A long list of factors can make you ineligible to donate plasma, ranging from chronic infections and certain medications to something as simple as high blood pressure on the day you show up. Some disqualifications are permanent, others are temporary deferrals lasting days to years. Here’s a breakdown of every major category.
Permanent Medical Disqualifications
Certain health conditions ban you from donating plasma for life. These exist because the conditions either pose a direct risk to the recipient of your plasma or make donation unsafe for you. The major ones include:
- HIV/AIDS: Anyone who has ever tested positive for HIV or taken HIV medication is permanently ineligible.
- Hepatitis B or C: A positive test at any point in your life, even if the infection resolved, disqualifies you permanently.
- Blood cell cancers: Leukemia, lymphoma, and myeloma result in a lifetime ban, even if you’re currently cancer-free.
- Severe heart disease: You must have had no heart-related symptoms within the past six months at minimum, and severe cases are permanently disqualifying.
- Severe asthma: Poorly controlled or severe asthma is a permanent disqualification.
- Congenital bleeding disorders: Conditions like hemophilia that affect your blood’s ability to clot rule you out permanently.
- Prion disease exposure: This includes people who used bovine-derived insulin or spent extended time in certain European countries during the mad cow disease outbreak (1980 onward). U.S. military personnel who lived on European bases for more than six months between 1980 and 1996 are also excluded.
Medications That Defer You
Several medications temporarily disqualify you because traces in your plasma could harm a recipient, particularly a pregnant woman’s unborn baby. The acne drug isotretinoin (commonly known by the former brand name Accutane) requires a one-month wait after your last dose. Finasteride, used for hair loss and prostate symptoms, carries a six-month deferral.
Blood thinners are a separate concern. Anticoagulants affect your blood’s clotting ability, which can cause excessive bruising or bleeding at the needle site during donation. Most blood thinners require you to wait at least seven days after your last dose before donating, though the specific window varies by medication. If you take any prescription drug regularly, expect the screening staff to ask about it.
Day-of-Donation Physical Screening
Even if you’re generally healthy, you can be turned away based on your vitals that day. Before every donation, staff check your blood pressure, pulse, and iron levels. Your systolic blood pressure (the top number) must fall between 90 and 180, and your diastolic (bottom number) between 50 and 100. Your pulse needs to be regular and between 50 and 100 beats per minute. If you’re nervous, dehydrated, or had too much caffeine, these numbers can land outside the acceptable range.
Iron levels are the other common stumbling block. Men need a hemoglobin reading of at least 13.0 g/dL, while women need at least 12.5 g/dL (with some facilities accepting as low as 12.0 for women under specific protocols). Low iron is one of the most frequent reasons donors get deferred, especially women and frequent donors. Eating iron-rich foods and staying well-hydrated in the days leading up to your appointment helps.
Travel to Malaria-Risk Areas
If you’ve recently traveled to a region where malaria is present, you’ll face a three-month deferral from the date you returned. This applies to most of sub-Saharan Africa, parts of South and Southeast Asia, Central America, and other tropical regions. If you previously lived in a malaria-endemic area rather than just visiting, the wait extends to three years. These deferrals exist because malaria can circulate in your blood without causing obvious symptoms, and standard screening tests don’t reliably catch it.
Tattoos, Piercings, and Body Modifications
Getting a tattoo, permanent makeup, microblading, or body piercing doesn’t automatically disqualify you, but the details matter. If your work was done in a state-regulated shop using sterile needles and single-use ink or equipment, most donation centers will accept you with no waiting period. Piercings done at retail establishments like Claire’s, which use single-use equipment, are also fine.
However, if you got your tattoo or piercing in one of several states that lack certain regulations (including New York, Georgia, Maryland, Pennsylvania, and others), or if the shop didn’t use single-use equipment, you’ll need to wait three months before donating.
Pregnancy and Recent Childbirth
You cannot donate plasma while pregnant. After giving birth, the standard waiting period is six months before you’re eligible again. This deferral gives your body time to recover its blood volume and protein levels, both of which are significantly affected by pregnancy and delivery.
Donation Frequency Limits
There’s a ceiling on how often you can donate, and exceeding it will get you turned away. FDA rules allow plasma donation no more than twice in a seven-day period, with at least 48 hours between sessions. In practice, this means most donors go twice a week with at least two calendar days in between.
If you donated whole blood (a standard blood donation where red cells aren’t returned), you must wait eight weeks before donating plasma. The same eight-week rule applies to any plasma donation where your red blood cells weren’t returned to you for some reason.
Other Common Reasons for Deferral
Beyond the categories above, several other factors can make you temporarily ineligible. Most centers require you to be at least 18 years old (some states allow 16 or 17 with parental consent for blood donation, but plasma centers typically require 18). You generally need to weigh at least 110 pounds, because the volume of plasma collected is calibrated to body size, and smaller donors face a higher risk of adverse reactions.
Active infections, including the flu, a cold, or a fever, will defer you until you’ve recovered. Recent surgeries, dental work, and certain vaccines can also trigger short deferrals ranging from a day to several weeks depending on the procedure. Intravenous drug use is a permanent disqualification at most centers, while other high-risk behaviors may result in temporary deferrals depending on the facility’s policies.
If you’ve been deferred, ask the center for specifics. Many deferrals are temporary, and staff can tell you exactly when you’ll be eligible to return.