Importance of Biochemistry

How many times you can donate blood?

Time for blood donation?



blood donation

How many times you can donate blood?

Time for blood donation:

Time for blood donation and information all of it is listed below.Donating blood saves lives of many people, and they help donors regularly to secure the amounts of blood needed for necessary cases.

Some factors affect the possibility of frequent blood donation for some people, including medications, health conditions, and travel, and some may have to wait a specific time before donating, and this is what we will discuss in this article.

How long must a donor wait before donating blood again?

The waiting time depends on the type of donation, as the blood components are renewed at different rates and take different times.

for example:

  •  Whole blood donation: This donation provides all blood components, including red blood cells, platelets and plasma. Donors can repeat this type of donation every 56 days.
  •  Duplicate red blood cell donation: This donation provides 2 units of red blood cells, and can be repeated every 112 days, or 3 times annually.
  •  Platelet donation: every 7 days, or 24 times a year.
  •  Plasma donation: every 28 days, or 13 times annually.


You must wait a specified period of time before donating blood if you are taking certain types of medications.

 According to the American Red Cross, these types include:

  •  Aspirin: People may have to wait two days after their last dose of aspirin to be allowed to donate platelets.
  •  Antibiotics: Individuals cannot donate blood if they are taking antibiotics to treat a bacterial infection, to reduce the likelihood of transmitting the infection. They may be able to donate blood on the last day of an oral antibiotic dose or 10 days after completing the injection antibiotic dose.
  •  Bovine insulin: This drug was used to treat diabetes, but it is no longer available in the United States of America, and people who have taken it since the 1980’s are not allowed to donate blood.
  •  Isotretinoin or finasteride: You must wait one month from the date of the last dose before donating blood.
  •  Dutasteride: You must wait 6 months from the date of the last dose before donating blood.
  •  Blood thinners: People treated with thinners must wait 2-7 days from the date of the last dose before donating blood, and the duration varies according to the type of medicine.
  •  Pituitary-Derived Human Growth Hormone: People who take this hormone are never allowed to donate blood.
  •  Thalidomide: You must wait an entire month after taking this drug before donating blood.
  •  Mycophenolate mofetil: Individuals must wait 6 weeks before donating.
  •  Acitretin: blood donation is allowed after 3 years.
  •  Etretinite: People treated with this drug are prohibited from donating blood.
  •  Levlunomide, teriflunomide, Vismodig or Sonidjeb: You must wait two years after taking these medications before donating blood.
  •  Hepatitis B immunoglobulin: Wait 12 months before donating.

How often can you donate blood - donating blood helps to secure the amounts of blood needed for necessary cases - red blood cells, platelets and plasma

Some types of drugs may not prevent whole blood donation, but you must wait a certain time before donating platelets, and these drugs include:

  •  Ticagrelor.
  •  Prasugrel.
  •  Piroxicam.
  •  Clopidogrel.
  •  Ticlopidine.
  •  Forapaxar.

You must wait a certain time before donating blood if you are given one of the following vaccinations:

  •  Zostavax: 4 weeks.
  •  Measles, rubella, mumps, and chickenpox vaccines: 4 weeks.
  •  Red measles, polio and yellow fever vaccines: 2 weeks.
  •  Hepatitis B immunization: 21 days, provided that the donor is not exposed to hepatitis B during this period.
  •  Smallpox Vaccine: 8 weeks.

Health conditions:

Certain health conditions affect individuals’ ability to donate or be repeated multiple times. It is taken care of not to transmit any infection to the person who receives blood, in addition to protecting the donor from any risk to his health due to donating blood.

Among these cases:

  •  Blood clotting disorders: People with these disorders cannot donate blood, as they may have excessive bleeding.
  •  Asthma: People with asthma can donate if they do not show any symptoms on the day of donation and are in good health.
  •  High blood pressure: Donation is permitted if systolic blood pressure is less than 180 and diastolic is less than 100.
  •  Low blood pressure: Donation is allowed if the person is healthy and has a systolic blood pressure of at least 90 and diastolic blood pressure of at least 50.
  •  Cancer: People with leukemia cannot donate blood, but people who have been successfully treated and cured of other cancers other than leukemia are allowed to donate 12 months after completion of treatment.
  •  Heart diseases: You must wait 6 months to donate blood after suffering from any heart disease, and in some cases, people with heart diseases are not allowed to donate blood at all.
  •  Hemochromatosis: People with hemochromatosis are not allowed to donate blood.
  •  Human Immunodeficiency Virus (AIDS): A person cannot donate blood if he has AIDS, or if he has tested positive for HIV, or even if he is at risk of contracting AIDS.
  •  Sickle cell anemia: Carriers of the genes responsible for sickle cell anemia can donate blood, but people with sickle cell anemia who have symptoms are not allowed to donate.

People who have had hepatitis or take an intravenous drug without a prescription should wait before donating blood, to prevent the risk of transmitting AIDS or hepatitis.

Some sexually transmitted diseases affect the ability to donate blood, as people who have been treated for syphilis or gonorrhea cannot donate blood until 3 months after recovery.

People with chlamydia or sexually transmitted warts can donate blood if they are in good health on the day of donation.

Other factors:

Do not donate blood if you have a fever, or have any symptoms such as coughing up sputum or an allergy that causes shortness of breath, and also do not donate if you are in poor health or feel tired.

Pregnant women are not allowed to donate, and they have to wait 6 weeks after giving birth to donate blood.

Donors must have good levels of iron and undergo a hemoglobin test before donating, as iron is one of the essential minerals in the body, and it is very important because it helps replace red blood cells that a person loses as a result of donation.

Tattoos and piercings:

Tattoos may affect the ability to donate, due to the risk of the donor contracting hepatitis due to unsterilized or contaminated needles. To avoid this, officials should ensure that individuals who have tattoos or piercings to place jewelry have tattooed or pierced at a trusted institution.

The tattoo artist should use sterile needles and fresh ink. If the tattoo meets these criteria, a person can donate blood even right after the tattoo.

People who have jewelry piercings are allowed to donate blood as long as the piercing machine is in first use and has not been used repeatedly. But if the machine is used more than once, or the person is not sure that it is used for the first time, he must wait 3 months before being allowed to donate.


Traveling to other countries also affects the ability to donate blood, as an individual who has traveled or stayed for a period in malaria-endemic countries must wait before donating blood to ensure his safety and health.

According to the American Red Cross, the time frame is set as follows:

  •  Wait 3 years after receiving malaria treatment.
  •  Wait 3 months if you come from a country where there is a high risk of malaria.
  •  Wait 3 years if you live for 5 years in a country where malaria is dangerous.
  •  Wait an additional 3 years if the person previously traveled to a country where there is a high risk of contracting malaria, without spending 3 consecutive years in a country without this risk.

When traveling outside the United States of America and Canada, staff at the blood donation center will review the details and check the safety and health of the donor to determine his ability to donate blood.


Many lives can be saved by donating blood, but donors must know that some factors may affect their ability to donate, and when they can donate. The donor must fill out a form that includes details including his medical history, which ensures the safety of donated blood and its effectiveness in helping people.

In some cases, the donor has to wait a certain period of time before he can donate blood, and donors also have to leave time distances between repeated donations of blood, depending on the type of donation.

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