I'd tell them to get back to me when the OSHA "Temp Standard" is ruled legal by the Federal court system. For now it's been stayed because it appears that OSHA is operating outside their authority. Until OSHA is deemed to have the proper authority to mandate the collection of private medical health information, which is currently illegal under HIPAA law, you will not be complying with this mandate. Document and save all correspondence in the event of a future lawsuit.