Are waivers granted for any of the medical requirements?
No, NASA does not grant waivers for the medical requirements. When qualifying astronauts for space flight, NASA must look at not only what is required for normal Shuttle operations, but also what each astronaut would require should serious, even life threatening, problems develop. For maximum crew safety, each crewmember must be free of medical conditions that would either impair the person’s ability to participate in, or be aggravated by, space flight, as determined by NASA physicians.
