| MC | mass casualties; mast cell; Master of Surgery [Lat. Magister Chirurgiae]; maximum concentration; Med... |
|---|---|
| MCL | maximum containment laboratory; medial collateral ligament; midclavicular line; midcostal line; mini... |
| MCU | malaria control unit; maximum care unit; micturating cystourethrography; motor cortex unit |
| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
| MDHR | maximum determined heart rate |