Can I drink water before the experience?

People will have a physical examination before joining the army or doing some work in the catering industry or other jobs with high hygiene requirements. The purpose is to ensure the health of the staff so as not to infect others with diseases. And those who have signs of illness will also have their bodies checked by physical examination. There are some taboos before the physical examination. So can you drink water before the experience?

Many people drink water and beverages, mainly worried about whether it will affect the test results of routine blood and urine tests during physical examinations. In fact, on the day of the physical examination, you can drink 200 ml (equivalent to half a bottle of mineral water) of boiled water after getting up in the morning, which will not affect the results of the physical examination.

The blood volume of our human body accounts for about 7-8% of body weight, so a person weighing about 60 kg has a blood volume of about 4200-4800 ml.

If you drink 200 ml of boiled water on the morning of your physical examination, it will take at least half an hour to get from home to the hospital and then to have your blood drawn. By then, 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.

The doctor emphasized: We are only talking about boiled water here. Drinking sugary drinks on an empty stomach will cause a sudden rise in blood sugar, especially within a few hours before blood drawing for a physical examination. Therefore, it is best not to drink sugary drinks to avoid affecting the results of the physical examination.

Before the physical examination

Other considerations

Three days before the physical examination

1. Understand in advance what the physical examination includes, ask the doctor in detail about the time and precautions of the physical examination, and avoid excessive mental stress.

2. Diet : Eat a light diet three to five days before the examination. Do not eat too much greasy or indigestible food, do not eat bloody foods such as pig liver and pig blood, and do not drink alcohol. Do not eat after 8:00 pm the day before the examination.

3. Activities: Pay attention to rest the day before the physical examination, avoid strenuous exercise and emotional excitement, and ensure adequate sleep to avoid affecting the results of the physical examination.

4. Medication : Do not take vitamin C, diet pills and antibiotics 3 days before the physical examination.

However, patients with chronic diseases such as hypertension and coronary heart disease who are receiving antihypertensive, anticoagulant and antithrombotic treatments should not rashly stop or postpone taking medications, especially retired employees, to avoid the dangers of sudden increase in blood pressure, coronary ischemia, etc. They should take the medications in the early morning before undergoing a physical examination.

Patients with diabetes or other chronic diseases should also take medication in a timely manner after blood drawing, and should not allow the physical examination to affect the routine treatment of existing diseases.

5. Gynecological examination: Women during menstruation and unmarried women should not undergo gynecological examination and urine test. Married women of childbearing age must determine whether they are pregnant before a physical examination. They must not take any medicine, wash, or have sexual intercourse 24 hours before a cervical smear test.