| NBF | no breast feeding |
|---|---|
| NBI | neutrophil bactericidal index; no bone injury; non-battle injury |
| NBICU | newborn intensive care unit |
| NBL | neuroblastoma |
| NBM | no bowel movement; normal bone marrow; normal bowel movement; nothing by mouth |
| nbM | newborn mouse |
| nbMb | newborn mouse brain |
| NBME | National Board of Medical Examiners; normal bone marrow extract |
| NBN | newborn nursery |
| NBO | non-bed occupancy |