Q
| qAM* | every morning |
| q.2h.* | every 2 hours |
| q.d.* | every day |
| qEEG | quantitative electroencephalography |
| q.h.* | every hour |
| q.i.d.* | four times a day |
| q.o.d.* | every other day |
| qPM* | every evening |
R
| RA | Right atrium; rheumatoid arthritis |
| RAI | Radioactive iodine |
| RAIU | Radioactive iodine uptake |
| RBC, Rbc | red blood cell |
| RD | Respiratory distress |
| RDS | Respiratory distress syndrome |
| RF | Rheumatoid factor; radio frequency |
| RGB | Roux-en-Y gastric bypass |
| RK | Radial keratotomy |
| RLQ | Right lower quadrant |
| R/O | Rule out |
| ROM | Range of motion |
| RP | Retrograde pyelogram; retrograde pyelography |
| RSO | Right salpingo-oophorectomy |
| rt | Right |
| RUQ | Right upper quadrant |
| RV | Residual volume; right ventricle |
