Donating plasma requires meeting a specific set of eligibility criteria, passing a same-day physical screening, and clearing a health history questionnaire. The rules are set primarily by the FDA and enforced by individual collection centers, so while minor details vary by facility, the core stipulations are consistent across the United States.
Basic Eligibility Requirements
You must weigh at least 110 pounds on the day of donation. Most plasma centers require donors to be at least 18 years old, though some states allow 16- or 17-year-olds with parental consent. You’ll need to bring a valid photo ID such as a driver’s license, military ID, or student ID. Some facilities require two forms of signed identification.
You also need a permanent address within the United States and, at most centers, a Social Security number. If you’re donating at a paid plasma center for the first time, expect to provide proof of address like a utility bill or bank statement in addition to your photo ID.
Vital Signs and Blood Tests
Before every donation, staff will check your blood pressure, pulse, and a small blood sample. The FDA sets clear cutoffs for each of these:
- Blood pressure: Systolic (top number) must be between 90 and 180, and diastolic (bottom number) must be between 50 and 100.
- Pulse: Must be regular and between 50 and 100 beats per minute.
- Hematocrit: Your red blood cell concentration must meet minimum thresholds, generally 39% for men and 36% for women. This is checked via a finger prick.
- Total protein: A minimum protein level in your blood is also required, typically checked from the same finger-prick sample.
If any of these readings fall outside the acceptable range, you’ll be turned away for that visit. You can usually return and try again on another day. Staying well-hydrated and eating a solid meal before your appointment are the simplest ways to keep your numbers in range.
How Often You Can Donate
FDA regulations allow source plasma donation up to twice within a seven-day period, with at least one day between sessions. Most commercial plasma centers follow this twice-per-week schedule. Your body replenishes plasma faster than whole blood, which is why the frequency is higher than the eight-week gap required for standard blood donation. That said, the collection center tracks your visits in a national database to make sure you aren’t exceeding limits by visiting multiple locations.
Medications That Delay Donation
Certain medications cause temporary deferrals ranging from a couple of days to several years. The waiting period depends on how the drug could affect the person receiving your plasma. Some of the most common ones:
- Blood thinners: Most oral blood thinners require a 2- to 7-day wait after your last dose.
- Isotretinoin (severe acne medication): 1 month after stopping.
- Finasteride (hair loss or prostate medication): 6 months after stopping.
- Oral HIV prevention drugs (PrEP): 3 months after the last dose. Injectable forms like long-acting cabotegravir require a 2-year wait.
- HIV treatment medications: Permanent deferral.
- Experimental or clinical trial medications: 12 months after the last dose.
Common over-the-counter medications like ibuprofen and acetaminophen generally don’t disqualify you. Antibiotics are typically fine once you’ve finished the course and the infection has cleared. If you’re unsure about a specific prescription, bring the bottle to your appointment so staff can look it up.
Health Conditions and Permanent Deferrals
The health history questionnaire screens for conditions that could make donation unsafe for you or for the recipient. Chronic illnesses like HIV, hepatitis B or C, and certain blood-clotting disorders result in permanent deferral. A history of most cancers also leads to permanent disqualification, with some exceptions for fully treated, non-blood-related cancers like basal cell skin cancer.
Conditions that are well-managed with medication, such as high blood pressure or diabetes, don’t automatically disqualify you. As long as your vitals fall within the acceptable range on the day of your visit and your medications aren’t on the deferral list, you can typically still donate.
HIV Screening: Individual Risk-Based Questions
The FDA updated its HIV screening policy in 2023, replacing the older approach that deferred all men who have sex with men. The current system uses individual risk-based questions for all donors regardless of gender or sexual orientation. You’ll be asked whether you’ve had a new sexual partner in the past three months and whether you’ve had anal sex with that new partner. A “yes” to both results in a three-month deferral. This same standard applies equally to every donor.
Tattoos, Piercings, and Travel
If you got a tattoo in a state that doesn’t regulate tattoo facilities, you’ll need to wait three months before donating. Tattoos from licensed, regulated shops in most states don’t trigger a deferral. Body piercings follow a similar rule: if the piercing was done with reusable equipment or there’s any doubt about whether single-use instruments were used, you must wait three months.
Travel to regions where malaria is common triggers a three-month deferral after your return. If you previously lived in a malaria-risk area, the wait extends to three years. Anyone who has been diagnosed and treated for malaria must wait three years after treatment and remain symptom-free during that time.
What to Do Before and After Your Appointment
Preparation makes a noticeable difference in how smoothly the donation goes and how you feel afterward. In the 24 hours before your visit, drink plenty of water, since dehydration is one of the most common reasons donors fail the screening or feel faint. Eat iron-rich foods like red meat, eggs, poultry, fish, or leafy greens. Pairing these with vitamin C sources (citrus fruit, pineapple, Brussels sprouts) helps your body absorb the iron more efficiently.
After donating, avoid heavy lifting, vigorous exercise, and working from heights for the rest of the day. Skip alcohol for at least 24 hours. Some donors experience lightheadedness, nausea, or bruising at the needle site. These are the most common side effects and usually resolve quickly. If you notice numbness, tingling, or worsening swelling in your arm, contact the donation center. Athletes should wait about 12 hours before returning to intense training.