| QR | Quinone reductase |
|---|---|
| QRA | Quantitative Risk Assessment |
| QRDR | quinolone resistance determining region |
| QRS D | QRS duration |
| QRT-PCR | Quantitative reverse transcriptase-polymerase chain reaction |
| QRT-PCR | Quantitative reverse transcription polymerase chain reaction |
| QS | Quiet Sleep |
| QSAR | Quantitative Structure Activity Relationship |
| QSPR | Quantitative Structure-Property Relationship |
| QSRR | Quantitative structure retention relationships |