| PNB | p-nitrobiphenyl; perineal needle biopsy; peripheral nerve block; premature nodal beat |
|---|---|
| PNC | penicillin; peripheral nucleated cell; pneumotaxic center; premature nodal contracture |
| POF | pattern of failure; position of function; premature ovarian failure; primary ovarian failure; pyruva... |
| POFX | X-linked premature ovarian failure |
| PPROM | preterm premature rupture of fetal membranes |