| 17283-3 | Mirtazapine | DRUG/TOX |
| 17284-1 | Mitochondria Ab (qualitative, immunofluorescence) | SERO |
| 17285-8 | Mitochondria Ab (immunofluorescence) | SERO |
| 17286-6 | Monocytes/Leukocytes (Synovial Fluid, manual count) | HEM/BC |
| 17287-4 | Monocytes/Leukocytes (Urine, manual count) | HEM/BC |
| 17288-2 | Ganglioside GM1 Ab (qualitative, immunofluorescence) | SERO |
| 17289-0 | Monosodium glutamate (MSG) IgE Ab | ALLERGY |
| 1729-3 | Adenosine triphosphatase (Red Blood Cells) | CHEM |
| 17290-8 | Morphine (qualitative, confirmatory method) | DRUG/TOX |
| 17291-6 | Mulberry tree IgE Ab | ALLERGY |
| 17292-4 | Mumps virus Ab (CSF) | MICRO |
| 17293-2 | Mumps virus IgG+IgM Ab | MICRO |
| 17294-0 | Mushroom toxins (Urine) | MICRO |
| 17296-5 | Mycobacterium tuberculosis complex rRNA in Specimen (qualitative, probe) | MICRO |
| 17297-3 | Mycobacterium tuberculosum rRNA in Unspecified specimen (qualitative, dna probe) | MICRO |
| 17298-1 | Mycobacterium tuberculosis rRNA in Unspecified specimen (qualitative, dna probe) | MICRO |
| 17299-9 | Mycoplasma fermentans Ab (qualitative) | MICRO |
| 173-5 | Chloramphenicol (minimum inhibitory concentration (mic)) | ABXBACT |
| 1730-1 | Adenosine triphosphatase (Semen) | CHEM |
| 17300-5 | Mycoplasma hominis Ab (complement fixation) | MICRO |
| 17301-3 | Mycoplasma hominis Ab (qualitative) | MICRO |
| 17302-1 | Mycoplasma pneumoniae Ab (qualitative) | MICRO |
| 17303-9 | Mycoplasma pneumoniae Ab (CSF) | MICRO |
| 17304-7 | Mycoplasma pneumoniae IgG+IgM Ab | MICRO |
| 17305-4 | Myelin IgA Ab (qualitative) | SERO |
| 17306-2 | Myelin IgG Ab (qualitative) | SERO |
| 17307-0 | Myelin IgM Ab (qualitative) | SERO |
| 17308-8 | Myelin associated glycoprotein Ab (immunoblot) | SERO |
| 1731-9 | Adenylate kinase | CHEM |
| 17310-4 | Myelin associated glycoprotein Ab (qualitative, immunofluorescence) | SERO |
| 17311-2 | Myelin associated glycoprotein IgA Ab | SERO |
| 17312-0 | Myelin associated glycoprotein IgG Ab | SERO |
| 17313-8 | Myelin associated glycoprotein IgG Ab (immunofluorescence) | SERO |
| 17314-6 | Myelin associated glycoprotein IgM Ab (immunoassay) | SERO |
| 17315-3 | Myelin basic protein Ab | SERO |
| 17316-1 | Myeloperoxidase Ab (qualitative) | SERO |
| 17317-9 | N-acetylprocainamide (Urine) | DRUG/TOX |
| 17318-7 | Nalbuphine | DRUG/TOX |
| 17319-5 | Nalidixate | DRUG/TOX |
| 1732-7 | Adenylosuccinate lyase | CHEM |
| 17320-3 | Nefazodone (Urine) | DRUG/TOX |
| 17321-1 | Neisseria meningitidis serogroups A+Y Ag (Urine, qualitative) | MICRO |
| 17322-9 | Neisseria meningitidis Ab (qualitative) | MICRO |
| 17323-7 | Neisseria meningitidis Ag (Urine, qualitative) | MICRO |
| 17324-5 | Neisseria meningitidis Ag (CSF, latex agglutination) | MICRO |
| 17325-2 | Neisseria meningitidis serogroups C+w135 Ag (Urine, qualitative) | MICRO |
| 17326-0 | Neisseria meningitidis serogroup A Ag (CSF, qualitative, immunofluorescence) | MICRO |
| 17327-8 | Neisseria meningitidis serogroup B Ab | MICRO |
| 17328-6 | Neisseria meningitidis serogroup B Ag (Urine, qualitative, latex agglutination) | MICRO |
| 17329-4 | Neisseria meningitidis serogroup C Ag (CSF, qualitative, immunofluorescence) | MICRO |