Medical certificates are sometimes required to obtain certain health benefits from an employer, to make an insurance claim, for tax purposes, or for certain legal procedures. Medical certificates are used to indicate eligibility of activity, such as the use of disabled parking. Medical certificates can also be used to describe a medical condition a person has, such as blindness. Medical certificates are often used to certify that someone is free of contagious diseases, drug addiction, mental illness, or other health issues.
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. 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.[6] 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.