Thursday, June 25, 2020

Can I drink water before the medical examination?

Can I drink water before the medical examination? Yes, but it’s about 200ml.

Generally, people who come to make an appointment for medical check-ups will be told that they cannot eat after 8pm on the first day and cannot drink water after 12pm. Normal physical examinations are usually arranged in the morning. There are many people who come to the hospital for medical examinations and need to queue up. Sometimes they will be arranged at 11 or even 12 o'clock. If they do not eat in the morning because of the medical examination, some people can still withstand, but one I don’t drink water in the morning, I think many people are unbearable. In fact, the idea that drinking a glass of water normally affects the blood test is wrong. Our human body is running at all times, and its operation is inseparable from water. Therefore, it is correct to drink some water. In the early morning of the medical examination, you can drink about 200 milliliters of water (a cup of ordinary size water) after getting up, which will not affect the results of the medical examination.

Some people have a wrong understanding of blood tests for medical examinations, thinking that drinking water before the test will dilute the substances in the blood. For example, drinking water will dilute the red blood cells and detect anemia. Is this really the case? Think about it. Under normal circumstances, we have enough water supply. If we don’t drink water in the evening and then in the morning, then our body will be in a state of water shortage, and the blood is really not Dilute, but it will be concentrated, then the result of the inspection may be high. Even if all the water we drink enters the blood, our normal people's blood is about 5L, plus 200ml of water, its dilution effect is very small, not to mention that only a small part of the water we drink remains in the blood. In the early morning of the medical examination, you can drink 200 ml of water (a cup of ordinary size water) after getting up, which will not affect the results of the medical examination. Drinking water is also necessary to participate in the body's metabolism and be absorbed, and will be excreted through the urine and breathing sweat. The impact of a glass of water on the body is very limited.

However, it must be noted that drinking a lot of water still has an effect, and it is appropriate to drink a glass of normal water. It is not advisable to drink sugary or alcoholic beverages. Milk and other high-protein and high-fat beverages are also not suitable for drinking. Just drink plain water. Especially when you need to check blood sugar, drink sugary drinks on an empty stomach, blood sugar will rise.

Tips: It is assumed that drinking water before the test will dilute the substances in the blood. For example, drinking water will dilute the red blood cells and detect anemia. This assumption is wrong. But remember to not eat, drink water is also boiled water, and the amount should not be too large, preferably within 200ml.

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