How often can you donate blood?

You can donate whole blood every 56 days (8 weeks). Platelet donations can be made every 7 days, up to 24 times per year. Plasma donations are allowed every 28 days. Double red cell donations require a 112-day (16-week) wait between donations.

What disqualifies you from donating blood?

Common disqualifications include weighing under 110 pounds, having a fever or feeling unwell on the day of donation, recent tattoos or piercings (3-12 month deferral depending on country), certain medications like blood thinners or Accutane, recent travel to malaria-risk areas, and pregnancy. Some conditions cause permanent deferral while others are temporary.

Blood Donation Eligibility Checker

Important: This tool provides general guidance only. Final eligibility is always determined at the donation center by trained staff.

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Eligibility rules vary by country. Choose yours to get accurate guidance.

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Reminder: This tool provides general guidance only. Final eligibility is determined at the donation center. Always be honest during the screening process -- it protects both you and the recipient.

Blood Donation Requirements and Benefits

Who Can Donate Blood?

Most healthy adults can donate blood. In the United States, donors must be at least 17 years old (16 with parental consent in some states), weigh at least 110 pounds, and be in good general health. Similar requirements apply in the UK, Canada, and Australia, though specific age limits and weight thresholds may differ slightly.

Types of Blood Donation

Whole blood donation is the most common type. About one pint is collected, and the process takes roughly 10 minutes after setup. You can donate whole blood every 56 days (8 weeks).

Platelet donation (apheresis) collects only platelets while returning other blood components to your body. Platelets are critical for cancer patients and surgical procedures. You can donate platelets every 7 days, up to 24 times per year.

Plasma donation collects the liquid portion of your blood. Plasma is used to treat burn victims, patients with clotting disorders, and those with immune deficiencies. You can donate plasma every 28 days.

Common Reasons for Temporary Deferral

Recent tattoo or piercing: Wait 3 to 12 months depending on your country and whether the facility was state-regulated.
Travel to malaria-risk areas: Deferral periods range from 3 to 12 months after returning.
Medications: Blood thinners, antibiotics, and Accutane (isotretinoin) typically require deferral until the medication is completed or a waiting period has passed.
Recent surgery or dental work: Minor dental work may require a 24-72 hour wait; surgery deferrals vary based on the procedure.
Pregnancy: Most countries require waiting 6 weeks to 6 months after giving birth before donating.
Cold or flu: You must be symptom-free and feeling well on the day of donation.

Why Donate Blood?

Every two seconds, someone in the United States needs blood. A single donation can save up to three lives. Blood cannot be manufactured -- it can only come from generous donors. Regular donation also provides free health screenings, including blood pressure checks, hemoglobin levels, and tests for infectious diseases.

How to Prepare for Blood Donation

Drink plenty of water before your appointment
Eat a healthy meal within a few hours of donating
Get a good night's sleep the night before
Bring a valid photo ID
Wear clothing with sleeves that can be rolled up above the elbow