Most healthy adults who are at least 18 years old and weigh at least 110 pounds can donate plasma. But eligibility goes well beyond those basics. Donation centers check your vital signs, protein levels, medical history, medications, travel history, and more before every session. Here’s what determines whether you’ll qualify.
Basic Age, Weight, and Health Requirements
You must be 18 or older and weigh at least 110 pounds. At your first visit, and periodically after that, the center performs a physical exam that includes listening to your heart and lungs, checking your abdomen for organ enlargement, testing your reflexes and coordination, and examining your skin and lymph nodes in the neck, underarms, elbows, and groin. Staff also check your urine for sugar and protein.
Before every donation, the center measures your temperature (which needs to be around 99.5°F or lower), blood pressure, and pulse rate, which should fall between 50 and 100 beats per minute. You also get a finger stick to check your hemoglobin or hematocrit, which measures how much of your blood is made up of red blood cells. Men need a hematocrit of at least 39 percent; women need at least 38 percent, though some centers accept slightly lower values with extra safety steps. Your total plasma protein level also gets tested each time and must fall between 6.0 and 9.0 grams per deciliter, a range that confirms your body has enough protein to safely give plasma and recover.
Medical Conditions That Affect Eligibility
Some conditions permanently disqualify you from donating. These include hemophilia and other clotting factor deficiencies, chronic kidney disease or dialysis, cirrhosis, and certain chronic infections. Conditions involving abnormal iron storage in the blood also fall into this category.
Other conditions only pause your eligibility temporarily. A cancer diagnosis defers you for five years after completing treatment. Tuberculosis requires a two-year wait after treatment ends. Hepatitis A means a four-month deferral from diagnosis. If you tested positive for COVID-19, the wait is 14 days from your positive test or until symptoms resolve, whichever comes later. A diagnosis of Zika virus defers you for four weeks after symptoms clear up.
If you’ve received a kidney transplant, you’ll wait three months. If you donated bone marrow, you’re deferred for eight weeks from the harvest date. And if you’ve ever been diagnosed with Ebola, the deferral is one year from recovery.
Medications That Require a Waiting Period
Blood thinners are the most common medication-related issue. If you take any oral anticoagulant, you typically need to be off it for seven days before donating. Anti-platelet medications have varying wait times ranging from two days to one month depending on the specific drug.
Isotretinoin, the active ingredient in acne medications like Accutane, requires a one-month waiting period after your last dose. Finasteride, used for hair loss or prostate symptoms, carries a six-month deferral. Certain immunosuppressants require a six-week wait.
If you take oral PrEP or PEP for HIV prevention, the deferral is three months. Injectable forms of these medications carry a two-year wait. Some medications used for cancer, multiple sclerosis, or psoriasis defer you for two to three years, and in rare cases indefinitely. If you’re on any prescription medication and aren’t sure, bring your medication list to the center. They’ll tell you on the spot.
Tattoos, Piercings, and Lifestyle Factors
If you got a tattoo at a licensed parlor using sterile equipment, you can donate immediately. If the tattoo was self-applied, done outside the country, or done in a state that doesn’t license tattoo parlors, you’ll need to wait three months. The same logic applies to piercings: sterile, single-use equipment at a professional shop means no deferral, but self-piercings trigger a three-month wait. Body branding also carries a three-month deferral.
A history of intravenous drug use is a permanent deferral. If you’ve received a blood transfusion or blood products within the past 12 months, you’ll be deferred as well.
Travel to Malaria-Risk Areas
If you’ve traveled to an area where malaria is present, you cannot donate plasma for three months after your return. If you previously lived in a malaria-endemic region, the wait extends to three years. And if you were actually diagnosed with malaria, you’re deferred for three years after completing treatment, provided you’ve remained symptom-free during that entire period. The donation center will ask about recent international travel during your screening, and the CDC maintains the list of countries that trigger these deferrals.
What Happens at Your First Visit
Expect your first appointment to take significantly longer than future visits, often two to three hours. You’ll fill out a detailed medical history questionnaire covering past illnesses, surgeries, medications, travel, sexual history, and potential exposure to infectious diseases. Then comes the physical exam and the finger-stick blood test. If everything checks out, you’ll donate that same day.
On return visits, the process is faster. You’ll answer a shorter health screening, get your vitals checked, and have your protein and hematocrit levels tested before each session.
How to Prepare Before Your Appointment
Plasma donation removes about 800 milliliters (roughly 32 ounces) of blood volume. Drinking at least that much water two to three hours before your appointment helps your body handle the loss and can make the process go more smoothly. In the days leading up to your donation, focus on eating foods rich in protein and iron, like lean meat, eggs, beans, and leafy greens. Cut back on alcohol and caffeine, both of which can dehydrate you.
Bring a valid photo ID to your first visit. Most centers also require proof of your Social Security number and current address. Check with your specific center ahead of time, as documentation requirements can vary slightly between companies.