NAFLD (non-alcoholic fatty liver disease)

NAI (non-accidental injury)

NAI (no action indicated)

NAIT (neonatal alloimmune thrombocytopenia)

NaOH (sodium hydroxide)

NASH (non-alcoholic steatohepatitis)

NAT (non-accidental trauma)

NAT (nucleic acid-based tests)

NB (newborn)

NBHS (newborn hearing screen)