Blood Donation Eligibility Estimator

Blood donation eligibility depends on dozens of criteria that vary by country and by individual blood center -- medical history, medications, recent tattoos or piercings, pregnancy, and more -- far more than any simple calculator can capture. This tool provides an educational estimate based on just three of the most common screening factors: hemoglobin level, age, and recent travel to a malaria-endemic region. Hemoglobin is checked because donation removes roughly a pint of blood, and donors need a baseline level high enough to tolerate that loss safely; most blood centers require at least 12.5 g/dL, sometimes higher for female donors at some centers. Age matters because most programs set a general donor age window (commonly 16-17 with parental consent up through the mid-60s to low-70s, varying by center) to balance donor safety against supply needs.

Travel to a malaria-risk region typically triggers a temporary deferral period -- often three months to a year depending on the destination and the individual blood center's policy -- because malaria parasites can persist in the blood without symptoms and aren't part of routine donor screening panels. The score starts at a baseline of 50 points, adds points for hemoglobin and age falling within typical acceptable ranges, and subtracts points for recent malaria-risk travel, producing a 0-100 estimate. Because actual donor criteria vary by country, region, and individual blood center policy, and because this calculator checks only three of many real screening factors, always confirm actual eligibility with your local blood donation center rather than relying on this score alone.