How many milliliters can a person donate blood at most?

All citizens who meet the criteria for health examination of blood donors donate 200-400 ml of blood each time, accounting for only110-proved by blood donation practice. 1/20 will not affect health. This conclusion has scientific basis and has been proved by the practice of tens of millions of people donating blood all over the world.

You may be asking how much blood each person can donate at most.

A man named james harrison is 67 years old. It has been 49 years since he 18 years old. 5 1 year, he went to the blood donation station 480 times and donated 480 liters of blood. This is equivalent to 1200 cans of Coca-Cola. The total blood volume of an adult man generally does not exceed 3.5 liters.

Preparation before blood donation

If you pass the health examination and participate in blood donation, please make the following preparations before donating blood:

1, learn blood donation knowledge and eliminate nervousness.

Don't take medicine before donating blood. If taking aspirin will reduce some functions of platelets within three days, don't take it three days before donating blood.

3, the food should be less fat. The day before and on the day of blood donation, you can eat according to your usual habits, but low fat is appropriate.

4. Don't drink alcohol, especially hard liquor.

5, adequate sleep, it is not appropriate to do strenuous exercise.

Blood donation procedure

1, register

Fill in the form before each blood donation, and personal data will be kept by the computer system of the blood station.

2, hemoglobin, hepatitis B screening and blood pressure.

Take a drop of blood from your fingertips and test whether your hemoglobin and liver meet the national standards for blood donors, which will test whether your blood pressure is normal.

3, venous blood and needles

Venous blood collection is carried out by professional nurses. All needles are sterilized and used only once to ensure that blood donors are not infected.

4, blood donation time

About seven to twelve minutes.

Step 5 rest

After donating blood, provide drinks and biscuits. A little drink by a blood donor can immediately restore the water pushed by your body.

Attention should be paid after blood donation

1. Protect the venipuncture site: the puncture site did not heal completely after hemostasis. Don't soak in water for at least 24 hours, don't be polluted by unclean things, and don't rub on this part.

2. Personal activities should be moderate: please don't engage in aerial work, high temperature work, driving vehicles, sports competitions, all-night entertainment and other activities on the day after blood donation.

3. Don't over-supplement nutrition: You can eat fresh vegetables, fruits, bean products, dairy products, fresh fish, shrimp, meat and eggs. Please don't overeat.

blood test

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

2, blood type stereotypes: ABO blood type must conform to the positive and negative stereotypes. 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, and it should be less than 25 units as determined 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: At present, four items such as hepatitis B virus surface antigen, hepatitis C virus antibody, HIV antibody and syphilis serological examination are examined. Anyone who tests positive may not participate in blood donation.