Dozens of factors can disqualify you from donating plasma, ranging from permanent conditions like HIV to temporary ones like a recent tattoo or pregnancy. Some disqualifications are straightforward (you must be at least 18 and weigh at least 110 pounds), while others depend on timing, medication use, travel history, or what the screening center finds in your blood sample that day. Here’s a full breakdown of what can keep you from the donation chair.
Age, Weight, and Frequency Limits
You must be at least 18 years old and weigh a minimum of 110 pounds. These are hard cutoffs with no exceptions. The weight requirement exists because smaller bodies have less blood volume, and removing plasma from someone without enough to spare creates a safety risk.
Even if you’re otherwise eligible, you can only donate plasma every two days, and no more than twice in a seven-day period. Showing up too soon after your last visit will get you turned away.
Conditions That Permanently Disqualify You
Some medical conditions mean you can never donate plasma. These include:
- HIV/AIDS
- Ebola virus infection (past or present)
- Epilepsy
- Chronic high blood pressure that isn’t well controlled
- Primary immunodeficiency disorders
- Blood cancers like leukemia, lymphoma, and Hodgkin’s disease
Certain transplant types also permanently disqualify you, specifically transplants involving dura mater (the membrane covering the brain), animal organs, or living animal tissue. These carry a theoretical risk of transmitting prion diseases, which cannot be screened for in donated plasma.
Cancer History
Blood cancers are a lifetime disqualification, but other types of cancer don’t necessarily rule you out. If you’ve had a non-blood cancer, you can typically donate once it’s been more than 12 months since your treatment ended and there’s been no recurrence.
Low-risk skin cancers, like squamous cell or basal cell carcinoma, that were completely removed and have healed don’t require any waiting period at all. Precancerous cervical conditions that were successfully treated also won’t disqualify you.
Medications That Require a Waiting Period
Several common medications will temporarily keep you from donating. The wait times vary depending on how long the drug stays active in your system and what risk it poses to whoever receives your plasma.
Blood thinners generally require a 2- to 7-day deferral. Most newer oral blood thinners (the type prescribed to prevent clots in legs, lungs, or strokes) carry a 2-day wait. Warfarin requires 7 days, as does heparin.
Anti-platelet drugs, often prescribed after heart attacks or strokes, have longer windows. Some require a 2-day wait, others up to 14 days or even a month depending on the specific drug. If you take any medication to prevent blood clots or thin your blood, expect to be asked about it.
Isotretinoin, the powerful acne medication sold under brand names like Accutane, Absorica, and Claravis, requires a one-month deferral after your last dose. This is because isotretinoin causes severe birth defects, and plasma products could theoretically expose a pregnant recipient.
Temporary Medical Deferrals
Many common health situations will delay your eligibility for weeks or months rather than disqualify you forever.
- Pregnancy: You must wait 6 weeks after giving birth.
- Anemia or low iron: You can donate once the anemia resolves. Centers check your protein and iron-related levels at every visit, so even mild anemia will show up during screening.
- Hepatitis exposure: 12-month wait after possible exposure.
- Blood transfusion: 3-month wait after receiving a transfusion in the United States.
- Zika virus: 120-day deferral from when symptoms resolve or from your last positive test, whichever is longer.
- Major surgery: Deferral length depends on whether you received a transfusion during surgery and the underlying reason for the procedure.
General illness matters too. If you show up with a fever, cold, flu, or any active infection, you’ll be turned away until you recover. Centers screen for visible signs of illness and check your vital signs before every donation.
Tattoos and Piercings
A tattoo or piercing doesn’t automatically disqualify you, but the details matter. In most states, if the tattoo was applied at a state-regulated facility using sterile, single-use needles and ink that wasn’t reused, you can donate right away. The same applies to cosmetic tattoos and microblading done at licensed establishments.
If your tattoo was done in a state that doesn’t regulate tattoo facilities, you’ll need to wait three months. For piercings, the key question is whether the instruments were single-use and disposable. If a reusable piercing gun was used, or if there’s any doubt, the wait is three months.
Travel to Malaria-Risk Areas
Travel history is one of the more complex disqualification categories. If you’ve visited an area where malaria is present, you typically can’t donate for three months after returning. If you previously lived in a malaria-endemic area, the wait extends to three years. And if you were actually diagnosed with and treated for malaria, you’re deferred for three years after treatment, provided you’ve had no symptoms during that time.
The CDC maintains updated lists of malaria-risk countries, and donation centers use these to evaluate your travel history. Even brief layovers in certain regions can trigger a deferral, so be prepared to answer detailed questions about any international travel.
Sexual History Screening
The FDA updated its donor eligibility guidelines in 2023, moving away from blanket deferrals based on sexual orientation. The previous policy deferred men who had sex with men for a set period. The current approach uses individual risk-based screening questions that apply equally to all donors regardless of gender or sexual orientation. These questions focus on specific recent behaviors that increase the risk of HIV transmission, such as having a new sexual partner combined with anal sex in the past three months. This policy applies to all blood and plasma collection, including source plasma centers.
Vaccines
Most standard vaccines, including flu shots, tetanus, and COVID-19 vaccines, use inactivated material and won’t delay your donation at all. You can give plasma the same day you receive one.
Live vaccines are different. These use weakened but living virus material and typically require a four-week wait before donating blood or platelets. Common live vaccines include MMR (measles, mumps, rubella), chickenpox, and the nasal spray version of the flu vaccine. For plasma specifically, the wait may be shorter since the manufacturing process includes pathogen-reduction steps, but individual centers set their own policies.
What Happens at the Screening
Even if none of the above applies to you, the pre-donation screening can still turn up disqualifying factors. Every visit includes a check of your vital signs (temperature, blood pressure, pulse) and a finger-stick blood test. If your protein levels are too low, your iron markers are off, or your blood pressure reads too high that day, you’ll be deferred until the numbers improve. These same-day deferrals are often temporary, sometimes just a matter of eating better, hydrating, and coming back in a few days.
You’ll also complete a health questionnaire covering your recent medical history, sexual activity, travel, and drug use. Intravenous drug use is a permanent disqualification. Providing false answers on this questionnaire can result in a permanent ban from the donation center.