List of medical abbreviations: M
| Abbreviation | Meaning | 
|---|---|
| M | murmur (heart murmur or heart attack that can cause death) | 
| MACE | Major Adverse Cardiovascular Events | 
| MAC | Mycobacterium avium complex | 
| MAE | moves all extremities | 
| MAHA | microangiopathic hemolytic anemia | 
| MAL | midaxillary line | 
| MALT | mucosa-associated lymphoid tissue | 
| MANOS | minilaparoscopy assisted natural orifice surgery | 
| MAOI | monoamine oxidase inhibitor | 
| Mφ | macrophage | 
| MAP | mean arterial pressure | 
| MAR | Medication Administration Record | 
| 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 | 
| MCA | mucinous cystadenoma | 
| MCAT | Medical College Admission Test | 
| MCC | MotorCycle Collision, Motor Cycle Crash | 
| MCD | minimal change diseaseharmful can cause cancer | 
| 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 | 
| MDip | Master Diploma (specialization) | 
| MDS | myelodysplastic syndrome | 
| ME | UK: Myalgic Encephalopathy ( = Chronic Fatigue Syndrome or “CFS”) | 
| M/E | microscopic examination | 
| MEC | Moderate emetic chemotherapy | 
| MEDLINE | Medical Literature Analysis and Retrieval System Online (U.S. National Library of Medicine) | 
| MELD | Model for End-Stage Liver Disease | 
| 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 | 
| MGPE | milligrams of phenytoin equivalents | 
| 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 | 
| MHMR | mental health and mental retardation | 
| 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 | 
| MIP | Maximum intensity projection, a technique used to enhance CT, MRI, MRA, and PET images | 
| MIS | Minimally Invasive Surgery Mullerian Inhibiting Substance | 
| MLC | mixed lymphocyte culture | 
| MLE | midline episiotomy | 
| MM | myeloid metaplasia middle meningeal multiple myeloma | 
| M&M | morbidity and mortality | 
| MMFR | midmaximal flow rate | 
| MMI | maximum medical improvement | 
| MMK | Marshall–Marchetti–Kranz procedure | 
| MMM | moist mucus membranes Myelofibrosis with Myeloid Metaplasia | 
| MMP | medical marijuana patient Medical Monitoring Project (of the US CDC) | 
| MMPI | Minnesota Multiphasic Personality Inventory | 
| MMR | measles, mumps, and rubella combined vaccination mismatch repair | 
| MMR-D | mismatch repair deficiency syndrome | 
| MMSE | mini-mental state examination | 
| MMT | malignant mesenchymal tumor Mixed Mullerian Tumor | 
| MN | membranous nephropathy | 
| MND | motor neurone disease, also known as amyotrophic lateral sclerosis (ALS), Lou Gehrig's disease or Charcot disease | 
| 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 | 
| MPT | multi-professional team | 
| MPV | mean platelet volume | 
| MR | medical representative mental retardation mitral regurgitation modified release (compare time release technology (medicine)) menstrual regulation (unsafe abortion) | 
| 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 UK: Musculoskeletal | 
| 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.) | 
| MSOF | multisystem organ failure | 
| MSSA | methicillin-sensitive Staphylococcus aureus (contrast with MRSA) | 
| 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 | 
| MTX | methotrexate | 
| MUGA | Multiple gated acquisition scan | 
| 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 | 
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