| LPR | lactate-pyruvate ratio |
|---|---|
| L/R | left-to-right [ratio] |
| MAR | main admissions room; marasmus; marrow; maximal aggregation ratio; medication administration record;... |
| MCR | Medical Corps Reserve; melanocortin receptor; message competition ratio; metabolic clearance rate; m... |
| MDTR | mean diameter-thickness ratio |