| Abbreviation | Interpretation | 
| M | male | 
| molar | |
| married | |
| mille | |
| minim | |
| mass | |
| medial | |
| meter | |
| mild | |
| murmur | |
| MA | mean arterial | 
| maternal age | |
| medical assistance | |
| medical authorization | |
| menstrual age | |
| mental age | |
| MAB | monoclonal antibody | 
| Maximal androgen blockade | |
| maternal antibody | |
| MAC | Monitored Anesthesia Care | 
| macula | |
| Maximum Allowable Cost | |
| medial arterial calcification | |
| minimum alveolar concentration | |
| mid-arm circumference | |
| MAD | major affective disorder | 
| Maximum Acceptable Dose | |
| median absolute deviation | |
| MAE | medical air evacuation | 
| moves all extremities | |
| median absolute error | |
| MAES | moves all extremities slowly | 
| medication administration errors | |
| MAF | macrophage activation factor | 
| Medical Assistance Facility | |
| mean aortic flow | |
| malignant ascites fluid | |
| metabolic activity factor | |
| MAG | myelin-associated glycoprotein | 
| Metal Active Gas | |
| magnesium | |
| MAHA | microangiopathic hemolytic anemia | 
| MAI | Movement Assessment of Infants | 
| Multilevel Assessment Instrument | |
| maximal aggregation index | |
| microscopic aggregation index | |
| Mycobacterium avium infection | |
| MAL | male | 
| malaise | |
| Motor Activity Log | |
| Malaria Unit | |
| malignancy | |
| MALIG | malignant | 
| MAM | Macrophage adhesion molecule | 
| median age at menarche | |
| mammogram | |
| mitochondria-associated membrane | |
| MAMMO | mammography | 
| mammogram | |
| MAMP | methamphetamine | 
| MAN | magnocellular nucleus of the anterior neostriatum | 
| mannitol | |
| malignancy associated neutropenia | |
| medial amygdaloid nucleus | |
| manipulate | |
| MAND | mandibular / mandible | 
| MAO | monoamine oxidase | 
| maximum acid output | |
| Medical Assistance Only | |
| MAP | mean arterial pressure | 
| mitogen-activated protein | |
| malignant atrophic papulosis | |
| mean airway pressure | |
| maximal aerobic power | |
| Mouse antibody production | |
| morning after pill | |
| muscle-action potential | |
| MAR | medication administration record | 
| macrocytic anemia, refractory | |
| minimum angle of resolution | |
| mixed antiglobulin reaction | |
| MAS | macrophage activation syndrome | 
| minimum-acess surgery | |
| mobile arm support | |
| MAT | multifocal atrial tachycardia | 
| mean absorption time | |
| multiple agent therapy | |
| mean arousal time | |
| maternal | |
| manual arts therapist | |
| MAU | microalbuminuria | 
| Medical Assessment Unit | |
| MAX | maxilla | 
| maximal , maximum | |
| maximal exercise | |
| MB | mammillary body | 
| mouse brain | |
| methylene blue | |
| Mallory bodies | |
| midbrain | |
| mandible | |
| maternal blood | |
| myocardial bands | |
| MBC | male breast cancer | 
| metastatic breast cancer | |
| maximal breathing capacity | |
| maximum binding capacity | |
| maximum bladder capacity | |
| Minimal bactericidal concentration | |
| MBD | metabolic bone disease | 
| maximum bactericidal dilution | |
| mineral bone density | |
| Marchiafava-Bignami disease | |
| metastatic bone disease | |
| minimal brain damage | |
| MBE | may be elevated | 
| medium below elbow | |
| MBF | muscle blood flow | 
| medullary blood flow | |
| myocardial blood flow | |
| microvascular blood flow | |
| mesenteric blood flow | |
| MBHI | Millon Behavioral Health Inventory | 
| MBI | mild brain injury | 
| Maslach Burnout Inventory | |
| Modified Barthel Index | |
| mucosal barrier injury | |
| MBL | Marginal bone loss | 
| medulloblastoma | |
| mediastinal B-cell lymphom | |
| mannose-binding lectin | |
| menstrual blood loss | |
| MBM | meat and bone meal | 
| mineral basal medium | |
| mother's breast milk | |
| MBO | malignant bowel obstruction | 
| MBP | myelin basic protein | 
| mean blood pressure | |
| major basic protein | |
| malignant brachial plexopathy | |
