| MCHgb | mean corpuscular hemoglobin |
|---|---|
| MCI | mean cardiac index; methicillin; mucociliary insufficiency; muscle contraction interference |
| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
| MDD | major depressive disorder; mean daily dose |
| MDEBP | mean daily erect blood pressure |