How many milliliters does voluntary blood donation need?

According to China's "Blood Donation Law", the amount of blood collected by a blood donor at a time is generally 200ml, and the maximum amount shall not exceed 400ml. The interval between the two collections is not less than six months, so donating 200-400ml of blood at a time is harmful to the health.

Precautions for blood donation:

First of all, before donating blood:

In order to ensure the health of blood donors, the Standard for Health Examination of Blood Donors stipulates that blood donors must do the following physical examinations:

1. Check age: The age suitable for blood donation is 18-55 years old.

2. Weight: not less than 50 kg for men and not less than 45 kg for women.

3. Blood pressure: systolic blood pressure12-20kPa (90-150mmhg); The diastolic pressure was 8- 12 kPa (60-90mmHg), and the pulse pressure difference was greater than 4 kPa (30mmHg).

4. Pulse: 60- 100 beats per minute, and 50- 100 beats per minute for high endurance athletes.

5. The temperature is normal.

6. Normal development and moderate nutrition.

7. The skin has no yellow staining, no wound infection, no extensive dermatosis, and no obvious swelling of superficial lymph nodes.

8. There is no serious disease in the five senses, no yellow staining in the sclera and no goiter in the thyroid gland.

9 limbs without serious disability, joint swelling and dysfunction.

10. Chest; Heart and lungs are normal.

1 1. Abdomen: normal, without lump, tenderness and hepatosplenomegaly.

Two, blood donors blood test items:

1. Blood specific gravity screening, copper sulfate method: male is greater than 1.052, female is greater than 1.050.

2. Blood typing: ABO blood type must conform to the positive and negative typing. Rh(D) stereotypes should be carried out in areas with conditions or high RH negative rate.

3. Liver function test: Alanine aminotransferase activity is taken as an index, which should be less than 25 units measured by Wright's method. If the index is unqualified, it is not suitable to participate in blood donation, but it does not mean that there must be something wrong with liver function.

4. Examination of blood infectious diseases: serological examination of hepatitis B virus surface antigen, hepatitis C virus antibody, HIV antibody and syphilis. Anyone who tests positive may not participate in blood donation.

Three, blood donation matters needing attention:

1. It is best to bring your ID card, temporary residence permit, driver's license, social security card, soldier's card, soldier's card, passport and other identification before donating blood.

2. Do not eat high-fat or high-protein foods, such as fat, fish, fried dough sticks, etc. Two meals before blood donation. Prevent blood turbidity.

In the morning, you should eat some light food, such as porridge, steamed bread, bread, eggs and so on.

4. properly replenish water to ensure that the blood is not too sticky.

Don't be nervous before donating blood, and keep relaxed and happy. You should know that healthy people donate blood in moderation according to regulations, which has no effect on the body, so don't worry.

6. Go to bed early the night before blood donation to ensure adequate sleep.

7. It is best to take a bath and put on clean underwear, especially elbows, before donating blood.

8. Don't drink on the day before and on the day of blood donation.

9. At the blood donation site, we should follow the guidance of medical staff to ensure that the whole blood collection process is carried out in an orderly manner.

10. Give priority to vegetarianism a few days before blood donation, eat less greasy food, and don't eat foods that are too high in protein. This is to ensure the quality of blood and avoid allergic substances in blood.

1 1. Eat breakfast before donating blood. Keep a good sleep the night before blood donation and don't do strenuous exercise. If you have symptoms such as cold, fever and cough two days before blood donation, you should suspend blood donation; Women should avoid donating blood during menstruation and three days before and after.