| mean arterial blood pressure | |
| MBQ | megabecquerel(s) | 
| MBR | major breakpoint region | 
| Medical Birth Registry | |
| membrane bioreactors | |
| MBS | modified barium swallow | 
| Medicare Benefits Schedule | |
| Mallory bodies | |
| marginal bands | |
| medulloblastomas | |
| MBT | maternal blood type | 
| mean body temperature | |
| Mycobacteria tuberculosis | |
| mixed bacterial toxin | |
| MC | mast cell | 
| Menstrual cycle | |
| motor control | |
| male child | |
| medium-chain | |
| metacarpal | |
| minimal change | |
| microcalcifications | |
| mitomycin C | |
| myocarditis | |
| mononuclear cell | |
| MCA | middle cerebral artery | 
| mean cell area | |
| major coronary artery | |
| Medicines Control Agency | |
| metacarpal amputation | |
| middle cerebral aneurysm | |
| medical care administration | |
| MCAS | major congenital anomalies | 
| middle cerebral arteries | |
| monoclonal antibodies | |
| MCB | multicolor banding | 
| macro chromatin body | |
| midcycle bleeding | |
| microcirculatory bed | |
| monoconjugated bilirubin | |
| MCC | mandibular condylar cartilage | 
| metastatic colorectal cancer | |
| maximum cystometric capacity | |
| Merkel cell carcinomas | |
| meningococcal C conjugate | |
| midstream clean-catch | |
| metastatic cord compression | |
| MCCU | mobile coronary care unit | 
| MCD | mean central dose | 
| mast cell degranulating | |
| mean cell diameter | |
| mean corpuscular diameter | |
| minimal change disease | |
| medullary cystic disease | |
| MCE | major coronary event | 
| Medical Care Evaluation | |
| Myocardial contrast echography | |
| Maximum Credible Event | |
| myocardial contrast echocardiography | |
| MCF | macrophage chemotactic factor | 
| Malignant Catarrhal Fever | |
| multicentric foci | |
| middle cranial fossa | |
| MCFA | medium-chain fatty acid(s) | 
| MCG | microgram | 
| medium chain glyceride | |
| mast cell granules | |
| Magnetocardiographic | |
| minimal change glomerulopathy | |
| MCH | mean corpuscular hemoglobin | 
| Major histocompatibility complex | |
| metacholine | |
| MCHC | mean corpuscular hemoglobin concentration | 
| MCI | mild cognitive impairment | 
| mean cardiac index | |
| metacarpal cortical index | |
| MCL | mantle cell lymphoma | 
| medial collateral ligament | |
| midclavicular line | |
| most comfortable level | |
| maximum comfort level | |
| mast cell leukemia | |
| midcostal line | |
| MCN | mast cell number | 
| Maternal Child Nursing | |
| minimal change nephrosis | |
| main cuneate nucleus | |
| minimal change nephropathy | |
| MCO | managed care organization | 
| MCP | mean carotid pressure | 
| Managed Care Provider | |
| maximum closure pressure | |
| mean circulatory pressure | |
| MCR | metabolic clearance rate | 
| Medical Cost Ratio | |
| metabolic clearance | |
| methicillin-resistant | |
| MCRC | metastatic colorectal cancer | 
| MCS | mental component summary | 
| Managed Care System | |
| magnetic coil stimulation | |
| minimally conscious state | |
| mast cell sarcoma | |
| mast cells | |
| motor cortex stimulation | |
| MCSA | maximum cross-sectional area | 
| medial cross-sectional area | |
| minimal cross-sectional area | |
| MCT | Mean circulation time | 
| medium chain triglycerides | |
| mast cell tumors | |
| Mean cortical thickness | |
| medullary carcinoma of thyroid | |
| MCU | maximum care unit | 
| malaria control unit | |
| micturating cystourethrogram | |
| motor cortex unit | |
| MCV | mean corpuscular volume | 
| MD | Medical Doctor | 
| magnesium deficiency | |
| macula degeneration | |
| muscular dystrophy | |
| maintenance dialysis | |
| maintenance dose | |
| moderate disability | |
| major depression | |
| manic depression | |
| Meniere disease | |
| multiple dose | |
| mixed diet | |
| myocardial damage | |
| maternal deprivation | |
| MDA | minimum detectable amount | 
| Maliondialdehyde | |
| manual dilation of the anus | |
| mass drug administrations | |
