| Free T4 by Equilibrium Dialysis (Guelph) | | Serum | Canine, Equine, Feline |
| Free T4 Chemiluminescence (IDEXX) | | Serum | Canine, Feline |
| Fungal Panel Serology (IDEXX) | | Serum | Amphibians, Arthropods, Avian (Domestic), Birds, Bovine, Canine, Caprine, Equine, Feline, Fish, Mammals, Mollusk, Ovine, Porcine, Reptiles, Unknown |
| Gentamicin (RUH) | | Serum |
| Heartworm Antigen by ELISA – Canine, Feline (IDEXX) | | 1 mL serum (preferred) or EDTA plasma for ELISA; 2 ml EDTA whole blood for microfilaria test | Canine, Feline |
| Heartworm Microfilaria Knott’s Test – For Export (IDEXX) | | EDTA whole blood | Canine, Feline |
| Hyperkalemic Periodic Paralysis (HYPP) (IDEXX) | | EDTA whole blood (LTT) - 2 mL or 15-20 plucked mane hairs with follicle | Equine |
| IgG Screen (Qualitative) (IDEXX) | | Serum, EDTA whole blood or plasma | Equine |
| Immunocytochemistry (ICC) (Colorado) | | 4 air dried unstained smears |
| Immunoglobulin Quantification (IgG) RID (IDEXX) | | Serum | Canine, Feline |
| Infectious Bronchitis Virus (IBV) ELISA (Guelph) | | Serum | Avian (Domestic) |
| Influenza A, H3N8 HI (Guelph) | | Serum |
| Influenza A, H7N7 HI (Guelph) | | Serum |
| Insulin (RIA)/Glucose Ratio (Guelph) | | Serum | Canine, Feline |
| Insulin RIA (Guelph) | | Serum | Canine, Feline |
| Insulin-Like Growth Factor-1 (IGF1) (IDEXX) | | Serum or plasma | Canine, Equine, Feline |
| Iodine – ICP-MS (Milk, Tissues and Feed) (Guelph) | | Milk - 5 mL raw or processed, fresh tissues - 10 grams, or feed - 100 gram |
| Iodine-ICP-MS (Blood and Urine) (Guelph) | | Serum, heparinized plasma, or urine |
| Ionized Calcium + PTH + Vitamin D (Vitamin D Profile) (IDEXX) | | Serum or heparinized plasma | Canine, Equine, Feline |
| Ionophore Feed Additive Screen (Guelph) | | Feed - 100 grams or rumen contents |
| Iron/TIBC (St. Paul’s) | | Serum |
| Itraconazole (IDEXX) | | Serum | Canine, Feline |
| Lawsonia intracellularis PCR (Guelph) | | Feces - 2 grams (minimum) or intestine (ileum preferred) | Canine, Equine, Feline |
| Leishmania IFA (Michigan) | | Serum |
| Leishmania infantum Antibody Screen IFA – For Export (Kansas) | | Serum |
| Leptin – Equine (IDEXX) | | Serum and EDTA plasma | Equine |
| Leptospira canicola Antibody by Microagglutination – For Export (IDEXX) | | Serum | Canine |
| Leptospira MAT – Not For Export – Canine, Equine (Guelph) | | Serum | Canine, Equine |
| Leptospira MAT – Not for Export – Food Animal (Guelph) | | Serum | Bovine, Caprine, Ovine, Porcine |
| Leptospira spp. PCR (Guelph) | | Live: EDTA whole blood and urine - 2 mL each. Dead: kidney tissue. |
| Leptospiral Microscopic Agglutination MAT – For Export (Michigan) | | EDTA plasma or serum | Canine |
| Luteinizing Hormone (IDEXX) | | Serum | Canine, Equine, Feline |
| Lyme Antibody by IFA (IDEXX) | | Serum | Equine |
| Lyme Disease Multiplex – Equine (IDEXX) | | Serum - 2 mL; for neurological cases include CSF - 1 mL | Equine |
| Mast Cell Tumor (MCT) Prognostic Panel (Michigan) | | Biopsy slides, unstained and uncoverslipped, from PDS cases - minimum 10 slides | Canine |
| Metanephrine Fractionation, Urine (IDEXX) | | Urine - 5 mL in sulfamic acid tube |
| Microfilaria Differentiation – For Export (Michigan) | | EDTA whole blood |
| Multi-APP (Actinobacillus pleuropneumoniae Serology) (Université of Montréal) | | Serum |
| Multi-Drug Resistance Gene (MDR1; Ivermectin Sensitivity) (Health Gene) | | EDTA whole blood | Canine |
| Muscle and Nerve Profile – 1st Nerve and Muscle (IDEXX) | | Peripheral nerve biopsy specimen approx. 2.5 cm in length divided, and a muscle biopsy (approx. 0.5 X 0.5 X 1.0 cm). | Canine, Feline |
| Muscle and/or Nerve – each additional (Comp Neuro Lab) | | Muscle and/or nerve biopsy |
| Muscle Profile Complete Tissue- 1st Muscle (IDEXX) | | Muscle biopsy (approx. 0.5 X 0.5 X 1.0 cm) taken from an affected, but not end-stage, muscle by an open biopsy procedure. | Canine, Feline |
| Myasthenia Gravis (Acetylcholine Receptor Antibody) (IDEXX) | | Serum (preferred) or heparinized plasma | Canine, Feline |
| Mycoplasma hyopneumoniae MFIA (Biovet) | | Serum |
| Mycoplasma sp. Identification by gene squencing (RO) | | Genetic material |
| Neospora sp. Antibody IFA (IDEXX) Canine | | Serum | Canine |
| Neospora spp. PCR (IDEXX) | | CSF |
| Non-esterified fatty acids (NEFA) (Guelph) | | Serum or EDTA plasma - 0.5 mL |
| Osmolality (RUH) | | Li-Heparin Plasma (preferred sample), serum, misc fluid and urine |
| Pancreatic Lipase Immunoreactivity (PLI) (Health Gene) | | Serum | Canine, Feline |
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