Plasma donation centers screen every donor before each visit, and the list of reasons you could be turned away is longer than most people expect. Some disqualifications are permanent, others are temporary deferrals that lift after a waiting period. The rules come from FDA regulations and individual center policies, and they cover everything from your weight to your recent travel history.
Basic Age and Weight Requirements
You need to be at least 18 years old and weigh at least 110 pounds. These thresholds exist because smaller bodies have less blood volume, and removing plasma from someone without enough to spare raises the risk of side effects like dizziness or fainting. Some centers set their own upper age limits or require additional screening for older donors, so the specifics can vary by facility.
Low Hemoglobin or Protein Levels
Before every donation, the center checks a small blood sample. One key number is your hemoglobin level, which reflects how well your blood carries oxygen. Men need at least 13.0 g/dL, and women need at least 12.5 g/dL (with some facilities accepting as low as 12.0 g/dL under special protocols). Total protein levels are also checked, and falling below the center’s cutoff means you’ll be turned away that day.
If you’ve been deferred for low hemoglobin, it often points to iron deficiency. Eating iron-rich foods like red meat, spinach, and beans between donations can help, but frequent plasma donors are especially prone to gradual drops in these levels over time.
Chronic Conditions That Permanently Disqualify You
Certain medical histories result in a lifetime ban from donating plasma:
- HIV/AIDS: A positive HIV test or any history of taking antiretroviral therapy to treat HIV.
- Hepatitis B or C: A positive test at any point, or a history of symptoms like unexplained jaundice.
- Blood cancers: Leukemia, lymphoma, and other cancers of the blood or bone marrow.
- Sickle cell disease: The disease itself disqualifies you, though carrying the sickle cell trait without having the disease may not, depending on the center.
- Creutzfeldt-Jakob disease (CJD): A diagnosis, a family history of the genetic form, or having received certain medical products historically linked to CJD (such as cadaveric pituitary growth hormone).
- Ebola virus: Anyone who has ever had Ebola is permanently ineligible.
Temporary Medical Deferrals
Many health events don’t disqualify you forever but do require a waiting period before you can donate again.
If you’ve had a heart attack, bypass surgery, angioplasty, or a significant change in a heart condition that required new medication, the typical wait is at least six months. A blood transfusion from another person triggers a three-month deferral. Sexually transmitted infections like syphilis or gonorrhea also carry a three-month wait after treatment is complete.
Common illnesses like a cold, flu, or COVID-19 will get you turned away until you’ve fully recovered. If you were prescribed antibiotics for an infection, you generally need to finish the full course and be symptom-free before you’re eligible again. There’s no fixed number of days for this; the center wants to see that you’re healthy on the day you show up.
Pregnancy and Postpartum
You cannot donate plasma while pregnant. After delivery, miscarriage, or termination of a pregnancy, most centers require a six-month waiting period. This is longer than the six-week deferral some blood banks use for whole blood donation, because plasma donation places different demands on the body’s fluid balance and protein stores during recovery.
Medications That Trigger a Deferral
Certain medications affect either the safety of the plasma or the health of the donor. The waiting periods vary widely depending on the drug:
- Isotretinoin (severe acne treatment): One-month wait after your last dose.
- Finasteride (hair loss medication): Six-month wait.
- Blood thinners: Newer oral anticoagulants require a two-day wait, while warfarin and heparin require seven days.
- Etretinate (a psoriasis drug no longer widely available): Permanent deferral if you’ve ever taken it, because it stays in the body’s fat stores for years.
- HIV prevention drugs (PrEP or PEP): Oral versions require a three-month wait from the last dose. Injectable long-acting versions carry a two-year deferral from the last injection.
This isn’t an exhaustive list. Centers screen for dozens of medications, so always bring a current list of what you’re taking.
Tattoos and Piercings
A new tattoo or piercing can temporarily disqualify you, but the rules depend on where you got it done. If the work was performed in a state that regulates tattoo and piercing facilities and used single-use sterile equipment, many centers will accept you with no waiting period. If the state doesn’t regulate those facilities, or if a reusable instrument (like a piercing gun) was used, you’ll need to wait three months. The concern is bloodborne infections that might not show up on tests right away.
Travel to Malaria-Risk Areas
Travel to regions where malaria is common triggers one of the longer deferrals. If you visited a malaria-risk country, you’ll wait three months after returning. If you lived in one of those areas for more than five years, 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 stayed symptom-free during that entire period. The CDC maintains a list of affected countries that centers reference during screening.
Sexual Activity and HIV Risk Screening
The FDA overhauled its approach to sexual history screening in recent years, replacing older policies that singled out men who have sex with men. The current system uses the same individual risk-based questions for every donor regardless of sex or orientation.
The key triggers are having a new sexual partner in the past three months combined with anal sex during that same window, or having more than one sexual partner in the past three months combined with anal sex. Either scenario results in a three-month deferral from the most recent sexual contact. Anyone currently taking medication to treat HIV is permanently deferred, since the treatment can mask a positive test result.
Donation Frequency Limits
Even if you’re perfectly healthy, you can be turned away for donating too often. FDA regulations cap source plasma donation at twice per seven-day period, with at least one day between sessions. Centers track your visits in a national database, so donating at multiple locations to get around the limit will flag your account. Donating more frequently than allowed can deplete your body’s protein and fluid reserves, leading to fatigue, immune suppression, and chronically low protein levels that eventually disqualify you on their own.