Once water enters our digestive system, it will be absorbed and excreted very quickly. Therefore, the water drunk in the stomach will be quickly absorbed into the blood before blood drawing, and the blood will be diluted in this way, which will affect the blood substance concentration and the accuracy of the test results.

So be sure to consult a doctor before the physical examination. According to the doctor's specific requirements, you can't make your own decisions. It is generally recommended to take blood on an empty stomach to avoid errors in body metabolism and lead to misjudgment. Therefore, do not drink water before the physical examination, and draw blood on an empty stomach to obtain accurate physical examination values.

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