| PRI | Pain Rating Index |
|---|---|
| PRI | Placental Ribonuclease Inhibitor |
| PRI | proliferative rate index |
| PRID | Progesterone Releasing Intravaginal Device |
| primary SS | Primary Sjogren's syndrome |
| PRIME-MD | Primary Care Evaluation of Mental Disorders |
| PRINS | PRimed IN Situ |
| PRINS | PRimed IN Situ labeling |
| PRISM | Paediatric Risk of Mortality |
| PRIST | Paper Radio Immuno Sorbent Test |