| Fecal Occult Blood | | Feces | Canine, Feline |
| Ferritin ELISA (IDEXX) | | Serum | Canine |
| Ferritin, Iron, TIBC (Kansas) | | Serum | Canine, Equine, Feline |
| Fever of Unknown Origin RealPCR Panel, Comprehensive (IDEXX) | | EDTA whole blood and urine in a sterile container | Canine |
| Fibrinogen (Guelph) | | Citrated plasma | Bovine, Canine, Equine, Feline |
| Fluid Sodium, Potassium, Chloride | | Fluid | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Folate (IDEXX) | | Serum | Canine, Feline |
| Free T4 by Equilibrium Dialysis (Guelph) | | Serum | Canine, Equine, Feline |
| Free T4 Chemiluminescence (IDEXX) | | Serum | Canine, Feline |
| Fructosamine | | Serum | Canine, Feline |
| Fungal Culture | | Hair, skin scrapings, skin biopsy, swabs | Avian (Domestic), Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Fungal Panel Serology (IDEXX) | | Serum | Amphibians, Arthropods, Avian (Domestic), Birds, Bovine, Canine, Caprine, Equine, Feline, Fish, Mammals, Mollusk, Ovine, Porcine, Reptiles, Unknown |
| 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 |
| Herpesvirus sp. PCR | | Tissues - fresh, formalin fixed or embedded | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| High Dose Dexamethasone Suppression Test | | Serum | Canine |
| Immunoglobulin Quantification (IgG) RID (IDEXX) | | Serum | Canine, Feline |
| Immunohistochemistry (IHC) (Companion) | | Formalin-fixed tissues or tissues in paraffin block. | Canine, Equine, Feline |
| 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 |
| Ionized Calcium + PTH + Vitamin D (Vitamin D Profile) (IDEXX) | | Serum or heparinized plasma | Canine, Equine, Feline |
| Itraconazole (IDEXX) | | Serum | Canine, Feline |
| Lawsonia intracellularis PCR (Guelph) | | Feces - 2 grams (minimum) or intestine (ileum preferred) | Canine, Equine, Feline |
| Lead Analysis – Blood | | Heparinized whole blood | Avian (Domestic), Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Leptospira canicola Antibody by Microagglutination – For Export (IDEXX) | | Serum | Canine |
| Leptospira MAT – Not For Export – Canine, Equine (Guelph) | | Serum | Canine, Equine |
| Leptospiral Microscopic Agglutination MAT – For Export (Michigan) | | EDTA plasma or serum | Canine |
| Listeria monocytogenes PCR | | Brain, abscess, liver, lesions, placenta, spleen | Avian (Domestic), Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Low Dose Dexamethasone Suppression Test | | Serum | Canine |
| Luteinizing Hormone (IDEXX) | | Serum | Canine, Equine, Feline |
| Mast Cell Tumor (MCT) Prognostic Panel (Michigan) | | Biopsy slides, unstained and uncoverslipped, from PDS cases - minimum 10 slides | Canine |
| Mastitis Culture | | Milk | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Mercury | | Heparinized whole blood or urine - 2 mL; tissue - liver or kidney (fresh or frozen) - 2 - 5 grams | Amphibians, Arthropods, Avian (Domestic), Birds, Bovine, Canine, Caprine, Equine, Feline, Fish, Mammals, Mollusk, Ovine, Porcine, Reptiles |
| Methemoglobin | | Heparinized whole blood | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Mineral Panel – Single Target (ICPMS) | | Any single test from Mineral Panel #1, #2, #3 or #4 | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Mineral Panel #1 (Blood, Tissue) | | Heparinized plasma or serum - 2 mL; liver (fresh or frozen) - 2 - 5 grams | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Mineral Panel #3 (Blood, Tissue) | | Heparinized blood - 2 mL (must be submitted for Lead); heparinized plasma or serum - 2 mL; tissue (fresh or frozen) - 2 - 5 grams | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Mineral Panel #4 (Blood, Tissue) | | For lead; heparinized whole blood - 2 mL; tissue (fresh or frozen) - 2 - 5 grams | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Modified Knott’s – Heartworm | | Heparinized or EDTA whole blood | Canine |
| Modified Wisconsin | | Feces | Amphibians, Avian (Domestic), Birds, Bovine, Canine, Caprine, Equine, Feline, Fish, Mammals, Ovine, Porcine, Reptiles |
| 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 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 |
| Mycobacterium sp. PCR | | Fixed or fresh tissues, swabs | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Mycoplasma species PCR | | Tissues, swabs | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Myoglobin (Urine) | | Urine | Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Necropsy – Gross and Histo – Insurance or Legal | | Whole animals for post-mortem examination, includes histopathology if required. | Avian (Domestic), Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
| Necropsy – Gross and Histo – Emergency Necropsy | | Whole animals for post-mortem examination outside normal business hours, includes histopathology if required. | Avian (Domestic), Bovine, Canine, Caprine, Equine, Feline, Ovine, Porcine |
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