| LR | Light Perception |
|---|---|
| LR | labeled release; laboratory references; laboratory report; labor room; lactated Ringer [solution]; large reticulocyte; latency reaction; latency relaxation; lateral rectus [muscle]; lateral retinaculum; left rotation; light reaction; light reflex; limb reduction [defect]; limit of reaction; logistic regression; low renin; lymphocyte recruitment |
| Lr | lawrencium; Limes reacting dose of diphtheria toxin |
| LRA | low right atrium |
| LRC | learning resource center; lower rib cage |
| LRCP | Licentiate of the Royal College of Physicians |
| LRCS | Licentiate of the Royal College of Surgeons |
| LRCSE | Licentiate of the Royal College of Surgeons, Edinburgh |
| LRD | living related donor |
| LRDT | living related donor transplant |