Temporary vs. permanent plasma deferrals explained
Temporary deferrals have an end date. Permanent deferrals don't. That's the core of it.
If you got deferred at your last visit and you're wondering whether you can ever come back, the answer depends entirely on which category you fell into. Here's how to tell them apart, what specific situations fall into each bucket, and what your next steps look like.
What a deferral actually is
A deferral means you're not eligible to donate at that moment. It does not always mean you're done forever. When the screening team at your center finds something that disqualifies you for a session, they mark you as deferred and let you know - sometimes with a specific return date, sometimes with a condition you need to meet first.
One thing donors don't always realize: the industry shares deferral information. The National Donor Deferral Registry (NDDR) is an industry-wide database managed by the PPTA (Plasma Protein Therapeutics Association) that tracks donors who have been permanently disqualified. Centers check the NDDR before each donation. If your deferral is permanent and you try a different chain across town, they'll find it.
Temporary deferrals: the full picture
Temporary deferrals are the more common outcome by a wide margin. They cover situations where something about your health or recent history needs time to resolve before your plasma is safe to collect or safe for you to give.
Same-day deferrals (usually resolved by next visit)
Low hematocrit: most centers require a minimum of 38% for women, 39% for men. If you fall short, you're sent home for that session. The fix is usually diet-based - eat iron-rich foods in the days before your appointment, and pair plant-based iron sources with vitamin C, which significantly boosts non-heme iron absorption.
Blood pressure out of range: acceptable range at most centers runs roughly 90/50 to 180/100 mmHg. A single high reading can get you sent home. Try arriving calm, well-hydrated, and without caffeine in the two hours before screening.
Elevated heart rate or irregular pulse
Visible illness, fever, or active infection symptoms
Dehydration - a dry venipuncture or low-quality plasma can get you cut before collection starts
Weight under 110 lbs (the FDA-mandated minimum for source plasma donors)
Days to weeks
Cold, flu, or COVID-19: most centers ask you to wait until symptoms have fully resolved, often with a 7-14 day post-recovery window
Minor localized infections or active skin conditions at or near the venipuncture site
Dental procedures: typically a 24-72 hour deferral depending on whether work was surgical
Antibiotics: most centers defer you until you've completed the course, plus a short waiting period (often 3-7 days post-course) to clear the medication from your system
Weeks to months
Tattoos: 3-6 months at most centers. Some chains, including CSL Plasma, enforce a uniform 4-month window regardless of how fast the tattoo healed. The logic is the window period for bloodborne infections - hepatitis B, C, and HIV may not be detectable immediately after exposure through a contaminated needle, so the waiting period ensures the test can actually catch anything that was transmitted.
Piercings: similar reasoning, typically 3-4 months
Pregnancy: you're deferred throughout pregnancy, and most centers require 6-12 months postpartum before returning, including for the duration of breastfeeding
Recent travel to high-risk areas for malaria or Zika: typically 3 months post-travel
Recent surgery or hospitalization: return timeline depends on what the procedure was and how recovery is going - the center's medical staff will evaluate your status
Live vaccines (MMR, varicella, yellow fever): typically a 2-4 week deferral after receiving them. Inactivated vaccines usually have no deferral period.
Medication deferrals (variable duration)
Most medications don't trigger a deferral. The ones that do fall into a few categories: medications that could harm a plasma recipient, medications that signal an underlying condition, and medications that affect your own safety during donation.
Isotretinoin (Accutane) carries a deferral period because it can cause severe birth defects if the plasma reaches a pregnant recipient. Etretinate (the older brand Tegison) is actually a permanent disqualifier. Insulin derived from bovine sources is another example that affects recipient safety. Blood thinners and anticoagulants may affect your safety during donation. Some antidepressants and antipsychotics carry deferrals not because of direct harm, but because they signal the presence of a treated condition the center needs to evaluate.
If you're on any prescription medication, bring the name and dosage to your screening. The medical staff runs through your current list every visit and can tell you whether it's an issue.
Permanent deferrals: what puts you on the NDDR
Permanent deferrals are uncommon, but they're final. Once entered into the NDDR, you cannot donate at any NDDR-participating center in North America. The major causes:
Confirmed positive for HIV - this is the clearest example of a permanent deferral and goes directly into the NDDR
Confirmed positive for Hepatitis B surface antigen (HBsAg) - same outcome
Confirmed reactive nucleic acid test for Hepatitis C - same outcome
History of intravenous drug use - most chains permanently defer donors with a history of injecting drugs not prescribed by a physician
Etretinate (Tegison) - even donors who stopped taking it decades ago remain permanently deferred due to the drug's persistence in body tissue and birth defect risk to plasma recipients
Certain serious medical conditions - including some cancers, a confirmed history of Creutzfeldt-Jakob disease (CJD), and select cardiac conditions
One thing worth knowing: some conditions that were treated as permanent have been revised as research has improved. The FDA lifted geography-based deferrals for people who lived in parts of Europe during certain years related to variant CJD in 2022. The long-standing time-based deferral for men who have sex with men (MSM) has shifted to an individual risk-assessment model. The rules are not static - if you were deferred years ago for a reason that may have since changed, it's worth looking into your specific situation.
Indefinite deferrals: the third category
There's a middle ground that doesn't get discussed as often: indefinite deferrals. These apply when the end date isn't a fixed waiting period but depends on a condition being resolved. If a test came back reactive but not definitively confirmed, you might be asked to follow up with your own physician and bring documentation before returning. The deferral lifts when the condition is addressed, not after a set number of days. This is different from both a temporary deferral (fixed timeline) and a permanent one (no path back).
If you've been permanently deferred
If you believe a permanent deferral was entered in error, you can contact Cieloworks - the NDDR's independent administrator - using the Information for Donors form on the PPTA website. Cieloworks can tell you which company entered you into the registry. The PPTA itself has no access to the NDDR and cannot advocate on your behalf, and neither can individual center staff. The path to disputing an NDDR entry runs through Cieloworks and ultimately the company that submitted it.