Incidence, predictors and severity of adverse events among whole blood donors

BACKGROUND: Adverse events have been reported post blood donation. Donors might refrain from donating again due to such events which lowers the blood supply in collection centers. AIM: This study measured the incidence, predictors and severity of adverse events among donors of a single whole blood unit at one of the largest donation centers in Saudi Arabia. METHODS: A retrospective cohort was conducted in 2015 to investigate the adverse events immediately post donation. Donor characteristics such as age, blood pressure, hemoglobin level, weight and history of donation were described and tested as potential risk predictors. Eligible blood donors were 18,936/24,634 (76.8%). RESULTS: Incidence of adverse events found 1.1% (208 donors), of which 0.65% had mild symptoms (chills; nausea; pallor; dizziness; nervousness; headache), while 0.45% had severe symptoms (hypotension; convulsions; syncope; respiratory distress; emesis). Multiple logistic regression showed that, the incidence of adverse events was significantly higher among young age donors <30 years RR[95%CI] = 1.58[1.18–2.12], p < 0.002, higher hemoglobin levels RR[95%CI] = 1.30[1.15–1.46], lower weight donors <75kg RR[95%CI] = 1.71[1.29–2.27], p <0.001 and first time donors RR[95%CI] = 2.21[1.64–2.97], p < 0.001 compared to older age donors ≥30, lower hemoglobin levels, heavier weight donors ≥ 75, and previous donors, respectively. More severe adverse events were observed among older and heavier donors, previous donors, lower hemoglobin levels and hypertensive donors but with no statistical significance. CONCLUSION: Young blood donors, donors with lower weight and first time donors are at higher risk of contracting adverse events. Higher hemoglobin level is also a potential risk predictor of adverse events post whole blood donation.