The NCAA, and some non-NCAA schools, require all student-athletes to be tested for sickle cell anemia or sign a waiver where they accept the risk of not being tested for it. Some schools also require a TB skin test or a waiver for this. Not all schools will allow you to sign a waiver. Most doctors will be surprised that you ask to take such tests, as these conditions are very rare.

If you are told by your school to be tested for sickle cell anemia or have a TB skin test, ask if it is possible to sign a waiver or be tested once you arrive at the school. It is much easier to be tested in the United States as it can be difficult/expensive to get tested outside of the US. If it is not possible, then you must go to the GP and explain to them that you must take proof of blood testing to show that you have/do not have sickle cell anemia/TB. If your GP cannot run these tests, you may have to research to find a local clinic to run these tests for you. They can be done outside of the US, it just may take some searching.