I have Masters degree with Distinction and Student of the Year Prize in Corrosion of Engineering Materials from Imperial College London, first degree in Chemistry from University of Central Lancashire and also did Technology, Material Science and Engineering and Mathematics from the Open University.
In areas where tattooing is not as closely monitored, people are asked to wait for 12 months to give blood after getting a tattoo. This waiting period ensures that the donor is free of any potential blood-borne diseases which could have been passed on unsanitary equipment.
The minimum period between whole blood donations is 56 days, but for many donors it can be much longer. Because a lot can happen between donations, we are required to treat every donation as a separate event. For the safety of the blood supply and potential blood recipients, we have to take maximum caution and ask the questions every time.