In principle, depending on the morning blood test program, it is divided into two cases: you can drink water and you can’t drink water. The specific requirements are different according to different checking items and should be carried out under the professional guidance of doctors. However, in order to ensure the accuracy of the test results, it is recommended to collect blood on an empty stomach. If the test items are fasting blood glucose, blood routine, liver function, kidney function, blood lipids, uric acid and other tests need to fasting, no water. Drinking water will dilute the blood, and the values in the blood test will be lower than normal. Drinking water will also increase the blood glucose, resulting in inaccurate blood glucose test results. Liver function, aminotransferases, and other test results are also affected. If the test items are D-dimer, Hepatitis B V, etc., fasting is not required, and drinking water has no effect on the test results.