| IAEA | International Atomic Energy Agency |
|---|---|
| IARC | International Agency for Research on Cancer |
| MPA | mean pulmonary arterial [pressure]; medial preoptic area; Medical Procurement Agency; medroxyprogest... |
| NAACLS | National Accrediting Agency for Clinical Laboratory Sciences |
| NCA | National Certification Agency; National Council on Aging; National Council on Alcoholism; neurocircu... |