| Tubular cells | LP15194-1 | 1 |
| Tubular cells | Urine sediment | Urinalysis | LP402475-0 | 1 |
| Tumor necrosis factor.alpha | LP18480-1 | 1 |
| Tumor necrosis factor.alpha | Serum or Plasma | Chemistry - non-challenge | LP385059-3 | 1 |
| Turbidity | Body fluid | Specimen information | LP404311-5 | 1 |
| Turbidity | Cerebral spinal fluid | Specimen information | LP404312-3 | 1 |
| Tyrosine | Amniotic fluid | Chemistry - non-challenge | LP384411-7 | 1 |
| Tyrosine | Cerebral spinal fluid | Chemistry - non-challenge | LP384415-8 | 1 |
| Tyrosine | DBS | Chemistry - non-challenge | LP384413-3 | 1 |
| Tyrosine | Serum or Plasma | Chemistry - non-challenge | LP384416-6 | 1 |
| Unidentified cells | Pericardial fluid | Hematology and Cell counts | LP393331-6 | 1 |
| Unstable Hemoglobin | LP16463-9 | 1 |
| Unstable Hemoglobin | Red Blood Cells | Hematology and Cell counts | LP393668-1 | 1 |
| Uracil | Cerebral spinal fluid | Chemistry - non-challenge | LP383560-2 | 1 |
| Uracil | Serum or Plasma | Chemistry - non-challenge | LP383561-0 | 1 |
| Uracil | Urine | Chemistry - non-challenge | LP383562-8 | 1 |
| Urate | Cerebral spinal fluid | Chemistry - non-challenge | LP383580-0 | 1 |
| Urate | Synovial fluid | Chemistry - non-challenge | LP383584-2 | 1 |
| Urea | Dialysis fluid | Chemistry - non-challenge | LP385435-5 | 1 |
| Urea | Dialysis fluid peritoneal | Chemistry - non-challenge | LP385436-3 | 1 |
| Urea | Serum or Plasma | Chemistry - non-challenge | LP385441-3 | 1 |
| Urea | Urine | Chemistry - non-challenge | LP385444-7 | 1 |
| Urea | XXX | Chemistry - non-challenge | LP385446-2 | 1 |
| Urea nitrogen | Blood arterial | Chemistry - non-challenge | LP385454-6 | 1 |
| Urea nitrogen | Body fluid | Chemistry - non-challenge | LP385457-9 | 1 |
| Urea nitrogen | Dialysis fluid | Chemistry - non-challenge | LP385459-5 | 1 |
| Urease | LP30744-4 | 1 |
| Urease | Tissue and Smears | Microbiology | LP374951-4 | 1 |
| Uridine | Cerebral spinal fluid | Chemistry - non-challenge | LP383280-7 | 1 |
| Uridine | Serum or Plasma | Chemistry - non-challenge | LP383281-5 | 1 |
| Urobilinogen | Urine | Chemistry - non-challenge | LP385341-5 | 1 |
| Uroporphyrin 1 isomer | Stool | Chemistry - non-challenge | LP386525-2 | 1 |
| Uroporphyrin 1 isomer | Urine | Chemistry - non-challenge | LP386526-0 | 1 |
| Uroporphyrin 3 isomer | Stool | Chemistry - non-challenge | LP386529-4 | 1 |
| Uroporphyrin 3 isomer | Urine | Chemistry - non-challenge | LP386530-2 | 1 |
| Ursodeoxycholate | LP93479-1 | 1 |
| Ursodeoxycholate | Serum or Plasma | Chemistry - non-challenge | LP411450-2 | 1 |
| Vaccenate (C18:1w7) | Red Blood Cells | Chemistry - non-challenge | LP382095-0 | 1 |
| Vaccenate (C18:1w7) | Serum or Plasma | Chemistry - non-challenge | LP382096-8 | 1 |
| Valine | Amniotic fluid | Chemistry - non-challenge | LP384435-6 | 1 |
| Valine | Cerebral spinal fluid | Chemistry - non-challenge | LP384439-8 | 1 |
| Valproate | LP16305-2 | 1 |
| Valproate | Serum or Plasma | Drug toxicology | LP390867-2 | 1 |
