Blood sampling for blood glucose is venous blood glucose, finger blood glucose is peripheral blood glucose, blood sampling and finger blood glucose values are usually different, mainly in the detection of different blood components and clinical role. 1. Different blood components: Finger blood glucose refers to glucose in capillaries, analyzing whole blood; venous plasma glucose is glucose in venous plasma. 2. Different clinical roles: fingerstick blood glucose measurement is simple to operate, mainly used for diabetic patients’ out-of-hospital self-monitoring of blood glucose as well as hospitalization during the medical care record of blood glucose, which is needed to understand the specific blood glucose of the patient in order to formulate and adjust the glucose-lowering program. Blood tests for glucose measurement need to be done in the hospital, and are generally used for confirming the diagnosis of diabetes and reviewing the control of blood glucose. It is recommended that patients who need to test their blood glucose do so under the direction of their doctor.