Recommendations on medical surveillance and biological monitoring for workers exposed to substances regulated by OSHA were summarized to provide guidance for physicians. A literature search for medical screening requirements or biological monitoring techniques for OSHA regulated substances or their metabolic products was performed. Sources were identified which discussed or recommended tests for most of the substances regulated by OSHA. Fifteen books and monographs that discussed or recommended medical tests or biological monitoring methods for OSHA regulated substances were examined for medical surveillance requirements. These sources included NIOSH documents, OSHA's Code of Federal Regulations, and individual texts. Each of the data sources was reviewed, and a brief description of the contents of each was provided. A list was provided of the location of OSHA medical screening requirements in the Code of Federal Regulations. Over 200 OSHA regulated substances were tabulated, listing the name of the substance, the Chemical Abstracts Service registry number, NIOSH/OSHA criteria, and recommended medical tests.