| MDC | Major Diagnostic Categories | 
| macrophage-derived chemokine | |
| Metoprolol in Dilated Cardiomyopathy | |
| MDCM | mildly dilated congestive cardiomyopathy | 
| MDD | major depressive disorder | 
| manic-depressive disorder | |
| mean daily dose | |
| multiple daily dosing | |
| MDE | major depressive episode | 
| MDF | myocardial depressant factor | 
| median frequency | |
| macrophage deactivation factor | |
| MDI | Metered Dose Inhaler | 
| multiple daily insulin | |
| Multiscore Depression Inventory | |
| manic-depressive illness | |
| mental developmental index | |
| multiple daily injection | |
| MDL | midazolam | 
| Minimum Detection Limit | |
| median duration of lactation | |
| MDM | monocyte-derived macrophage | 
| Medical Decision Making | |
| mid-diastolic murmur | |
| MDO | mentally disordered offender | 
| minimum detectable object | |
| MDP | manic-depressive psychosis | 
| maximum diastolic potential | |
| methylene diphosphonate | |
| maximum digital pulse | |
| MDPI | maximum daily permissible intake | 
| Molecular Diversity Preservation International | |
| MDR | Medical Device Reporting | 
| medium dose rate | |
| minimum daily requirement | |
| multi drug resistance | |
| Microbial Drug Resistance | |
| MDS | Myelodysplastic Syndrome | 
| Minimal Data Set | |
| maternal deprivation syndrome | |
| medical data source | |
| MDT | mean dissolution time | 
| mean death time | |
| multiple drug therapy | |
| maggot debridement therapy | |
| motion detection threshold | |
| multidisciplinary team | |
| MDU | maintenance dialysis unit | 
| Multiple Disability Unit | |
| MDV | Myocardial Doppler velocity | 
| maximum desire to void | |
| Marek disease virus | |
| multiple dose vial | |
| MDY | month, date, year | 
| ME | macular edema | 
| middle ear | |
| major errors | |
| manic episode | |
| medical events | |
| medical evidence | |
| medical examiner | |
| mouse embryo | |
| MEA | Malt Extract agar | 
| mean electrical axis | |
| Middle ear adenoma | |
| multiple endocrine adenomatosis | |
| MEB | methylene blue | 
| malt extract broth | |
| Medical Evaluation Board | |
| MEC | meconium | 
| mammary epithelial cell | |
| mecamylamine | |
| medical eligibility criteria | |
| median effective concentration | |
| middle ear canal | |
| medical emergency clinic | |
| MECS | measured environmental concentrations | 
| mammary epithelial cells | |
| medullary epithelial cells | |
| MED | male erectile dysfunction | 
| minimum effective dose | |
| Median effective dose | |
| minimal erythema dose | |
| Masters of Education | |
| Medicine | |
| main excretory duct | |
| MEDS | medications | 
| minimal effective doses | |
| MEE | middle ear effusion | 
| measured energy expenditure | |
| maintenance energy expenditure | |
| MEF | maximum expired flow rate | 
| middle ear fluid | |
| migration enhancement factor | |
| MEG | magnetoencephalography | 
| megaloblast | |
| Megestrol | |
| megakaryocyte | |
| MEI | Medicare Economic Index | 
| maximally exposed individual | |
| magnetic endoscope imaging | |
| middle ear implant | |
| MEL | maximum exposure limit | 
| melasma | |
| melanoma | |
| MEM | memory | 
| medium | |
| membrane | |
| macrophage electrophoretic mobility | |
| minimal essential medium | |
| MEN | menstruation | 
| meningeal | |
| meniscus | |
| Multiple Endocrine Neoplasia | |
| medically-enhanced normality | |
| meninges | |
| meningitis | |
| MEO | malignant external otitis | 
| MEP | maximal expiratory pressure | 
| molecular electrostatic potential | |
| motor evoked potential | |
| mEq | milliequivalent | 
| MER | mean ejection rate | 
| maintenance energy requirement | |
| medical evidence of record | |
| Medication Error Report | |
| M/E ratio | myeloid/erythroid ratio | 
| MES | maximal electroshock seizures | 
| maintenance electrolyte solution | |
| maximal electric shock | |
| MESS | Mangled Extremity Severe Score | 
| MET | medical emergency team | 
| metastasis | |
