| Abbrev. |
Meaning |
| M |
murmur (heart murmur) |
| MAE |
moves all extremities |
| MAHA |
microangiopathic hemolytic anemia |
| MAL |
midaxillary line |
| MALT |
mucosa-associated lymphoid tissue |
| MAOI |
monoamine oxidase inhibitor |
| Mφ |
macrophage |
| MAP |
mean arterial pressure |
| MARSA |
methicillin- and aminoglycoside-resistant Staphylococcus aureus |
| MAS |
Morgagni-Adams-Stokes syndrome |
| 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) |
| MCV |
mean corpuscular volume |
| MDD |
major depressive disorder |
| MDE |
major depressive episode |
| 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) |
| Mg |
magnesium |
| 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) |
| MI |
myocardial infarction |
| MIC |
minimum inhibitory concentration |
| MICA |
mental illness and chemical abuse;
mentally ill chemical abuser |
| MICU |
mobile intensive care unit |
| MLC |
mixed lymphocyte culture |
| MLE |
midline episiotomy |
| MM |
myeloid metaplasia |
| M&M |
morbidity and mortality |
| MMPI |
Minnesota Multiphasic Personality Inventory |
| MMSE |
mini-mental state examination |
| MN |
membranous nephropathy |
| mod |
moderate;
modified |
| MODY |
maturity onset diabetes of the young |
| Mo |
monocytes |
| MOM |
milk of magnesia |
| MOPP |
mechlorethamine, vincristine, procarbazine, and prednisone in combination (older treatment for Hodgkin's lymphoma) |
| MPD(s) |
myeloproliferative disease(s) |
| MPGN |
membranoproliferative glomerulonephritis |
| 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 |
| MSE |
mental status examination |
| MSH |
melanocyte-stimulating hormone |
| MSK |
medullary sponge kidney |
| 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) |
| MSUD |
maple syrup urine disease |
| MT |
metatarsal bone |
| MTBI |
mild traumatic brain injury |
| MTP |
metatarsalphalangeal joint |
| MTX |
methotrexate |
| MVA |
motor vehicle accident |
| MVC |
motor vehicle crash |
| MVP |
mitral valve prolapse |
| MVPS |
mitral valve prolapse syndrome |
| MVR |
mitral valve replacement |
