How long can I donate blood after donating blood? Thank you for your questions.

The state encourages healthy citizens aged 0/8 to 55 to donate blood voluntarily. It is stipulated that each blood donation is generally 200 ml to 400 ml, and the interval between two blood donations is not less than 6 months. Supplementary information on blood donation Q: What is blood donation without compensation? Why should this system be implemented? A: Free blood donation means that you voluntarily donate your blood to social welfare undertakings for the lives of others. Blood donors don't get paid from blood collection units, blood donors and blood donors. Free blood donation is a noble act of selfless dedication and saving lives, and it is the general direction of blood cause in China. Free blood donation is not for money, but a manifestation of dedication and the only way to ensure medical safety. Only by donating blood for the purpose of humanitarian selfless dedication rather than economic return can we fundamentally eliminate all kinds of disadvantages brought by paid blood supply, ensure blood quality, protect the safety of blood recipients and minimize the harm of blood-borne diseases. Q: Will blood donation affect your health? A: No, after donating blood, drinking proper amount of water can completely restore normal blood volume within 2 hours. The total blood volume of a normal person accounts for about 8% of the body weight, and a person weighing 60 kg has about 4800 ml of blood. Donating 200 ml of blood at a time only accounts for 1/20 of the whole body blood volume, and will not affect the normal blood circulation. Moreover, the life cycle of red blood cells is about 120 days in plain area and about 80 days in plateau area. Blood donation at intervals of not less than 6 months is harmless to health. In normal blood circulation, 80% of human blood participates in circulation to ensure normal physiological function, and the remaining 20% is stored in organs such as liver, spleen and subcutaneous capillaries. When the body needs it, this part of the blood will be released immediately and added to the blood circulation. Therefore, donating no more than 400 ml of blood at a time will not cause harm to the body. Q: What should I pay attention to before and after blood donation? A: Comrades who participate in blood donation should ensure adequate sleep the night before blood donation, and do not eat greasy and high-protein food the night before blood donation and in the morning to prevent "fatty blood". You can eat some casual diets, such as porridge, steamed bread, bread and so on. Keep your arms, especially your elbows clean before donating blood. In the process of blood donation, don't be nervous, and work closely with the blood collection medical staff. After donating blood, the eye of the needle should be pressed with sterile gauze for ten minutes to prevent bleeding. Don't rub the eye of the needle when stopping bleeding to prevent subcutaneous bleeding. Don't do strenuous exercise for one or two days after donating blood. Q: Those people can't donate blood for the time being? Answer: 1. You can donate blood two weeks after receiving the last immunization of measles, mumps, yellow fever and polio live vaccine, or four weeks after the last immunization of rubella live vaccine and rabies vaccine; After being bitten by rabies, you can donate blood one year after the last rabies vaccine. 2. People who receive animal serum can donate blood four weeks after the last injection. 3. Tooth extraction or other minor operations within half a month. 4. Three days before and after menstruation, less than six months after pregnancy and abortion, and less than one year after childbirth and breastfeeding. 5. Those who have recovered from cold and acute gastroenteritis for less than a week, acute urinary tract infection for less than a month, and pneumonia for less than three months. 6. Some infectious diseases: for example, dysentery recovered in less than half a year, typhoid fever recovered in less than one year, brucellosis recovered in less than two years, and malaria recovered in less than three years. 7. Transfusion of whole blood and blood component in recent five years. 8. Less than half a year after major surgery, less than three months after appendectomy, hernia repair and tonsillectomy. 9. Less than one week after the local inflammation of the skin healed, and less than two weeks after the extensive inflammation healed. Q: Those people can't donate blood? A: In order to ensure the health and safety of blood donors and recipients, the Ministry of Health has promulgated the Standard for Health Examination of Blood Donors, which stipulates that the following persons are not allowed to participate in blood donation: 1. Patients with sexually transmitted diseases, leprosy and AIDS, and people infected with HIV. 2. Hepatitis patients, hepatitis B surface antigen positive, hepatitis C antibody positive. 3. Patients with allergic diseases and recurrent allergies, such as recurrent urticaria, bronchial asthma and drug allergy (blood donation is not allowed for simple urticaria during acute attack). 4. Various tuberculosis patients, such as tuberculosis, renal tuberculosis, lymphoid tuberculosis, bone tuberculosis, etc. 5. Patients with cardiovascular diseases, such as various heart diseases, hypertension, hypotension, myocarditis and thrombophlebitis. 6. Patients with respiratory diseases, such as chronic bronchitis, emphysema, bronchiectasis with pulmonary insufficiency. 7. Patients with digestive system and urinary system diseases, such as severe gastric and duodenal ulcer, chronic gastroenteritis, acute and chronic nephritis, chronic urinary tract infection, nephrotic syndrome, chronic pancreatitis, etc. 8. Patients with hematological diseases, such as anemia, leukemia, polycythemia vera and various bleeding and coagulation diseases. 9. Patients with endocrine diseases or metabolic disorders, such as pituitary and adrenal diseases, hyperthyroidism, acromegaly, diabetes insipidus, diabetes, etc. 10. Patients with organic nervous system diseases or psychosis, such as encephalitis, sequelae of brain trauma, epilepsy, schizophrenia, hysteria, severe neurasthenia, etc. 1 1. Patients with parasitic diseases and endemic diseases such as kala-azar, schistosomiasis, filariasis, hookworm disease, cysticercosis, paragonimiasis, Keshan disease and Kaschin-Beck disease. 12. Various malignant tumors and benign tumors that affect health. 13. Those who have undergone resection of important organs such as stomach, kidney and spleen. 14. Patients with chronic skin diseases, especially infectious, allergic and inflammatory systemic skin diseases, such as favus, generalized eczema and systemic psoriasis. 15. Patients with ocular diseases such as keratitis, iritis, optic neuritis, high myopia, etc. 16. autoimmune diseases and collagen diseases such as systemic lupus erythematosus, dermatomyositis and scleroderma. 17. People with a history of drug abuse. 18. Homosexuals and multiple sexual partners. Q: What preparations should I make before donating blood? A: If you have passed the health examination and participated in blood donation, please make the following preparations before donating blood: 1. Learn the knowledge of blood donation to 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. Food should be low in 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. Get enough sleep and don't do strenuous exercise. Q: What are the steps to donate blood? A: What are the steps for blood donation? 1. Blood donation registration: Please bring your ID card, work permit and blood donation medical certificate to register for blood donation. 2. Waiting for blood donation: Due to the centralized arrival of blood donors, blood donation is always carried out one by one, and it is inevitable to wait patiently. You can prepare books, newspapers and magazines to read in advance. 3. Brush your arm: An unclean arm can easily cause infection and blood pollution at the puncture site of your arm. Please be sure to wash it carefully. 4. Sulfuric acid tincture disinfection: Do not touch the disinfection parts after disinfection. 5. Check before blood collection: Please answer the questions raised by the blood collector during the check, such as "What's your name?" "What blood type are you?" Wait a minute. 6. Blood collection: Please lie on the blood collection chair, keep an inclined posture, and make a fist before puncture; Once the blood collection needle pierces the vein, loosen the fist until the blood collection is completed. 7. Hemostasis: Please hold down the tampon for at least 5 minutes after blood collection. Please don't twist the tampon to prevent subcutaneous hematoma.