| NIR | near infrared |
|---|---|
| nIR | non-insulin-resistance |
| NIRA | nitrite reductase |
| NIRD | nonimmune renal disease |
| NIRMP | National Intern and Resident Matching Program |
| NIRNS | National Institute for Research in Nuclear Science |
| NIRS | near-infrared spectroscopy; normal inactivated rabbit serum |