To donate plasma in the United States, you need to be at least 18 years old, weigh at least 110 pounds, and pass a health screening on the day of your appointment. Beyond those basics, eligibility depends on your medical history, any medications you take, recent travel, and the results of a quick physical check at the donation center.
Basic Age, Weight, and ID Requirements
The minimum age is 18, and you must weigh at least 110 pounds. There is no upper age limit set by federal regulation, though individual centers may have their own policies.
For your first visit, you’ll need to bring three things: a government-issued photo ID, proof of your current address (a driver’s license or utility bill works), and proof of your Social Security number, such as a Social Security card, W-2, or pay stub. The name on your Social Security document must match your ID exactly. If there’s a mismatch, you’ll be turned away until you can provide matching documents.
What Happens During the Day-of Screening
Every time you show up to donate, staff will check your vital signs before you’re cleared. Federal regulations set specific cutoffs:
- 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.
- Hemoglobin or hematocrit: For men, hemoglobin must be at least 13.0 g/dL (or hematocrit of 39%). For women, the minimum is 12.5 g/dL (or hematocrit of 36%), with some centers accepting as low as 12.0 g/dL under an FDA-approved alternative process.
If your blood pressure is temporarily high because you rushed to get there, or your hemoglobin dips below the threshold, you won’t be permanently disqualified. You simply can’t donate that day and can try again at your next appointment. Staying hydrated and eating an iron-rich meal beforehand can help you pass the screening consistently.
Infectious Disease Testing
Your blood sample will be tested for a panel of infections every time you donate. The FDA requires screening for HIV, hepatitis B, hepatitis C, syphilis, and several less common infections including West Nile virus, Zika virus, Chagas disease, babesiosis, and HTLV (a virus that affects immune cells). Testing positive for any of these will disqualify you, and the center is required to notify you of the result.
First-time donors undergo a more thorough medical history questionnaire that covers past infections, surgeries, and risk factors. Return donors answer a shorter version at each visit.
Medications That Affect Eligibility
Many common medications are fine, but several categories carry mandatory waiting periods. These deferrals exist either because the drug could harm a patient who receives your plasma or because taking the medication signals an underlying condition that makes donation unsafe.
- Blood thinners: Most newer oral blood thinners (like apixaban or rivaroxaban) require a 2-day wait after your last dose. Warfarin and heparin require 7 days.
- Isotretinoin (severe acne medication): 1 month after your last dose.
- Finasteride or dutasteride (hair loss or prostate medications): 6 months.
- Oral HIV prevention drugs (PrEP): 3 months after stopping. Injectable forms like cabotegravir require a 2-year wait.
- Psoriasis medications like acitretin: 3 years.
- Any experimental or investigational medication: 12 months.
If you’re unsure about a specific medication, bring the name and dosage to your screening appointment. The staff will check it against a standardized deferral list.
Tattoos, Piercings, and Temporary Deferrals
A recent tattoo can delay your eligibility. If you got your tattoo in a state that regulates tattoo facilities (most states do), you’re typically fine to donate right away. If the state doesn’t regulate tattoo shops, you’ll need to wait three months. The same three-month rule applies to piercings done with a reusable gun or any instrument that wasn’t clearly single-use.
Other temporary deferrals include recent illness with a fever (wait until you’ve been symptom-free), certain vaccinations, and pregnancy (you’ll typically need to wait six weeks after delivery). A recent blood transfusion also triggers a waiting period.
Travel to Certain Regions
If you’ve recently traveled to parts of the world where malaria is common, you’ll face a three-month deferral from the date you returned. This includes parts of India, sub-Saharan Africa, Central and South America, the Caribbean, the Philippines, and certain areas of Mexico and China. The CDC maintains updated malaria risk maps that donation centers reference.
The rules are stricter if you actually lived in a malaria-risk country rather than just visiting. Former residents must have lived in a non-endemic area for three full years, without any return trips to a malaria-risk region, before they’re eligible. Travel to Caribbean islands also raises concern for infections like chikungunya and Zika, which may trigger additional screening questions or short deferrals.
How Often You Can Donate
Plasma donation uses a process called apheresis, where a machine draws your blood, separates out the plasma, and returns the red blood cells to your body. Because you’re keeping your red blood cells, the recovery time is much shorter than a whole blood donation. Most commercial plasma centers allow you to donate up to twice per week, with at least one day between appointments. Your body typically replenishes its plasma within 24 to 48 hours.
That said, frequent donation can still take a toll. Some regular donors experience fatigue, lightheadedness, or drops in their total protein levels over time. If your screening numbers start falling below the required thresholds, the center will defer you until your levels recover. Eating protein-rich meals and drinking plenty of water on donation days helps you stay eligible long-term.