| maximal exercise test | |
| Mean Epithelial Thickness | |
| medical emergency treatment | |
| metabolic | |
| metabolic acidosis | |
| METH | methamphetamine | 
| methadone | |
| MetHb | methemoglobin | 
| methemoglobinemia | |
| METS | metabolic syndrome | 
| metabolic equivalents | |
| metastases | |
| METT | maximum exercise tolerance test | 
| MEV | measles virus | 
| megaelectron volts | |
| maximum exercise ventilation | |
| minimal excursionary ventilation | |
| MEWDS | multifocal evanescent white dot syndrome | 
| MF | magnification factor | 
| maintenance flow | |
| magnetic field | |
| maximal force | |
| median frequency | |
| Malassezia furfur | |
| mitogenic factor | |
| middle finger | |
| mycosis fungoides | |
| myocardial fibrosis | |
| M/F | male-female | 
| M & F | male and female | 
| MFA | malaise, fatigue, and anorexia | 
| mean field approximation | |
| marker frequency analysis | |
| MFAT | multifocal atrial tachycardia | 
| MFB | medial forebrain bundle | 
| myofibroblasts | |
| metallic foreign body | |
| MFC | medial femoral condyle | 
| medial frontal cortex | |
| multifactor complex | |
| minimal fungicidal concentration | |
| MFD | minimum fatal dose | 
| multiple fractions per day | |
| matched family donor | |
| milk-free diet | |
| mid forceps delivery | |
| MFEM | maximal forced expiratory maneuver | 
| MFERG | multifocal electroretinogram | 
| MFH | malignant fibrous histiocytoma | 
| MFI | mean fluorescent intensity | 
| male factor infertility | |
| metastasis-free interval | |
| MFM | maternal fetal medicine | 
| multifidus muscle | |
| myofibrillar myopathy | |
| MFNS | mometasone furoate nasal spray | 
| MFR | mid-forceps rotation | 
| mean flow rate | |
| Medical First Responder | |
| maximum flow rate | |
| mean filling rate | |
| MFS | Medicare Fee Schedule | 
| Marfan syndrome | |
| motive for smoking scale | |
| maternal-fetal surgery | |
| mitral first sound | |
| MFT | muscle function test | 
| Marriage and Family Therapist | |
| muscle fatigue test | |
| MFU | medical follow-up | 
| MG | magnesium | 
| mean gradient | |
| milligram | |
| myasthenia gravis | |
| mammary gland | |
| Monoglycerides | |
| mg | milligram | 
| MGCT | malignant glandular cell tumor | 
| male germ cell tumor | |
| MGD | Modulation gap detection | 
| mean glandular dose | |
| magnesium deficiency | |
| MGF | macrophage growth factor | 
| mast cell growth factor | |
| MGG | May-Grunwald-Giemsa | 
| Molecular and General Genetics | |
| MGIT | mycobacterial growth indicator tube | 
| MGM | milligram | 
| maternal grandmother | |
| MGN | membranous glomerulonephritis | 
| MGO | magnesium oxide | 
| MGP | marginal granulocyte pool | 
| medical group practice | |
| mucous glycoprotein | |
| MGR | murmurs, gallops, or rubs | 
| marrow granulocyte reserve | |
| MGS | magnetic guidance system | 
| malignant gliomas | |
| Meckel-Gruber syndrome | |
| monoglycerides | |
| MGUS | monoclonal gammopathy of undetermined significance | 
| MGW | multiple gunshot wound | 
| MGY | milligray | 
| MH | Mental Health | 
| medical history | |
| menstrual history | |
| macular hemorrhage | |
| malignant hypertension | |
| marital history | |
| malignant hyperthermia | |
| MHA | major histocompatibility antigen | 
| Master's of Health Administration | |
| Mental Health Assistant | |
| MHB | maximum hospital benefit | 
| methemoglobin | |
| MHC | major histocompatibility complex | 
| mental health center | |
| myosin heavy chain | |
| MHD | Mental Health Department | 
| minimum hemolytic dilution | |
| maintenance hemodialysis | |
| minimum hemorrhagic dose | |
| MHH | mental health hold | 
| MHI | Mental Health Index | 
| Minor Head Injury | |
| malignant histiocytosis of intestine | |
| MHL | maximum heart length | 
| mixed hearing loss | |
| MHIP | mental health inpatient | 
| Medicare Hospital Information Project | |
| MHN | massive hepatic necrosis | 
| Managed Health Network | |
| Mental Health Nurse | |
