What is the minimum weight requirement for blood donation?

Blood donation generally requires donors to weigh more than 45 kilograms; individuals below this weight are not advised to donate blood.

After donating blood, a portion of blood volume is temporarily lost, which may lead to symptoms of low blood pressure such as dizziness, palpitations, blurred vision, and sweating. In severe cases, fainting may occur. To minimize these adverse effects, donors are required to weigh at least 45 kilograms. The higher a donor's body weight, the lower the likelihood of developing low blood pressure after donation. For individuals with normal or slightly higher body weight, donating blood appropriately can bring certain health benefits, including promoting metabolism and enhancing immune function.

Prior to donation, in addition to meeting the weight requirement, donors must also undergo several medical examinations. Only those who pass these screenings are eligible to donate. Individuals currently taking medication or in special physiological conditions such as pregnancy should avoid donating blood to prevent potential adverse effects on their health.