This NASA Technical Standard establishes the medical requirements and clinical procedures necessary to ensure the health, safety, and long-term occupational performance of NASA career astronauts. It is used during astronaut selection as well as for annual recertification. The standard reflects the medical criteria needed to successfully complete specific mission tasks and the multifaceted training and performance demands placed on astronauts. These demands include, but are not limited to, operating high‑performance aircraft; exposure to hypobaric and hyperbaric conditions; exposure to unique environments (e.g., microgravity, 1/6 g, high g‑forces); and conducting specialized operations (e.g., extravehicular activities, robotic arm operations).
