Privacy & Security. Model Notices of Privacy Practices. The Office of the National Coordinator for Health Information Technology (ONC) and the Office for Civil Rights (OCR) collaborated to develop model Notices of Privacy Practices for health care providers and health plans for use when communicating with their patients and plan members.
Q.O.D. = every other day. Q.A.D. = every alternate day. Technically speaking, I would be hard pressed to find a difference. Nevertheless, I have spent a lifetime writing q.o.d. on prescriptions so that pharmacists can transcribe the latin abbreviation back into plain English for the patient. What a useless step!
The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon and midnight: neither moment can logically be identified as before noon (am) or after noon (pm). For example, the moment of midnight occurs precisely 12 hours after noon on the previous day and 12 hours before noon on the following day.