Depending on context, AD may mean admitting diagnosis, advanced directive, after discharge, Alzheimer's disease, or right ear.
Advance Directive
Alzheimer's disease
OD is the medical abbreviation meaning right eye.OD
no medical term with fldr abbreviation
Anno Domini
The medical abbreviation NFP means natural family planning.
Med is the most common medical abbreviation for the word "medical."MED
Inj. abbreviation means: injection
Abbreviation for right sacroposterior position
HTN is the medical abbreviation meaning hypertension, or high blood pressure.
medical ex
Standing Medical Orders
In medical terms, the abbreviation "resp" stands for respirations or respiratory, depending on the context.
"ad" isn't an abbreviation here. It is Latin and means as much as "to" or "until". So "ad infinitum" means something like "until infinity" or "neverending".