To donate plasma, you need to be at least 18 years old, weigh at least 110 pounds, and be in generally good health. You’ll also need to bring specific identification documents and pass a medical screening on the day of your visit. Beyond those basics, certain medications, recent tattoos, and chronic health conditions can affect your eligibility.
Age, Weight, and Health Basics
The baseline requirements are straightforward. You must be 18 or older and weigh at least 110 pounds. Your weight matters not just for eligibility but also for how much plasma gets collected: donors between 110 and 149 pounds have about 625 mL drawn, while those 175 pounds and above can have up to 800 mL collected per session.
You also need to be in good general health, which the donation center evaluates through a medical exam and health questionnaire at your first visit. This includes testing negative for hepatitis and HIV. If you’ve had either infection, you won’t be eligible to donate.
What to Bring With You
First-time donors need three documents:
- Government-issued ID, such as a driver’s license, passport, or state ID card
- Proof of address, like a driver’s license or utility bill
- Proof of Social Security number, such as a Social Security card, W-2 form, or paystub. The name on this document must match your ID exactly
A driver’s license can cover both the ID and address requirements, but you’ll still need a separate document showing your Social Security number.
The Pre-Donation Screening
Every time you donate, you go through a quick health check before the actual collection begins. Staff will measure your blood pressure, pulse, and temperature. They’ll also do a finger prick to check two key values: your hematocrit (the percentage of red blood cells in your blood) and your total protein level.
For hematocrit, the minimum is 38 percent for men and 36 percent for women. If your levels fall below that threshold, you’ll be turned away for the day. Total protein is also checked, and low levels are a common reason people get deferred. This is why eating protein-rich foods before your appointment matters, not just for how you feel afterward but for whether you’ll pass the screening at all.
Medications That Delay or Prevent Donation
Most everyday medications, like over-the-counter pain relievers, allergy pills, and common antibiotics, won’t disqualify you. But several categories of prescription drugs trigger a waiting period or permanent deferral.
Blood thinners require a pause. Depending on the specific medication, you’ll need to wait anywhere from 2 days to a full week after your last dose. Warfarin, for example, requires a 7-day wait.
Isotretinoin, the prescription acne medication sometimes known by the brand name Accutane, carries a 1-month deferral. Hair loss treatments containing finasteride or dutasteride require a 6-month wait. Medications taken to prevent HIV (PrEP or PEP) defer you for 2 years, and any medication used to treat an active HIV infection results in a permanent deferral.
Certain drugs prescribed for psoriasis, multiple sclerosis, or rheumatoid arthritis also carry long deferrals ranging from 2 to 3 years, and some result in permanent disqualification. If you’re taking any prescription medication, mention it during your screening. The center will let you know whether it affects your eligibility and for how long.
Tattoos, Piercings, and Travel
A recent tattoo doesn’t necessarily disqualify you. If it was done at a licensed tattoo parlor using sterile technique, you’re eligible immediately. But if the tattoo was self-applied, done by a non-professional, applied outside the country, or done in a state that doesn’t license tattoo parlors, you’ll need to wait 3 months.
The same logic applies to piercings. Sterile, single-use equipment at a professional shop means no waiting period. A self-piercing or one done without sterile equipment triggers a 3-month deferral.
Travel to regions where malaria is common requires a 3-month wait before you can donate. If you’ve actually had malaria, the deferral extends to 3 years.
How to Prepare the Day Before
What you eat and drink in the 24 hours before your appointment directly affects whether you pass the screening and how you feel during and after donation. The process removes roughly 800 milliliters (about 32 ounces) of fluid from your body, so hydration is critical. Aim for six to eight cups of water or juice both the day before and the day of your donation, and try to drink at least 32 ounces in the two to three hours leading up to your appointment.
Focus on protein-rich and iron-rich foods in the meals before you donate. Eggs, lean meat, beans, nuts, and spinach all help keep your total protein and hematocrit levels in the acceptable range. Skipping meals or showing up dehydrated is one of the most common reasons donors get deferred at the screening stage.
What Happens After You Donate
Plan to sit in the recovery area for at least 15 minutes after your session. For the rest of the day, avoid heavy lifting, vigorous exercise, and working at heights. Any activity where fainting could lead to injury should be avoided for a full 24 hours. If you’re an athlete, wait at least 12 hours before resuming strenuous training, and don’t donate on the same day as a competition or hard practice.
If you feel dizzy or lightheaded at any point after leaving the center, sit or lie down right away and don’t get back to your normal routine until the symptoms fully resolve.