Various abbreviations may give different meanings especially in the context of medical terminology.

There is an endless possibility of meanings especially it varies from doctor to doctor or from place to place.

See for instance that it is a matter of language difference as with the British English and American English.

There are a number of published materials regarding medical abbreviations. Some hospitals used their own as per doctor’s requirement.

I’ve seen recently the Australian Dictionary of Clinical Abbreviations but I am more familiar with still the Stedman’s Abbreviations.