| MHO | medical house officer | 
| microsomal heme oxygenase | |
| MHP | moist heat packs | 
| Managed Healthcare Professional | |
| metabolic heat production | |
| MHS | major histocompatibility system | 
| Master of Health Science | |
| malignant hyperthermia susceptible | |
| Mental Health Services | |
| MHT | malignant hypertension | 
| mild head trauma | |
| mental health team | |
| menopausal hormone therapy | |
| MHV | mechanical heart valves | 
| middle hepatic vein | |
| MHW | mental health worker | 
| MHX | methohexital | 
| MI | myocardial infarction | 
| Medical Informatics | |
| membrane intact | |
| mental illness | |
| metabolic index | |
| myocardial ischemia | |
| mental institution | |
| MIA | medically indigent adult | 
| malnutrition, inflammation and atherosclerosis | |
| minimally-invasive anesthesia | |
| MIBE | measles inclusion body encephalitis | 
| MIC | minimal inhibitory concentration | 
| mean inhibitory concentration | |
| maternal and infant care | |
| medical intensive care | |
| MICA | mentally ill, chemical abuser | 
| microinvasive carcinoma | |
| MICRO | microcytic | 
| microcyte | |
| MID | multi-infarct dementia | 
| maximum inhibitory dilution | |
| minimum inhibitory dose | |
| minimal ineffective dose | |
| MIDD | maternally inherited diabetes and deafness | 
| MIE | maximim inspiratory effort | 
| Medical Improvement Expected | |
| MIG | measles immune globulin | 
| Medical Information Group | |
| MIH | medication-induced headache | 
| maturation-inducing hormone | |
| minor histocompatibility | |
| MII | multichannel intraluminal impedance | 
| metaphase II | |
| multiple insulin injections | |
| MIL | mean intercept length | 
| MIN | mineral | 
| minimal | |
| minim | |
| multiple intestinal neoplasia | |
| minute | |
| MIO | maximal incisal opening | 
| minimum identifiable odor | |
| MIP | macrophage inflammatory protein | 
| mean intrathoracic pressure | |
| major intrinsic protein | |
| maximal inspiratory pressure | |
| mean incubation period | |
| MIRD | medical internal radiation dose | 
| MIRP | myocardial infarction rehabilitation program | 
| minimally invasive radioguided parathyroidectomy | |
| MIRS | Medical Improvement Review Standard | 
| minimally invasive radio-guided surgery | |
| MIS | Minimally Invasive Surgery | 
| Motor Index Score | |
| management information systems | |
| melanoma in situ | |
| medical information service | |
| maturation-inducing steroid | |
| MISC | miscarriage | 
| MISS | minimally invasive spine surgery | 
| medical interview satisfaction scale | |
| MIT | Magnetic induction tomography | 
| mean input time | |
| metabolic inhibition test | |
| meconium in trachea | |
| male impotence test | |
| MIU | million international units | 
| milli-international unit | |
| MJ | megajoule | 
| myoclonic jerks | |
| MJS | medial joint space | 
| MJT | Mead Johnson tube | 
| MKAB | may keep at bedside | 
| MKB | megakaryoblasts | 
| married, keeping baby | |
| MKI | mitosis-karyorrhexis index | 
| MKM | Mehrkoordinaten Manipulator | 
| ML | malignant lymphoma | 
| milliliter | |
| mediolateral | |
| middle lobe | |
| maximum length | |
| myeloid leukemia | |
| medial lemniscus | |
| mechanical lithotripsy | |
| MLA | medical laboratory assay | 
| minimal lumen area | |
| MLAC | minimum local analgesic concentration | 
| MLB | microlaryngoscopy and bronchoscopy | 
| maximum-likelihood-binomial | |
| MLC | metastatic liver cancer | 
| mixed lymphocyte culture | |
| midline catheter | |
| minimum lethal concentration | |
| myosin light chain | |
| minimal lethal concentration | |
| multilevel care | |
| multilumen catheter | |
| MLD | manual lymph drainage | 
| minimal lethal dose | |
| malignant lymphoproliferative diseases | |
| Mean lung density | |
| minimal lumen diameter | |
| Myelin deficiency | |
| MLE | maximum likelihood estimation | 
| maleless | |
| Murine lung epithelial | |
| midline episiotomy | |
 
