| NIIS | National Institute of Infant Services |
|---|---|
| NRSFPS | National Reporting System for Family Planning Services |
| NS | natural science; Neosporin; nephrosclerosis; nephrotic syndrome; nervous system; neurological surger... |
| NSS | normal saline solution; normal size and shape; not statistically significant; nutrition support serv... |
| OARS | older Americans resources and services |