List of medical abbreviations: M

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Abbreviation Meaning
M murmur (heart murmur)
MAC Mycobacterium avium complex
MAE moves all extremities
MAHA microangiopathic hemolytic anemia
MAL midaxillary line
MALT mucosa-associated lymphoid tissue
MAOI monoamine oxidase inhibitor
macrophage
MAP mean arterial pressure
MARSA methicillin- and aminoglycoside-resistant Staphylococcus aureus
MAS Morgagni–Adams–Stokes syndrome
meconium aspiration syndrome
MAST Michigan alcohol screening test
MAT multifocal atrial tachycardia
microscopic agglutination test
MBSS modified barium swallow study
MC metacarpal bone
MCD minimal change disease
MCP metacarpophalangeal joint
MCHC mean corpuscular hemoglobin concentration
MCH mean cell hemoglobin;
mean corpuscular hemoglobin
MC&S microscopy, culture, and sensitivity (the investigation steps in processing microbiology samples)
MCTD mixed connective tissue disease
MCV mean corpuscular volume
MDCT multidetector row computerized tomography
MDD major depressive disorder
MDE major depressive episode
MDI metered dose inhaler
MDS myelodysplastic syndrome
M/E microscopic examination
MEDLINE Medical Literature Analysis and Retrieval System Online (U.S. National Library of Medicine)
MEN multiple endocrine neoplasia
MeSH Medical subject headings (U.S. National Library of Medicine)
MET metabolic equivalent
met metastasis (pronounced like the word met; plural mets)
MFM maternal and fetal medicine
Mg magnesium
MG myasthenia gravis
MGN membranous glomerulonephritis
MgSO4 magnesium sulfate (Do not use this abbreviation. Write out the name. Per the do-not-use list.)
MGUS monoclonal gammopathy of undetermined significance (unknown or uncertain may be substituted for undetermined)
MHA-TP microhemagglutination assay for T. pallidum
MHW Mental Health Worker
MI myocardial infarction
MIC minimum inhibitory concentration
MICA mental illness and chemical abuse;
mentally ill chemical abuser
MICU mobile intensive care unit / medical intensive care unit
MIF Müllerian inhibitory factor
MIS Minimally Invasive Surgery
MLC mixed lymphocyte culture
MLE midline episiotomy
MM myeloid metaplasia; middle meningeal
M&M morbidity and mortality
MMFR midmaximal flow rate
MMI maximum medical improvement
MMK Marshall–Marchetti–Kranz procedure
MMPI Minnesota Multiphasic Personality Inventory
MMSE mini-mental state examination
MN membranous nephropathy
MOB mother of baby
mod moderate;
modified
MODY maturity onset diabetes of the young
Mo monocytes
MoM multiples of the median
MOM milk of magnesia
Mono-Di monochorionic-diamniotic twins
Mono-Mono monochorionic-monoamniotic twins
MOPP mechlorethamine, vincristine, procarbazine, and prednisone in combination (older treatment for Hodgkin's lymphoma)
MPA medroxyprogesterone acetate
MPD Main pancreatic duct
MPD(s) myeloproliferative disease(s)
MPGN membranoproliferative glomerulonephritis
MPO myeloperoxidase
MPV mean platelet volume
MR medical representative
mental retardation
mitral regurgitation
modified release (compare time release technology (medicine))
MRA magnetic resonance angiography
MRCP magnetic resonance cholangiopancreatography
MRG murmurs, rubs, and gallops (see heart sounds)
MRI magnetic resonance imaging
MRSA methicillin-resistant Staphylococcus aureus
MS medical student (MS-1, MS-2, MS-3, MS-4)
mental status (see mental status examination)
mitral stenosis
multiple sclerosis
MS-AFP maternal serum alpha-fetoprotein
MSDU medical surgical day unit
MSE mental status examination
MSH melanocyte-stimulating hormone
MSK medullary sponge kidney
MSM men who have sex with men
MSO4 morphine sulfate (Do not use this abbreviation. Write out the name. Per the do-not-use list.)
MSU midstream urine sample (used in testing for presence of urinary tract infections)
monosodium urate
MSUD maple syrup urine disease
MT metatarsal bone
MTBI mild traumatic brain injury
MTP metatarsalphalangeal joint
MTX methotrexate
MUSE Medicated Urethral System for Erections
MVA motor vehicle accident
MVC motor vehicle crash
MVI Multivitamin
MVo2 mixed venous oxygen concentration
MVP mitral valve prolapse
MVPS mitral valve prolapse syndrome
MVR mitral valve replacement