To donate plasma, you generally need to be at least 18 years old, weigh at least 110 pounds, and be in good overall health. Beyond those basics, you’ll go through a medical screening, provide identification, and meet several lifestyle and health criteria before your first donation. Here’s what the full process looks like.
Age, Weight, and General Health
The baseline requirements are straightforward. You must be 18 or older and weigh at least 110 pounds. You also need to pass a medical exam, which includes testing negative for hepatitis and HIV. If you have a fever above 99.5°F on the day of your visit, you’ll be turned away until it resolves.
Your iron levels also matter. Donation centers check your hematocrit, which measures the percentage of your blood made up of red blood cells. A level of at least 38% is generally considered the minimum. If yours falls below that threshold, you’ll be temporarily deferred until it comes back up.
What to Bring to Your First Visit
First-time donors need 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. That last one can be your actual Social Security card, a W-2 form, or a recent paystub. The name on your Social Security document must match your ID exactly, so double-check before you go.
Medications That Can Disqualify You
Blood thinners are the biggest category of disqualifying medications. If you take warfarin, heparin, rivaroxaban, apixaban, or similar anticoagulants, you cannot donate. The concern is straightforward: your blood won’t clot normally at the needle site, which creates a bleeding risk for you.
Aspirin is a gray area. It won’t necessarily prevent a standard plasma donation, but you need to wait at least two full days after taking aspirin or any aspirin-containing medication before donating platelets through apheresis, a related but different process. Over-the-counter pain medications in general can thin your blood, so it’s best to skip them before your appointment.
Antibiotics don’t automatically disqualify you, but they signal an underlying issue. If you have an active infection, you can’t donate. If you received antibiotics by injection, you’ll need to wait 10 days after your last injection before you’re eligible.
People taking PrEP or PEP to prevent HIV infection are also ineligible. These medications can delay HIV detection in the screening tests used at donation centers, which makes it impossible to confirm a safe donation.
Health Conditions and Deferrals
Some health conditions lead to a permanent deferral, while others require a waiting period. Blood cancers like leukemia, lymphoma, and Hodgkin’s disease permanently disqualify you. Other types of cancer are acceptable as long as treatment ended more than 12 months ago with no recurrence since.
Heart conditions come with a six-month waiting period. That applies after a heart attack, bypass surgery, angioplasty, an episode of angina, or any change in your heart condition that required a medication adjustment. If you have a bleeding disorder that prevents your blood from clotting normally, you’re permanently ineligible.
Tattoos, Piercings, and Waiting Periods
The rules around tattoos have loosened in recent years. In most states, a tattoo done at a state-regulated facility using sterile, single-use needles and fresh ink is immediately acceptable. The same applies to cosmetic tattoos and microblading, as long as the work was done at a licensed establishment following the same sterile protocols. If you got your tattoo in a state that doesn’t regulate tattoo facilities, you’ll need to wait three months.
Piercings follow a similar logic. If the piercing was done with single-use, disposable equipment (both the gun and the earring cassette), you’re fine to donate right away. If a reusable instrument was used, or if you’re not sure, the wait is three months.
Updated Screening for Sexual History
The FDA overhauled its approach to donor screening in 2023, moving away from blanket deferrals based on sexual orientation. Instead, all potential donors are now assessed using individual risk-based questions regardless of sex or gender. This means the screening focuses on specific recent behaviors rather than categorically excluding groups of people. The FDA has proposed expanding this same individual assessment approach to tissue and cell donors as well.
How to Prepare Before Your Appointment
Plasma is about 90% water, and a single donation removes roughly 800 milliliters (about 32 ounces) of fluid from your body. To offset that loss, aim to drink at least 32 ounces of water in the two to three hours before your appointment. More broadly, try to get six to eight cups of water or juice both the day before and the day of your donation.
What you eat matters too. Focus on meals rich in protein and iron in the days leading up to your visit. Avoid heavy, greasy food right before donating, as it can cause nausea or lightheadedness during the process. Skip coffee, alcohol, and other caffeinated drinks while you’re hydrating, and avoid smoking before your appointment. These steps don’t just help you feel better during the donation. They also improve the quality of the plasma you’re giving, which matters because it’s often used to manufacture treatments for people with immune deficiencies and other serious conditions.