| MACNUT | Macadamia Nut, IgE (RPS Only) |
| MACKRL | Mackerel IgE (RPS Only) |
| MCRAD | Macroamylase Determination (ARUP via RPS) |
| MPRL | Macroprolactin (RPS) |
| MG | Magnesium |
| MGF | Magnesium, Fecal |
| MRBC | Magnesium, RBC (ARUP via RPS) |
| UMGB | Magnesium, Urine, 24 Hour (RPS) |
| UMGS | Magnesium, Urine, Random (RPS) |
| PSPCR | Malaria (Plasmodium Species) by PCR (RPS) |
| MAL | Malaria Prep |
| TSTP | Male Testosterone Panel (PSPC) |
| MHPS | Malignant Hyperthermia Panel, Sequencing (ARUP via RPS) |
| MNB | Manganese, Blood (MAYO via RPS) |
| MAN | Manganese, Serum (RPS) |
| WBM | Manganese, Whole Blood (RPS) |
| MANGO | Mango IgE (RPS Only) |
| MBLS | Mannose Binding Lectin (RPS) |
| MBP | Mannose Binding Protein |
| FBN1 | Marfan Syndrome, FBN1 Sequencing (ARUP via RPS) |
| MSSI1 | Maternal Serum Screening, Integr Spec #1 PAPP-A, NT (ARUP via RPS) |
| MSSI2 | Maternal Serum Screening, Integrated Spec #2 (ARUP via RPS) |
| MMP9A | Matrix Metalloproteinase-9 (MMP-9) (ARUP via RPS) |
| ROM | Measles (Rubeola) Antibodies, IgM, Serum (MAYO via RPS) |
| RUOL | Measles (Rubeola) Antibody, IgG (RPS) |
| MEAM | Measles (Rubeola) Antibody, IgM (ARUP via RPS) |
| MVNAAT | Measles Virus by Qualitative NAAT (ARUP via RPS) |
| MEASLE | Measles Virus PCR (Swab or Urine) (RPS) |
| MMRRPS | Measles/Mumps/Rubella Immunity, Qualitative (RPS) |
| MMRVI | Measles/Mumps/Rubella/Varicella Zoster Immunity Qualitative (RPS) |
| MMRVPAN | Measles/Mumps/Rubella/VZV Quant Antibody Assessment Panel, IgG (ARUP via RPS) |
| MDS11 | Meconium Drug Screen Panel 11 (MEDTOX via RPS) |
| MDSPR | Meconium Drug Screen Panel 12 w/Alcohol (RPS) |
| UMEL | Melanin, Random Urine (RPS) |
| MSHA | Melanocyte Stimulation Hormone, Alpha (a-MSH) (RPS) |
| MLTNP | Melatonin, Serum or Plasma (ARUP via RPS) |
| MEEP | Meningitis/Encephalitis Panel (RPS) |
| FMEP | Meperidine (Demerol) and Normeperidine, Serum (Mayo via RPS) |
| CDMEPE | Meperidine & Metabolite, UR (Confirmation Only) (RPS) |
| MPDN | Meperidine and Metabolite, Serum (RPS) |
| MEPURQ | Meperidine, Urine w/reflex to Quant (ARUP via RPS) |
| MESA | Mephenytoin (RPS) |
| MEPR | Meprobamate (RPS) |
| HG | Mercury, Blood (RPS) |
| URHG | Mercury, Random or 24 Hour Urine (RPS) |
| MFPF | Metanephrine, Fractionated, Plasma Free (RPS) |
| METN | Metanephrines Urine Total/Fractionated Random or 24 Hr (RPS) |
| MTFRM | Metformin (RPS) |
| METHM | Methadone & Metabolite, Urine Quant (ARUP via RPS) |
| MCUN | Methadone Screen & Confirmation, Urine (RPS) |
| METHS | Methadone, Serum/Plasma (RPS) |
| METHME | Methamphetamine and Metabolite, Blood |
| MEOH | Methanol, Blood (ARUP via RPS) |
| MHGV | Methemoglobin (RPS) |
| METX | Methotrexate (RPS) |
| NMES | Methsuximide (Celontin) (RPS) |
| MMASR | Methylmalonic Acid (MMA) Serum Quantitative (RPS) |
| MMMAL | Methylmalonic Acid (MMA) Urine Quantitative (ARUP via RPS) |
| MCRR | Microalb/Creat Ratio, Urine |
