| NDR | neonatal death rate; normal detrusor reflex |
|---|---|
| OCR | oculocardiac reflex; oculocerebrorenal [syndrome]; optical character recognition |
| OORR | orbicularis oculi reflex response |
| PLR | pupillary light reflex |
| PTR | patellar tendon reflex; patient termination record; patient to return; peripheral total resistance; ... |