The difference between fingertip blood glucose and venous blood glucose is generally about 15%, and fingertip blood glucose is generally considered to be lower than venous blood glucose. Fingertip blood glucose measures a mixture of arterial and venous blood glucose, which is easy to use and is mainly used for diabetic patients who need to monitor their blood glucose on a daily basis. Venous blood glucose measures glucose in venous blood and is mainly used to diagnose diabetes. In general, fingertip blood glucose is lower than venous blood glucose. In addition, fingertip blood glucose measurement is affected by many factors, such as not drying the fingertip with alcohol disinfection, squeezing the blood with force to squeeze out more tissue fluid, etc. These operations will make the fingertip blood glucose measurement inaccurate. If patients find abnormal blood glucose values, they should consult a doctor for a clear diagnosis and timely treatment under the guidance of the doctor to avoid delaying their condition.