| Abbreviation | Definition |
|---|---|
| NPA | New Pheromone Additive |
| NPAA | Naturopathic Physicians Association of Australia |
| NPC | No Previous Complaint |
| NPD | Narcissistic Personality Disorder |
| NPDH | New Persistent Daily Headache |
| NPDL | Nodular Poorly Differentiated Lymphocytes |
| NPDR | Non-Proliferative Diabetic Retinopathy |
| NPH | Neutral Protamine Hagedorn |
| NPH | Neutral Protamine Hagerdorn |
| NPH | No previous history |
| NPH | Normal Pressure Hydrocephalus |
| NPH | Nothing By Mouth |
| NPL | No Perceived Light |
| NPN | Northwest Physicians Network |
| NPO | Northern Physicians Organization |
| NPOMN | Nothing by mouth after midnight |
| NPP | Neuroscience Physiology and Pharmacology |
| NPS | Neurotransmitter Production Support |
| NPT | Nasal Pungency Threshold |
| NPT | Normal pressure and temperature |