Population
Blood donors with treated hypertension or type 2 diabetes (16 studies).
Intervention
Systematic review to ascertain the evidence for safety of blood donation by blood donors with treated hypertension or type 2 diabetes.
Comparison
Outcome
None of the identified studies directly addressed the review questions and methodological appraisal highlighted a number of deficiencies. All included papers provided contributory data and the findings were consistent. No study found any evidence of increased risk to homologous (allogeneic) or autologous blood donors with treated hypertension or with raised baseline systolic blood pressure up to 200 mmHg. Very few data relating to blood donation by diabetic subjects was found.