Venous blood and finger blood tests differ in the amount of blood collected, the accuracy of the test, and the laboratory items. 1. Blood volume: venous blood is mainly taken from the middle vein of the elbow, and the volume of blood taken from the vein for routine blood test is usually 2~4 ml. The volume of venous blood collected for routine blood tests is usually 2~4 ml, while finger blood is usually taken from the tip of the ring finger, and the volume of blood collected is relatively small, a few drops can be taken. 2. Detection accuracy: Although finger blood is convenient and quick to operate, the accuracy is low, and it will be affected by the operation of personnel, hand temperature and other aspects; while venous blood is affected by human factors, the results of the test are relatively more stable and accurate, and if there is a difference between the results of the venous blood and the finger blood, the results of the venous blood will generally prevail. 3. Laboratory items: In addition to routine blood tests, finger blood tests are applied to fewer items, mostly used for blood glucose and routine blood tests; while venous blood is more widely used, in addition to routine tests, it can also be used for liver function, renal function and electrolyte tests. Clinical should choose venous blood or finger blood test routine under the doctor’s advice.