Eligibility rules vary by country and by blood service, but many principles are common: donors must be in good general health, above a minimum age and weight, and free of recent infections or high-risk behaviours. Here’s a breakdown of frequent questions and how they are typically handled.
Temporary deferrals
Common temporary deferrals include recent illness (fever), recent tattoo or piercing (varies by jurisdiction), certain vaccinations, and recent international travel to areas with malaria or other infections. Waiting periods can range from weeks to months depending on the specific risk.
Medications and chronic conditions
Many medications do not permanently disqualify donors, but some medications require a temporary wait or permanent deferral. Chronic conditions such as diabetes or controlled hypertension may be acceptable if well-managed — the screening staff will assess each case. Always disclose medications and medical history during screening.
Pregnancy and breastfeeding
Pregnancy is typically a deferral until after delivery and recovery; breastfeeding rules vary by country. Women planning pregnancy should consult their local blood service for guidance.
High-risk behaviours
Sexual behaviours and injection drug use that increase infection risk are treated carefully by blood services and may lead to temporary or permanent deferral depending on the activity and timing. These policies protect recipients and vary by jurisdiction.
If you’re unsure, contact your local blood service — honest disclosure during screening protects everyone. Many deferrals are temporary and donors can return when it’s safe to do so.