The INTERVAL study has been set up by the Universities of Cambridge and Oxford in collaboration with NHS Blood and Transplant.

We would like to recruit 50,000 blood donors for a study which aims to compare different intervals between blood donations (INTERVAL). Our goal is to find the optimum interval for which it is safe for different donors to give blood.

We will look at whether intervals should be tailored to donors by age, gender, genetic profile and other characteristics. The study’s findings should help to improve the well-being of blood donors in England and enhance the country’s blood supplies.