Several things can stop you from donating plasma, ranging from basic requirements like age and weight to permanent disqualifications tied to specific infections or blood disorders. Some restrictions are temporary, meaning you just need to wait a set period before you’re eligible. Others are lifelong. Here’s a breakdown of every major category that could keep you from the donation chair.
Basic Eligibility Requirements
You must be at least 18 years old and weigh at least 110 pounds. Falling below either threshold is an automatic disqualification. You’ll also need to provide valid identification and proof of residency, though the exact documents accepted vary by facility. Before your first donation, you’ll go through a medical exam, a health history screening, and lab testing. Each of these checkpoints can flag issues that delay or prevent donation.
Permanent Disqualifications
Certain diagnoses result in a lifetime ban from donating plasma. These are conditions where the risk of transmitting disease or compromising the plasma supply is too high, regardless of current health status or treatment.
- HIV infection: Any person who has ever tested positive for HIV or taken any medication to treat HIV is permanently ineligible. While “undetectable equals untransmittable” applies to sexual transmission, this principle does not apply to transfusion. Antiretroviral drugs don’t fully eliminate the virus from the body, and donated plasma from someone with HIV could still transmit the infection to a recipient.
- Hepatitis B or C: Anyone who has ever had viral hepatitis or tested positive for hepatitis B or C cannot donate.
- Blood cell cancers: Leukemia, lymphoma, and myeloma result in permanent deferrals, even if you are cancer-free.
- Congenital bleeding disorders: Conditions like hemophilia permanently disqualify you.
Temporary Deferrals
Many common situations only pause your eligibility for a set waiting period. Once that window passes and you’re otherwise healthy, you can donate again.
Tattoos and piercings. In most U.S. states, you can donate immediately after getting a tattoo at a licensed parlor. However, a three-month deferral applies if you got the tattoo in Georgia, Idaho, Maryland, Nevada, New York, Pennsylvania, Utah, Vermont, Wyoming, the District of Columbia, U.S. territories, certain Massachusetts municipalities, or any other country. Body piercings follow similar logic: three months of waiting unless the piercing was done under verified sterile conditions.
Travel to malaria-risk areas. If you’ve traveled to a region where malaria is present, you’re deferred for three months after your return. Former residents of those areas face a longer wait of three years. If you were actually diagnosed with malaria, the deferral is three years from the end of treatment, provided you’ve remained symptom-free the entire time.
Surgery and serious injury. Major procedures or significant injuries trigger a deferral, but the length depends on the specifics. Most donation centers evaluate these on a case-by-case basis.
Low Hemoglobin and Protein Levels
Before each donation, staff will test a small sample of your blood for hemoglobin, the protein in red blood cells that carries oxygen. Women need a minimum level of 12.5 g/dL, and men need at least 13.0 g/dL. If your level falls below the cutoff, you’ll be turned away that day. Hemoglobin that’s unusually high (above 20.0 g/dL) also disqualifies you. Donation centers also check your total protein levels to make sure your body can safely spare the plasma, though specific thresholds vary by facility.
Low hemoglobin is one of the most common reasons people get turned away unexpectedly. Iron deficiency is the usual culprit, and it’s especially common in frequent donors and people who menstruate. Eating iron-rich foods like red meat, spinach, and fortified cereals in the days before your appointment can help keep your levels in range.
Medications That Disqualify You
Certain medications create deferral periods because they either pose a risk to whoever receives your plasma or indicate an underlying condition that disqualifies you. Isotretinoin (commonly known by the former brand name Accutane), used for severe acne, typically requires a one-month waiting period after your last dose. Blood thinners, certain acne and hair-loss drugs, and some immunosuppressants also carry deferral periods of varying lengths. Antiretroviral medications for HIV are a permanent disqualifier, not because of the drug itself but because of the underlying infection.
If you take any prescription medication, bring it up during your screening. Over-the-counter pain relievers like ibuprofen or acetaminophen generally don’t affect eligibility, but aspirin can matter if the plasma is being used for platelet products.
How Often You Can Donate
Even if you meet every eligibility requirement, donation frequency is regulated. Federal guidelines allow a maximum of two plasma donations in any seven-day period, with at least two days between sessions. If you show up too soon after your last visit, the center will turn you away regardless of how you feel. These limits exist because your body needs time to replenish the proteins and fluid lost during each session. Trying to donate more frequently than allowed can lead to drops in your protein and hemoglobin levels, which would then disqualify you at future screenings.
Day-of Factors That Get You Turned Away
Some disqualifications only apply on the day you show up. If you have a fever, cold symptoms, or any active infection, you’ll be deferred until you’ve recovered. Elevated or unusually low blood pressure and pulse readings outside the acceptable range will also stop you. Dehydration is another common reason for same-day rejection, since it can make your veins harder to access and concentrate your blood values in misleading ways. Drinking plenty of water and eating a solid meal in the hours before your appointment reduces the chance of an unexpected deferral.
Visible signs of intravenous drug use, such as track marks, result in permanent disqualification. Appearing intoxicated from alcohol or drugs at the time of your appointment will also get you turned away.
Recent FDA Policy Changes
The FDA has shifted toward individual risk-based screening questions rather than blanket deferrals for certain groups. This change applies to blood and plasma collection, including source plasma. Instead of automatically disqualifying donors based on broad demographic categories, donation centers now ask specific behavioral questions designed to assess each person’s individual risk of transmitting HIV. The practical result is that some people who were previously ineligible under older blanket policies may now qualify, depending on their answers to the updated questionnaire.