N/V (nausea/vomiting)

N/V/D (nausea, vomiting, diarrhea)

N&V (nausea and vomiting)

Na (sodium [element])

NA (Nursing Assistant)

NA (not applicable)

NAA (N-acetylaspartic acid)

NAA (nucleic acid amplification)

NABS (normal active bowel sounds)

NaCl (Sodium Chloride)