| Test | Specimen Requirements |
| Magnesium (Mg) Serum Red Cell Urine | 10 mL GEL (white / yellow). Do not use tourniquet. 10 mL LITHIUM HEPARIN (green). Do not use tourniquet. 24 hr urine collection with no additive. |
| Malarial Parasites | 4mL EDTA (purple) |
| Malaria Antigen Plasmodium falciparum & vivax | 4mL EDTA (purple) |
| Malaria Antibodies* IgG IgM | 10 mL GEL (white / yellow). 10 mL GEL (white / yellow). |
| Manganese* | 10 mL LITHIUM HEPARIN (green). |
| Measles Serology* IgG antibody IgM antibody | 10 mL GEL (white / yellow), May need convalescent specimen 10 mL GEL (white / yellow). |
| Mellerial (Thioridizine)* | 10 mL GEL (white / yellow). |
| Mercury (Hg)* Red Cell Urine | 4ml EDTA (purple) 24 hr urine collection in acid washed bottle or spot urine |
| Metanephrine* Urine | 24 hr urine collection, collected onto 10 mL HCl |
| Methaemoglobin* | 4mL EDTA (purple) |
| Methadone* | 10ml GEL (white / yellow) or 10 ml LITHIUM HEPARIN (green) (Lithium heparin tube preferred) |
| Methylphenobarbitone (Prominal)* | 10 mL GEL (white / yellow). Sample Time: Pre-Dose. State time / date of last dose & time / date of collection. |
| Metoprolol (Betaloc, Lopresor)* | 10 mL GEL (white / yellow). Sample Time: Pre-Dose. State time / date of last dose & time / date of collection. |
| Mexiletine (Mexitil)* | 10 mL GEL (white / yellow). Sample Time: Pre-Dose. |
| Microalbumin (Albumin / Creatinine Ratio) or Albumin excretion rate on a timed sample. | First void morning sample. 24 hr urine (no preservative) or timed urine collection - 8 or 24 hr collection. Period must be clearly stated on the request form. |
| Microfilaria screen (blood film) | 4mL EDTA (purple) |
| Microfilaria Antibodies* | 10 mL GEL (white / yellow). |
| Microglobulin - (Beta 2) | 10 mL GEL (white / yellow). |
| Microsomal Antibodies | 10 mL GEL (white / yellow). |
| Mitochondrial Antibodies | 10 mL GEL (white / yellow). |
| Mogadon (Nitrazepam)* | 10 mL GEL (white / yellow). State time/date of last dose & time/date of collection. |
| Monospot (I.M. / Paul Bunnell) | 10 mL GEL (white / yellow). |
| Mouth Swab Micro & culture | Swab collected onto gel transport medium. |
| Mumps Serology* IgG antibody IgM antibody | 10 mL GEL (white / yellow), May need convalescent specimen 10 mL GEL (white / yellow). |
| Mycoplasma Pneumonia Serology | 10 mL GEL (white / yellow), May need convalescent specimen |
| Myoglobin* | Spot urine, only performed if blood detected in urine. |
| Mycobacterium tuberculosis IgG Detection of antibody to TB infection | 10 mL GEL (white / yellow). |
| Mycobacterium tuberculosis rapid PCR test | Sputum |
| Mysoline (Primidone)* | 10 mL GEL (white / yellow). Sample Time: Pre-Dose. State time / date of last dose & time / date of collection. |