Can I drink water the night before the physical examination?

Many people will consult their doctors before a physical examination whether they can drink water or not. This is because many things need to be paid attention to in order to correctly meet the requirements of the physical examination. In fact, the question of whether or not you can drink water before a physical examination has a lot to do with the items to be done in the physical examination. So let’s take a look at whether we can drink water the night before a physical examination?

If you are checking liver, kidney function, blood lipids, blood sugar, etc., it is best not to drink water before the physical examination, so as not to affect the accuracy of the physical examination results. If you drink 200 ml of water on the morning of the physical examination, it will take at least half an hour to get from home to the physical examination center and then to the full body scan. By this time, the water you drank has already been absorbed and has penetrated into the tissues to participate in metabolism. During this half hour, 20-40 ml of urine will be produced, and some of it will be excreted through breathing and sweating. Therefore, the increase in your blood volume at that time would not exceed 40 ml, which is less than 1%, and it would not have any impact on blood indicators.

Almost everyone knows that checking liver and kidney function, blood lipids, blood sugar, etc. requires the examinee to fast, because the human body is in a relatively basic metabolic state at this time, which can reflect the real situation. Drinking a lot of water before a physical examination will indeed dilute the blood, leading to errors in the test values ​​of blood sugar, blood lipids, blood viscosity, etc.

In fact, it is okay to drink a small amount of water (50-100 ml) on the morning of the blood test or the night before. As long as you don't gulp down water or drink hundreds of ml at a time, it will not affect the results of the physical examination. Therefore, patients with hypertension and diabetes do not have to skip medication before a physical examination because they are afraid to drink water. Instead, taking medication before coming for a check-up can help doctors understand their daily physical condition so that they can adjust the treatment plan. However, it should be noted that drinking soy milk, milk, etc. on an empty stomach can cause gallbladder contraction and abdominal bloating, affecting abdominal B-ultrasound results; drinking sweet drinks may cause blood sugar test values ​​to be high.