| PARR (PCR for Antigen Receptor Rearrangements) (Colorado) | | EDTA whole blood, lymph node or other organ fluid, cavity fluid, CSF |
| PMSG (Pregnant Mare’s Serum Gonadotropin) (Biovet) | | Serum |
| Potassium Bromide (Université of Montréal) | | Serum | Canine, Equine |
| Potassium Bromide / Phenobarbital Combo (Université of Montréal) | | Serum |
| Potomac Horse Fever (Neorickettsia risticii) RealPCR (IDEXX) | | EDTA whole blood - 2 mL or feces - 5 grams (minimum - 1 gram) | Canine, Equine |
| Premium Canine Thyroid Profile (Michigan) | | Serum | Canine |
| Protein Electrophoresis (Guelph) | | Serum - 0.5 mL; urine - 50 mL |
| Psittacine Beak and Feather Disease DNA (Health Gene) | | Heparinized whole blood, tissue, feces |
| PTH (Hypercalcemia) Malignancy Profile (Michigan) | | Serum - 1 mL and EDTA plasma - 0.5 mL | Canine, Feline |
| PTH (Parathyroid Hormone) and Ionized Calcium (Michigan) | | Serum | Canine, Equine, Feline |
| PTHrP (Parathyroid Hormone Related Protein) (Michigan) | | EDTA plasma |
| Pug Dog Encephalitis, Susceptibility (UC Davis Genetics Lab) | | EDTA whole blood - 3 - 5 mL or Buccal Swab (cytology brush) - 2 - 3 required | Canine |
| Rabies Micro RFFIT Screen Titer (Kansas) | | Serum | Canine, Feline |
| Rabies Titer FAVN – For Export (Kansas) | | Serum | Bovine, Canine, Caprine, Equine, Feline, Mammals, Ovine, Porcine |
| Relaxin (IDEXX) | | Serum or plasma (EDTA or Heparin) |
| Respiratory Disease RealPCR Panel (Comprehensive) (IDEXX) | | Deep pharyngeal swab (with visible organic material on swab) and a conjunctival swab (wipe eye clean, swab inside eyelid). | Canine |
| Rhodococcus equi RealPCR (IDEXX) | | Tracheal wash - 5 - 10 mL, feces - 5 grams | Equine |
| Rickettsia PCR (Vector Borne) | | EDTA whole blood and serum (if available) | Canine, Feline |
| Rickettsia rickettsii IFA (Michigan) | | Serum | Canine, Equine |
| Rickettsia rickettsii PCR (Michigan) | | EDTA whole blood - 2 mL or tick in sterile container |
| Ringworm (Dermatophyte) RealPCR Panel (IDEXX) | | Plucked hair with follicles and skin scrapings from active border of lesion, nails with nail bed scrapings or aspirated purulent material | Canine, Feline |
| Rotavirus/Coronavirus PCR (Guelph) | | Live: feces, rectal swab. Dead: feces. | Equine |
| SDMA (IDEXX) | | Serum, lithium heparin or EDTA plasma | Canine, Equine, Feline |
| Streptococcus equi subsp. equi (Strangles) Antibody ELISA (IDEXX) | | Serum |
| T3 (Health Gene) | | Serum |
| Taurine (UC Davis Amino Acid Lab) | | Heparinized plasma - 1 mL or urine - 5 mL |
| Testosterone (RIA) baseline (Biovet) | | Serum | Caprine, Equine, Feline |
| Testosterone Stimulation hCG (Michigan) | | 2 Serum samples |
| Thyroglobulin Autoantibodies (TgAA) (IDEXX) | | Serum | Canine |
| Thyroid Mini Profile – Canine (IDEXX) | | Serum | Canine |
| Thyroid OFA Registry – Canine (IDEXX) | | Serum | Canine |
| Thyroid Panel – Feline (IDEXX) | | Serum | Feline |
| Thyroid Profile 1 – Canine (IDEXX) | | Serum | Canine |
| Thyroid Profile 1 – Equine (Guelph) | | Serum | Equine |
| Thyroid Profile 2 – Canine (IDEXX) | | Serum | Canine |
| Thyroid Profile Diagnostic – Canine (Michigan) | | Serum | Canine |
| Tick Panel Canine Comprehensive (Vector Borne) | | EDTA whole blood and serum | Canine |
| Tick Panel PCR (Vector Borne) | | EDTA whole blood and serum | Canine, Feline |
| Tick Panel Serology (Vector Borne) | | Serum | Canine |
| Tick/Vector Comprehensive RealPCR Panel (IDEXX) | | EDTA whole blood | Canine |
| Toxoplasma ELISA IgG, IgM – Canine, Feline (Colorado) | | Serum | Canine, Feline |
| Toxoplasma gondii PCR (Colorado) | | EDTA whole blood, TTW or BAL |
| Toxoplasma gondii RealPCR (IDEXX) | | Feces - 5 grams, EDTA whole blood - 2 mL or CSF - 0.5 mL | Canine, Feline |
| Toxoplasma IFA IgG Only – Canine, Feline (IDEXX) | | Serum |
| Toxoplasma IFA IgG, IgM – Canine, Feline (IDEXX) | | Serum | Canine, Feline |
| Toxoplasma IFA IgM Only – Canine, Feline (IDEXX) | | Serum | Canine, Feline |
| Trypsin-Like Immunoreactivity (TLI) – Canine (IDEXX) | | Serum | Canine |
| Trypsin-Like Immunoreactivity (TLI) – Feline (GI Lab) | | Serum | Feline |
| Urine BRAF Mutation Detection Assay (Cadet Braf) (Antech Molecular Innovations) | | Urine | Canine |
| Vitamin D Profile (Michigan) | | Serum or heparinized plasma |
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