Plasma donation centers screen every donor before each visit, and a surprisingly long list of factors can get you turned away, either temporarily or permanently. Some are straightforward (age, weight, vital signs), while others catch people off guard, like a recent tattoo, a medication you take daily, or travel to certain countries. Here’s a full breakdown of what can prevent you from donating.
Basic Age and Weight Requirements
You must be at least 18 years old and weigh at least 110 pounds. There’s no universal upper age limit set by the FDA, but individual donation centers may set their own caps, often around 65 or 69. The weight minimum exists because smaller bodies have less total blood volume, and removing plasma from someone with too little blood can cause dizziness, fainting, or worse.
Blood Pressure and Heart Rate Limits
Your vital signs are checked at every visit before you’re cleared to donate. FDA regulations set specific cutoffs: your systolic blood pressure (the top number) must fall between 90 and 180, and your diastolic (bottom number) must be between 50 and 100. Your pulse needs to be regular and between 50 and 100 beats per minute.
If you’re outside those ranges on a given day, you’ll be turned away for that visit. This doesn’t necessarily mean you’re permanently disqualified. Stress, caffeine, dehydration, or a hard workout beforehand can all push your numbers out of range temporarily. If you’re consistently outside these limits because of a chronic condition, though, you likely won’t qualify until it’s managed.
Conditions That Permanently Disqualify You
Some medical conditions result in a lifetime ban from donating plasma. These exist to protect both the recipient who will eventually receive a product made from your plasma and you as the donor. The major permanent disqualifiers include:
- HIV infection: Any positive test at any point in your life, or any history of taking HIV medication, disqualifies you permanently.
- Hepatitis B or C: A past infection or a positive test for either virus is a permanent deferral, even if you’ve cleared the virus.
- Blood cell cancers: Leukemia, lymphoma, and myeloma disqualify you even if you’re currently cancer-free.
- Congenital bleeding disorders: Conditions like hemophilia that affect how your blood clots are permanent disqualifiers.
Medications That Require a Waiting Period
Many common medications won’t stop you from donating, but several require you to wait a set period after your last dose. The concern is usually that traces of the drug in your plasma could harm a recipient, particularly a pregnant woman or developing fetus.
Isotretinoin, the acne drug sold under names like Accutane and Claravis, requires a one-month wait after your last dose. Finasteride, used for hair loss or enlarged prostate (sold as Propecia, Proscar, or Avodart), carries a six-month deferral.
Blood thinners are another common issue. Warfarin, heparin, and newer anticoagulants like apixaban and rivaroxaban require a seven-day wait. Anti-platelet medications vary more widely: some need just two or three days, while others like clopidogrel (Plavix) require a 14-day wait. If you take a blood thinner daily and can’t stop it, you’re effectively unable to donate.
Tattoos and Piercings
A recent tattoo or piercing can temporarily disqualify you, but the rules depend on where you got it. If your tattoo was done in a state that doesn’t regulate tattoo facilities, you’ll need to wait three months. In regulated states, many centers will accept you with no waiting period, since the infection risk from licensed, inspected shops is minimal.
Piercings follow a similar logic. If a reusable piercing gun or any reusable instrument was used, or if there’s any doubt about whether single-use equipment was involved, you’ll need to wait three months.
Pregnancy and Breastfeeding
You cannot donate plasma while pregnant. After giving birth, the general recommendation is to wait at least six months, though some centers ask you to wait until you’ve finished breastfeeding entirely. Pregnancy changes your blood volume, protein levels, and immune markers significantly, and your body needs time to fully recover before plasma collection is safe for you.
Travel to Malaria-Risk Areas
If you’ve recently traveled to a region where malaria is present, you’ll face a deferral. Most travelers must wait three months after returning before they can donate. The rules are stricter if you actually lived in a malaria-endemic area: former residents must wait three years. Anyone who has been diagnosed with and treated for malaria must also wait three years and remain symptom-free throughout that period.
The specific countries on the malaria-risk list shift over time as disease patterns change, so centers use CDC guidance to determine which destinations trigger a deferral. Common regions include parts of sub-Saharan Africa, South and Southeast Asia, and Central and South America.
Pre-Donation Screening Tests
Even if you meet every other requirement, you’ll have a small blood sample tested at the center before each donation. Staff check your hematocrit (the percentage of your blood made up of red blood cells) and your total protein levels. If either is too low, you’ll be deferred for that day. This is one of the most common reasons repeat donors get turned away, especially those who donate frequently, since your body needs time to replenish both red blood cells and the proteins removed with each plasma collection.
Eating iron-rich foods, staying well hydrated, and spacing your donations appropriately can help keep these levels in range. Most centers allow up to two donations per seven-day period, with at least one day between visits.
Recent Illness, Infections, and Antibiotics
Active infections, including something as common as a cold or the flu, will temporarily disqualify you. Most centers require you to be symptom-free and off antibiotics for a set period before donating. The logic is simple: if your immune system is fighting something, your plasma may contain pathogens, and your body is already under stress.
Individual Risk-Based Screening
The FDA updated its donor screening approach in 2023, moving away from group-based deferrals toward individual risk-based questions for HIV transmission risk. Rather than deferring entire demographic groups, donation centers now ask all donors the same set of behavioral questions about recent sexual partners and practices. This applies to all blood and plasma collection, including source plasma. The shift means some people who were previously deferred indefinitely may now qualify, while anyone, regardless of gender or orientation, who reports specific higher-risk behaviors within a recent window will be temporarily deferred.