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.
You can donate platelets once in a seven day period and up to 24 times a year. You must wait at least 72 hours after donating platelets before donating whole blood. After an automated double red cell collection, you must wait 112 days before donating again. In any eight (8) week period, you can make one blood donation and one platelet donation or six (6) platelet donations.