​pre-employment health screening is an exam usually performed by a health care professional to determine if an employee is medically fit for the job and the specific duties required. The pre-employment exam may include a routine history and physical, drug screening and/or complete lab work. Employees may also be required to perform physical ability tests to measure their ability to perform a particular task. The purpose is to determine where the employee can be placed to function at his or her best without risk of injury. Blood test results and other clinical information can also be used to establish a baseline at the start of employment. This information can be used to evaluate changes in health status that may occur later on.