| NCA | National Certification Agency; National Council on Aging; National Council on Alcoholism; neurocircu... |
|---|---|
| NIA | National Institute on Aging; nephelometric inhibition assay; niacin; no information available; Nutri... |
| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
| PAR | participating provider; passive avoidance reaction; perennial allergic rhinitis; photosynthetically ... |
| PCA | para-chloramphetamine; parietal cell antibody; passive cutaneous anaphylaxis; patient care assistant... |