<P> Health criteria are often required when making an application for something, such as an eye examination to get a driver's license . Other times medical criteria are presented voluntarily by an applicant in a self - assessment, without either a doctor or access to the person's medical record . Specific health criteria or medical history are required for certain jobs . </P> <P> In the United States, most aviators are required to possess a valid medical certificate that certifies sound health as part of the requirements for piloting an airplane or helicopter . While airman certificates are issued for life, the medical certificate expires and must be renewed periodically in order continue flying privileges . Sport pilots may use a valid state driver's license in place of a medical certificate, and glider and hot air balloon pilots are not required to obtain them . </P> <P> The term aegrotat (abbreviated as aegrot) is used primarily in the United Kingdom and Commonwealth of Nations . In the context of British undergraduate degrees a student who is too ill to finish may be awarded an aegrotat degree if the student otherwise would have passed exams or other requirements . </P> <P> Except in certain unique circumstances, a holder of a medical certificate in the National Aeronautics and Space Administration may not "act as pilot in command or in any other capacity as a required flight crewmember of an aircraft". </P>

When do i need to produce a medical certificate