Can I drink water and eat before physical examination? Precautions before physical examination

Physical examination is a very common thing in life. Regular physical examination will give you a better understanding of your physical condition, but there are many precautions before physical examination. I hope everyone will pay more attention. Let's get to know it together!

Can I drink water before physical examination? Yes, but in moderation, about 200ml.

Generally, people who come to make an appointment for a physical examination will be told that they can't eat after 8 pm on the first day, and they can't drink water after 12 pm. Generally, normal physical examinations are arranged in the morning. Many people have to wait in line when they come to the hospital for physical examination, sometimes 1 1 or even 12. If you don't eat all morning because of physical examination, some people can hold back, but don't drink water all morning. I think many people can't stand it. In fact, it is wrong to think that drinking a glass of water usually affects blood tests. Our human body is running all the time, and it can't run without water. So it is correct to drink some water in moderation. On the morning of the physical examination, you can drink about 200 ml of water (a cup of ordinary water) after getting up, which will not affect the physical examination results.

Some people have a wrong understanding of physical examination and blood test, and think that drinking water before examination will dilute the substances in the blood. For example, drinking water will dilute red blood cells and detect anemia. Is that really the case? Think about it. Under normal circumstances, we have sufficient water supply. If we don't drink water one night and one morning, then our body will be in a state of water shortage. The blood is not diluted, but it will be concentrated, so the test result may be high. Even if all the water we drink enters the blood, the blood of our normal people is about 5L, and with 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. On the morning of the physical examination, you can drink 200ml of water (a glass of water of normal size) after getting up, which will not affect the physical examination results. The water you drink has long been absorbed by participating in human metabolism and will be excreted through urine and sweat. The influence of a glass of water on human body is extremely limited.

However, it is necessary to pay attention. Drinking more water still has an impact, and drinking a glass of water normally is appropriate. It is not advisable to drink sugary and alcoholic beverages, and it is not advisable to drink high-protein and high-fat beverages such as milk. Just drink boiled water. Especially when blood sugar needs to be checked, drinking sugary drinks on an empty stomach will raise blood sugar. ?

Can I eat before the physical examination? No, it will affect the physical examination results.

People's blood pressure and laboratory indicators will change with people's activities, diet and other factors within 24 hours a day, especially within 2 hours after meals, blood sugar will increase, gallbladder will contract, and intestinal gas will increase after activities, which will affect the development of pancreas and kidney. These factors will affect the physical examination results, so the physical examination must be carried out in the morning and need an empty stomach.

The doctor told the patient to have a blood test on an empty stomach, not to let the patient be hungry, not to mention the test results after being hungry for more than ten hours. Because if the body is hungry, the number of functional indicators in the body will change, which will lead to the collection of blood samples different from usual. Therefore, even if the results of such tests are "normal", they cannot accurately reflect the real situation of patients.

Hunger has a particularly obvious impact on diabetic patients, because long-term hunger will lead to hypoglycemia shock, cold sweat and even fainting. Finally, it is necessary to inject or take glucose orally to get out of danger. Even if there is no shock, because the fasting time is too long, the blood sugar test result is very low, and it is easy to be mistaken for good blood sugar control, which not only harms oneself, but also misleads doctors. There are also some diabetics who are extremely sensitive to their own blood sugar regulation. When they are hungry for a long time, they will immediately mobilize their glycogen for emergency use. At this time, their blood sugar level is much higher than usual, and this result is incorrect, which will mislead doctors and add trouble to treatment. Therefore, diabetic patients must eat dinner overnight before testing fasting blood sugar.

So, what is an empty stomach? The specific requirements are: the night before blood drawing, patients should maintain their usual living habits and eat normally; Food should be light, don't drink; Don't drink coffee or strong tea after meals; Have a good rest. After getting up the next morning, don't eat breakfast, drink less or no water, don't do morning exercises, and wait calmly for blood collection in the hospital. Such a blood sample is a good sample to reflect the real situation. Some patients' triglycerides are so high that serum affects the accuracy of other blood ester test results like milk. At this time, the doctor will ask them to be vegetarian for a few days, not to eat fat, let the serum clear, and then do blood tests on an empty stomach.

Precautions before physical examination 1. You must maintain a normal diet within three days before the physical examination. You must not eat too greasy or high-protein food, and you must not drink alcohol. Pay more attention to rest and avoid fatigue, otherwise it will affect the physical examination results.

2. Fasting for at least 8 hours before physical examination, otherwise it will affect the examination of blood sugar, blood lipid and liver function. However, you can drink a small amount of water. For the drugs you usually take, you can temporarily stop taking them. If you must take it, you must inform the doctor during the physical examination.

3. Under normal circumstances, it is not appropriate to take medicine three days before the physical examination, and some drugs will affect the accuracy of the physical examination.

4. For routine blood examination, blood must be collected at the specified time, and the latest shall not exceed 10.00. If the blood is drawn too late, the physiological secretion of hormones in the body will be affected and the blood state will change. Although blood is still drawn on an empty stomach, the test value is easily distorted (such as blood sugar value) and the significance of the test will be lost.

5. In order to ensure that you know your physical examination results correctly after physical examination, you must fill in the physical examination form carefully, especially pay attention to clear handwriting and complete items.