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Who should not donate blood

Jun 20, 2025 Source: Cainiu Health
Dr. Liu Feng
Introduction
Generally, individuals who are not eligible to donate blood include patients with infectious diseases, patients with blood disorders, individuals who have recently undergone surgery, women who are pregnant or breastfeeding, and people experiencing an allergic reaction. Individuals are not allowed to donate blood within six months after major surgery or within one month after minor surgery. The body is in a recovery phase following surgical trauma, and blood donation may interfere with postoperative recovery, potentially leading to physical weakness, anemia, or other complications due to blood loss.

　　Individuals generally not eligible to donate blood include patients with infectious diseases, blood disorders, those who have recently undergone surgery, pregnant or breastfeeding women, and individuals experiencing an allergic reaction phase. The details are as follows:

　　1. Patients with infectious diseases: Individuals infected with hepatitis B, hepatitis C, HIV/AIDS, syphilis, and other infectious diseases are prohibited from donating blood. These pathogens can exist in the blood, and donating blood could transmit viruses through blood transfusions, endangering the health of recipients and causing serious infection risks.

　　2. Patients with blood disorders: Individuals suffering from leukemia, anemia, hemophilia, and other blood diseases are not suitable blood donors. These diseases affect blood components and hematopoietic function. Donating blood not only worsens their own conditions, but the donated blood also fails to meet clinical blood safety standards.

　　3. Recent surgery patients: Individuals who have undergone major surgery within six months or minor surgery within one month should not donate blood. Surgical trauma places the body in a recovery phase, and donating blood could interfere with post-operative recovery and potentially cause weakness, anemia, or other issues due to blood loss.

　　4. Pregnant and breastfeeding women: Women who are pregnant or breastfeeding should not donate blood. During pregnancy, sufficient nutrition must be ensured for both mother and fetus, while breastfeeding requires maintaining milk production. Blood donation may lead to nutrient loss, affecting the health of both mother and child.

　　5. Individuals experiencing an allergic reaction phase: Those currently experiencing allergic symptoms such as urticaria, allergic rhinitis, asthma, or taking antiallergic medications should not donate blood. Allergic reactions and medication components may affect blood quality, increasing the likelihood of adverse reactions in blood recipients.

　　Before donating blood, carefully read the health questionnaire, truthfully declare your health status, and actively cooperate with staff during screening. If unsure whether you meet the donation criteria, consult professional personnel at the blood donation center in advance.

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What are the benefits and risks of blood donation for women?
Under normal circumstances, blood donation for women generally has benefits such as promoting blood circulation, stimulating hematopoietic function, reducing blood viscosity, decreasing the risk of cardiovascular and cerebrovascular diseases, and enhancing immunity. However, potential disadvantages may include temporary dizziness and fatigue, temporary decline in immunity, menstrual cycle disturbances, increased risk of anemia, and delayed wound healing. If any abnormalities occur, prompt medical attention is recommended.
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Post-Donation Precautions and Dietary Restrictions
In general, after donating blood, it is important to rest appropriately, replenish nutrition, protect the puncture site, avoid donating blood again in a short period, and monitor your physical condition. It is not recommended to consume spicy food, fried peanuts, white liquor, ice cream, salted fish, etc. Maintaining healthy lifestyle habits after blood donation, such as getting sufficient sleep and engaging in moderate exercise, can help the body recover more quickly.
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Can individuals with "small three positives" donate blood?
Individuals with the 'minor three positives' (referring to specific hepatitis B serological markers) carry the hepatitis B virus in their bodies, and viral particles may exist in their blood. Transfusing blood containing the virus into a recipient can lead to hepatitis B transmission and increase the recipient's risk of infection. To ensure blood safety and prevent bloodborne disease transmission, blood donation standards explicitly state that individuals with the 'minor three positives' are not allowed to donate blood.
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Is blood donation beneficial for people with high blood pressure?
Under normal circumstances, if a person with high blood pressure has their blood pressure well-controlled in daily life, donating blood appropriately may provide certain benefits. However, if their blood pressure is not well-managed, donating blood at such times would not be beneficial. If any discomfort symptoms arise, it is recommended to seek timely medical consultation and treatment at a正规 hospital. Before donating blood, it is essential to consult with a qualified physician to confirm whether your health condition is suitable for blood donation.
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How many milliliters is 400 cc of donated blood?
Donating 400 cc of blood is equivalent to donating 400 ml, as both units are exactly equal in volume. However, before donating blood, you should ensure adequate sleep and avoid donating on an empty stomach. Women should avoid donating blood three days before and after their menstrual period. If you have recently experienced symptoms such as cold, fever, or other discomfort, or if you suffer from infectious diseases, cardiovascular diseases, or other illnesses, you should not donate blood in order to ensure both the safety of blood donation and your own health.
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What is the maximum amount of blood one can donate?
For first-time blood donors or those with a lighter body weight or weaker constitution, a blood donation volume of 200 ml is usually recommended. This amount has a relatively minor impact on the body, results in a smaller reduction of blood volume after donation, and is easier to recover from, thereby reducing the likelihood of experiencing adverse symptoms such as dizziness and fatigue, and ensuring the donor's health.
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How many milliliters of blood does a normal person donate at one time?
Under normal circumstances, a healthy individual usually donates 200-400 milliliters of blood per donation. Blood donation should be conducted at a正规 hospital. Before donating blood, one should ensure adequate sleep and maintain a light diet, avoid donating on an empty stomach, refrain from consuming alcohol or staying up late the previous night; during donation, one must truthfully inform the medical staff of their health status; after donating blood, pressure should be applied to the needle site for 10-15 minutes to prevent bleeding.
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