| LU | left upper [limb]; loudness unit; Lupron; lytic unit |
|---|---|
| LyNeF | lytic nephritic factor |
| LR | labeled release; laboratory references; laboratory report; labor room; lactated Ringer [solution]; l... |
| AAR | active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction |
| APR | abdominoperineal resection; absolute proximal reabsorption; acute phase reaction or reactant; amebic... |