MR
mental retardation
MRA
magnetic resonance angiography
MRI
magnetic resonance imaging
MRSA
methicillin-resistant staphylococcus aureus
MS
multiple sclerosis
MSE
mental status examination
MTP
metatarsalphalangeal joint
MVA or MVC
motor vehicle accident/collision
MVP
mitral valve prolapse
NA
not applicable
Na+
sodium
NaCl
sodium chloride
NAD
no acute distress
NG tube
nasogastric tube
NH
nursing home