blood glucose are easily interfered by various factors, such as dilution of the alcohol used to sterilize the fingertips, etc. It is not recommended to be used as a diagnostic criterion. If elevated fingertip blood glucose is detected, one should go to the hospital to have glycosylated hemoglobin and glucose tolerance test to check for related diseases. It is recommended to seek prompt medical attention when elevated blood glucose occurs.