| RAM | random-access memory; rapid alternating movements; rectus abdominis muscle; rectus abdominis myocuta... |
|---|---|
| RARE | rapid acquisition with relaxation enhancement |
| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
| RDRS | rapid disability rating scale |
| REALM | rapid estimate of adult literacy in medicine |