| MHG | metropolitan health group |
|---|---|
| MNSs | a blood group system consisting of groups M, N, and MN |
| MRD | maximum rate of depolarization; measles-rindenpest-distemper [virus group]; medical records departme... |
| NCCTG | North Central Cancer Treatment Group |
| NCIC | CTG National Cancer Institute of Canada Clinical Trial Group |