| 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 |
| LDAR | latex direct agglutination reaction |
| RT-PCR | Reverse transcribed polymerase chain reaction |
|---|---|
| RT-PCR | Reverse transcript polymerase chain reaction |
| RT-PCR | Reverse transcriptase-polymerase chain reaction amplification |
| RT-PCR | Reverse transcription and polymerase chain reaction |
| RT-PCR | Reverse transcription and the polymerase chain reaction |