| PN | papillary necrosis; parenteral nutrition; penicillin; perceived noise; percussion note; periarteriti... |
|---|---|
| ANTR | apparent net transfer rate |
| NAE | net acid excretion |
| NAF | nafcillin; National Amputation Foundation; National Ataxia Foundation; net acid flux |
| NAI | net acid input; no accidental injury; no acute inflammation; nonadherence index |