Generally speaking, fingertip blood glucose may be slightly higher than venous blood glucose, but the error is not significant. 1. Fingertip blood glucose: mainly measures blood in capillaries, generally used for daily monitoring of diabetic patients’ blood glucose value, convenient and easy to operate. 2. Venous blood glucose: mainly measures the blood in the veins, mainly used for diagnosing diabetes and regular review. Because blood is constantly flowing and there are fewer sugars and other nutrients in venous blood than in fingertip blood, blood glucose values will be slightly different, especially for postprandial blood glucose. Generally speaking, fingertip blood glucose will be slightly higher than venous blood glucose. Meanwhile, if the blood glucose meter is of a different model, in a different environment, or with a different operation technique, the measured value may also be slightly different. If patients find that their blood glucose values are abnormal, they should go to the hospital in time to avoid delaying their condition.