| MCRT | Microalbumin/Creatinine Ratio, Timed Urine |
| MSI | Microsatellite Instability Analysis Study (RPS) |
| MICSPOR | Microsporidia by PCR (ARUP via RPS) |
| MILK | Milk IgE (RPS Only) |
| AMIT | Mitochondrial (M2) Antibody, IgG (RPS) |
| MTDNA | Mitochondrial Disorders Panel (mtDNA & Nuclear Genes)(ARUP via RPS) |
| MITOSP | Mitotane, Serum or Plasma (ARUP via RPS) |
| MLH1M | MLH1 Promoter Methylation Analysis (RPS) |
| MOLYBD | Molybdenum Quant, Serum or Plasma (RPS Only) |
| QMPSS | Monoclonal Gammopathy (MAYO via RPS) |
| MPSU | Monoclonal Protein Study, 24 Hr Urine (RPS) |
| MONX | Mononucleosis |
| MFUFR | Morphine Free (Unconjugated), Fluid (RPS) |
| MORP | Morphine Level (RPS) |
| MORPU | Morphine Level, Urine (Medtox via RPS) |
| FMNPP | Motor Neuropathy Panel (ARUP via RPS) |
| MSNER | Motor Sensory Eval (RPS ONLY) |
| MDS2 | Movement Disorder, Autoimmune Eval, Serum (MAYO via RPS) |
| MPLMUT | MPL Mutation Detection |
| MRSANS | MRSA by PCR, Nasal (ARUP via RPS) |
| MRSCU | MRSA Culture (RPS) |
| TBAPR | MTB Amplified Direct |
| MTHF | MTHFR DNA Analysis |
| MPSSR | Mucopolysaccharides Screen, Random Urine (RPS) |
| MUGWRT | Mugwort IgE (RPS Only) |
| MEN1 | Multiple Endocrine Neoplasia Type 1 (MEN1) Sequencing (RPS) |
| MSPL | Multiple Sclerosis Panel (RPS) |
| MUMPG | Mumps Ab IgG (RPS) |
| MUMPQT | Mumps IgG, Quantitative (RPS Only) |
| MUMPM | Mumps IgM Abs (RPS) |
| MUMPCR | Mumps Virus by PCR (ARUP via RPS) |
| MUSHRM | Mushroom IgE (RPS ONLY) |
| MUSK | MuSK Antibody (MAYO via RPS) |
| MUSTRD | Mustard IgE (RPS ONLY) |
| FMGRP | Myasthenia Gravis Reflex Panel (ARUP via RPS) |
| MYPH | Mycophenolic Acid (Cellcept) (RPS) |
| MYCOPC | Mycoplasma & Ureaplasma Species (Urogenital) by PCR (ARUP via RPS) |
| AMGEN | Mycoplasma genitalium, Transcription-Mediated Amplification, Urine or Urogenital Swab (Mayo via RPS) |
| MYAGM | Mycoplasma pneumoniae Antibodies, IgG & IgM (RPS) |
| MYABG | Mycoplasma pneumoniae Antibody, IgG (RPS) |
| MYPM | Mycoplasma pneumoniae Antibody, IgM (RPS) |
| MYCPNA | Mycoplasma Pneumoniae by PCR (RPS) |
| MYD88 | MYD88 Mutation Detection, Peripheral blood (RPS) |
| FMGA | Myelin Assoc. Glycoprotein (MAG) Antibody w/reflex (MAYO via RPS) |
| MAGAB | Myelin Associated Glycoprotein (MAG), Ab (RPS) |
| MYBP | Myelin Basic Protein (RPS) |
| MOGAG | Myelin Oligodendrocyte Glycoprotein (MOG) Ab, IgG w/reflex (ARUP via RPS) |
| MOGFS | Myelin Oligodendrocyte Glycoprotein IgG (FACS) Assay, Serum ( MAYO via RPS) |
| MYMPB | Myeloid Mutation Panel, Blood (RPS) |
| MYELOB | Myeloma Screening Panel (RPS) |
| MAS1 | Myelopathy, Autoimmune/Paraneoplastic Eval, Serum (MAYO via RPS) |
| MPNPB | Myelopathy, Autoimmune/Paraneoplastic Eval, Serum (MAYO via RPS) |
| MPO | Myeloperoxidase (MPO) Antibody (RPS) |
| MYOAST | Myocardial Antibody Screen w/reflex to Titer (Quest via RPS) |
| MYOGS | Myoglobin (RPS) |
| UMYG | Myoglobin, Urine (RPS) |
| FMYO3 | MyoMarker 3 Profile (MAYO via RPS) |
