| JHR | Jarisch-Herxheimer reaction |
|---|---|
| JR | Jolly reaction; junctional rhythm |
| kf | flocculation rate in antigen-antibody reaction |
| LAR | laryngology; late asthmatic response; late reaction; left arm recumbent; leukocyte antigen-related |
| LCAR | late cutaneous anaphylactic reaction |