| LAFR | laminar air flow room |
|---|---|
| LR | labeled release; laboratory references; laboratory report; labor room; lactated Ringer [solution]; l... |
| MAR | main admissions room; marasmus; marrow; maximal aggregation ratio; medication administration record;... |
| MER | mean ejection rate; medical emergency room; methanol extraction residue; murmur/energy ratio |
| OOR | out-of-room |