| NOF | National Osteopathic Foundation; National Osteoporosis Foundation |
|---|---|
| NPA-NIHHDP | National Pituitary Agency-National Institutes of Health Hormone Distribution Program |
| NRC | National Research Council; National Response Center; normal retinal correspondence; not routine care... |
| NRCC | National Registry in Clinical Chemistry; National Research Council of Canada |
| NTA | 1) Naso-Tracheal Aspiration 2) National Tuberculosis Association |