The most accurate results of the glucose tolerance test must be obtained by taking venous blood from a hospital. Because hospitals use large and precise biochemical instruments to measure blood glucose, the results are very accurate and the conclusions drawn are reliable. Fingertip blood glucose is mainly used for patients to monitor blood glucose at home with fingertip blood glucose meter, which can be used as a reference for adjusting glucose-lowering treatment, but the results of the measurement cannot be used as a basis for diagnosing diabetes. However, the results of the measurement cannot be used as a basis for diagnosing diabetes, because the blood glucose measured by fingertip glucose meter has deviation and the results are not stable. Therefore, if a patient wants to confirm the diagnosis of diabetes by performing a glucose tolerance test, the test should be performed by drawing venous blood. For diabetes glucose testing at home, fingertip glucose meter monitoring is sufficient.