| Vanillylmandelate | Cerebral spinal fluid | Chemistry - non-challenge | LP381235-3 | 1 |
| Vanillylmandelate | Serum or Plasma | Chemistry - non-challenge | LP381237-9 | 1 |
| Varicella zoster virus | LP14853-3 | 1 |
| Varicella zoster virus | XXX | Microbiology | LP379081-5 | 1 |
| Vascular adhesion protein 1 | LP185746-7 | 1 |
| Vascular adhesion protein 1 | Serum or Plasma | Chemistry - non-challenge | LP384993-4 | 1 |
| Vascular endothelial growth factor A | LP185747-5 | 1 |
| Vascular endothelial growth factor A | Serum or Plasma | Chemistry - non-challenge | LP385006-4 | 1 |
| Vasoactive intestinal peptide | LP15948-0 | 1 |
| Vasoactive intestinal peptide | Serum or Plasma | Chemistry - non-challenge | LP386777-9 | 1 |
| Vasopressin | LP15949-8 | 1 |
| Vasopressin | Serum or Plasma | Chemistry - non-challenge | LP381411-0 | 1 |
| Virus | XXX | Microbiology | LP444663-1 | 1 |
| Viscosity | Semen | Specimen information | LP404329-7 | 1 |
| Viscosity | Serum | Specimen information | LP404330-5 | 1 |
| Vitamin B3 | LP31691-6 | 1 |
| Vitamin D+Metabolites | LP33184-0 | 1 |
| Vitamin D+Metabolites | Serum or Plasma | Chemistry - non-challenge | LP385198-9 | 1 |
| Vitamin K1 | LP31700-5 | 1 |
| von Willebrand evaluation | LP62800-5 | 1 |
| von Willebrand evaluation | Platelet poor plasma | Coagulation | LP394249-9 | 1 |
| von Willebrand factor (vWf) cleaving protease | LP32458-9 | 1 |
| von Willebrand factor (vWf) cleaving protease | Platelet poor plasma | Coagulation | LP394239-0 | 1 |
| Voriconazole | LP30491-2 | 1 |
| Voriconazole | Serum or Plasma | Drug toxicology | LP389090-4 | 1 |
| X ray dye crystals | LP36424-7 | 1 |
| X ray dye crystals | Urine sediment | Urinalysis | LP402423-0 | 1 |
| X-linked adrenoleukodystrophy | LP242687-4 | 1 |
| X-linked adrenoleukodystrophy | DBS | Chemistry - non-challenge | LP385906-5 | 1 |
| Xanthine | Cerebral spinal fluid | Chemistry - non-challenge | LP383599-0 | 1 |
| Xanthine | Serum or Plasma | Chemistry - non-challenge | LP383601-4 | 1 |
| Xanthine | Urine | Chemistry - non-challenge | LP383602-2 | 1 |
| Xanthopterin | Cerebral spinal fluid | Chemistry - non-challenge | LP384317-6 | 1 |
| Xanthopterin | Serum or Plasma | Chemistry - non-challenge | LP384318-4 | 1 |
| Yeast | XXX | Microbiology | LP376479-4 | 1 |
| Yeast.budding | Urine sediment | Urinalysis | LP402492-5 | 1 |
| Yeast.hyphae | Urine sediment | Urinalysis | LP402494-1 | 1 |
| Yeast.pseudohyphae | LP35888-4 | 1 |
| Yeast.pseudohyphae | Urine sediment | Urinalysis | LP402495-8 | 1 |
| Yersinia sp | LP16783-0 | 1 |
| Yersinia sp | XXX | Microbiology | LP444560-9 | 1 |
| YKL-40 | LP62856-7 | 1 |
| YKL-40 | Serum | Chemistry - non-challenge | LP386171-5 | 1 |
| Zinc | Blood | Drug toxicology | LP388538-3 | 1 |
| Zinc | Red Blood Cells | Drug toxicology | LP388545-8 | 1 |
| Zinc | Serum or Plasma | Drug toxicology | LP388548-2 | 1 |
| Zonisamide | LP28438-7 | 1 |
| Zonisamide | Serum or Plasma | Drug toxicology | LP390878-9 | 1 |