Who Can/Cannot Donate Blood?

Generally, a healthy individual with an average age of 18–65, weighing over 50kg (110 lbs), and those having normal blood pressure can normally donate blood.

Key exclusions for blood donation include active infections, chronic diseases like HIV or Hepatitis B/C, recent tattoos, certain medication use, or high-risk lifestyle behaviors.

should keep in mind that the Donors must be in good health at the time of donation

Who Can/Cannot Donate?

Normally, there is a common thinking that anyone can donate blood except children but medicos have developed some guidelines and thus explained some guidelines and criteria for donation of blood.

Age: Usually between 18 and 65 years old (some areas allow 16-17 with parental consent).
Weight: Generally at least 45 to 50 kg (approx. 110 lbs).
Health: Feeling well on the day of donation.
Hemoglobin: Must meet minimum hemoglobin levels (usually
The amount of hemoglobin in the blood should be more than 12 gm.
People who donate blood should be in good health and should not suffer or have suffered from any serious illness . Heart, lungs, liver must be in good condition and any person with past or present illness like (Jaundice, malaria, typhoid, AIDS, hepatitis ) is contradicted. If the donor is using any drugs/medicines, s/he must consult the doctor before donating blood.

Period & Quantity
One can not donate blood more than four times a year, and for females, it is recommended to donate blood only two times a year. It is also recommended that one should not donate more than 400ml of blood at one time. After each withdrawal of blood, it takes 36 hours for the body to reconstitute the fluid volume and 21 days for the blood cell count to return to a normal level.

Who cannot donate blood?

Blood donation is prohibited for persons with following health problems. Tuberculosis, Sexually Transferable diseases, Diabetes, Asthma, High Blood pressure, Kidney problems, Heart diseases, Jaundice, Fever, AIDS.
Also if the person is taking medicine for long time or addicted to any drugs, s/he is prohibited for donating blood. Incase of females, one can not donate during her periods, pregnancy and also during breast feeding.
source:bloodmembers.com