The page at https://www.ons.org/faq/medical-surveillance is no longer there, only the sample questionnaire at https://www.ons.org/sites/default/files/Safe%20Handling%20Medical%20Surveillance%20Questionnaire.pdf
I couldn't retrieve it via the Wayback Machine. There was an older version (the following) but it refers to the 2011 ONS Safe Handling edition which has since been updated to the 2017 edition (that has the chapter "Medical Surveillance of Healthcare Workers Handling Hazardous Drugs") at https://ebooks.ons.org/book/safe-handling-hazardous-drugs-third-edition
What are the medical surveillance recommendations for handlers of hazardous drugs?
The ONS Safe Handling of Hazardous Drugs (2011) text outlines the recommended components of a medical surveillance program including a thorough medical, reproductive and work history, physical exam, and laboratory studies including the following: CBC, reticulocyte count, AST, ALT and Alkaline phosphatase, urine microscopy or dipstick for blood. It also discusses biologic monitoring if specific exposures are being monitoring for. There is rationale included for each component of the surveillance process.
The National Institute for Occupational Safety and Health (NIOSH), which is within the Centers for Disease Control (CDC) published recommendations entitled Medical Surveillance for Healthcare Workers Exposed to Hazardous Drugs (http://www.cdc.gov/niosh/docs/wp-solutions/2013-103/pdfs/2013-103.pdf). Within this document are a listing job titles that may involve exposure to hazardous drugs and the steps included in a medical surveillance program. Each healthcare organization should determine who would be included in the surveillance based upon their interaction with hazardous drugs.