| Siderocytes | Blood or Marrow | Hematology and Cell counts | LP430621-5 | 2 |
| Sodium | Hair | Chemistry - non-challenge | LP386641-7 | 2 |
| Sodium urate crystals | Urine sediment | Urinalysis | LP402410-7 | 2 |
| Soluble fms-like tyrosine kinase-1 | LP182307-1 | 2 |
| Soluble fms-like tyrosine kinase-1 | Serum | Chemistry - non-challenge | LP385004-9 | 2 |
| Somatomedins | LP15671-8 | 2 |
| Specimen characteristics | LP32762-4 | 2 |
| Specimen volume | Urine | Specimen information | LP404292-7 | 2 |
| Spermatozoa | Urine | Urinalysis | LP402459-4 | 2 |
| Spermatozoa | Urine sediment | Urinalysis | LP402460-2 | 2 |
| Spermatozoa Motile | Semen | Fertility testing | LP400957-9 | 2 |
| Stearoylcarnitine (C18) | DBS | Chemistry - non-challenge | LP381929-1 | 2 |
| Stigmasterol | LP173719-8 | 2 |
| Stigmasterol | Serum or Plasma | Chemistry - non-challenge | LP382496-0 | 2 |
| Streptococcus agalactiae | Throat | Microbiology | LP376012-3 | 2 |
| Streptococcus pyogenes | XXX | Microbiology | LP376021-4 | 2 |
| Streptococcus.beta-hemolytic | LP15187-5 | 2 |
| Suberylcarnitine (C8-DC) | LP19318-2 | 2 |
| Suberylglycine | LP14519-0 | 2 |
| Suberylglycine | Urine | Chemistry - non-challenge | LP383957-0 | 2 |
| Succinate | LP15871-4 | 2 |
| Succinylacetone | LP15872-2 | 2 |
| Succinyladenosine | LP36186-2 | 2 |
| Sulfate | LP15874-8 | 2 |
| Sulfate | Urine | Chemistry - non-challenge | LP386366-1 | 2 |
| Sulfonamide crystals | LP32882-0 | 2 |
| Sulfonamide crystals | Urine sediment | Urinalysis | LP402413-1 | 2 |
| Tacrolimus | LP15182-6 | 2 |
| Tau protein | LP28537-6 | 2 |
| Tau protein | Cerebral spinal fluid | Chemistry - non-challenge | LP384987-6 | 2 |
| Tetradecadienoate (C14:2) | LP33057-8 | 2 |
| Tetradecadienoylcarnitine (C14:2) | LP19321-6 | 2 |
| Tetradecanoylcarnitine (C14) | LP29117-6 | 2 |
| Tetrahydro-11-corticosterone | LP419509-7 | 2 |
| Tetrahydro-11-corticosterone | Urine | Chemistry - non-challenge | LP421924-4 | 2 |
| Tetrahydrocannabinol | Urine | Drug toxicology | LP389649-7 | 2 |
| Tetrahydrofolate | LP15885-4 | 2 |
| Thiamine | Blood | Chemistry - non-challenge | LP385126-0 | 2 |
| Thiamine | Serum or Plasma | Chemistry - non-challenge | LP385127-8 | 2 |
| Thrombin peak | LP426524-7 | 2 |
| Thrombin peak | Platelet poor plasma | Coagulation | LP427481-9 | 2 |
| Thymidine | LP62257-8 | 2 |
| Thyrotropin | DBS | Chemistry - non-challenge | LP381402-9 | 2 |
| Thyroxine free | LP29119-2 | 2 |
| Thyroxine free | Serum or Plasma | Chemistry - non-challenge | LP381519-0 | 2 |
| Thyroxine.albumin bound | LP15042-2 | 2 |
| Transferrin | Serum or Plasma | Chemistry - non-challenge | LP384716-9 | 2 |
| Transitional cells | Urine sediment | Urinalysis | LP402474-3 | 2 |
| Triacylglycerol lipase | LP14915-0 | 2 |
| Trichomonas vaginalis | Genital | Microbiology | LP376928-0 | 2 |
| Tricyclic antidepressants | Urine | Drug toxicology | LP391138-7 | 2 |
| Triglyceride | Stool | Chemistry - non-challenge | LP382510-8 | 2 |
| Triple phosphate crystals | Calculus (stone) | Chemistry - non-challenge | LP386728-2 | 2 |
| Triple phosphate crystals | Urine sediment | Urinalysis | LP402415-6 | 2 |
| Trisomy 18 risk | LP36653-1 | 2 |
| Turbidity | LP19465-1 | 2 |
| Tyrosine crystals | Urine sediment | Urinalysis | LP402417-2 | 2 |
| Unidentified cells | Body fluid | Hematology and Cell counts | LP393329-0 | 2 |
| Unidentified cells | Cerebral spinal fluid | Hematology and Cell counts | LP393330-8 | 2 |
| Unidentified cells | Peritoneal fluid | Hematology and Cell counts | LP393332-4 | 2 |
| Unidentified cells | Pleural fluid | Hematology and Cell counts | LP393333-2 | 2 |
| Unidentified cells | Synovial fluid | Hematology and Cell counts | LP393334-0 | 2 |
| Unidentified crystals | LP16850-7 | 2 |
| Unidentified crystals | Urine sediment | Urinalysis | LP402418-0 | 2 |
| Unspecified cells | LP18364-7 | 2 |
| Unspecified cells | Body fluid | Hematology and Cell counts | LP393325-8 | 2 |
| Urate | Calculus (stone) | Chemistry - non-challenge | LP383579-2 | 2 |
| Urate | Serum or Plasma | Chemistry - non-challenge | LP383583-4 | 2 |
| Urate crystals | Calculus (stone) | Chemistry - non-challenge | LP386729-0 | 2 |
| Urate crystals | Urine sediment | Urinalysis | LP402420-6 | 2 |
| Urate crystals amorphous | LP18118-7 | 2 |
| Urate crystals amorphous | Urine sediment | Urinalysis | LP402422-2 | 2 |
| Urate dihydrate crystals | LP18870-3 | 2 |
| Urate dihydrate crystals | Calculus (stone) | Chemistry - non-challenge | LP383594-1 | 2 |
| Uridine | LP99932-3 | 2 |
| Uroporphyrin | Serum or Plasma | Chemistry - non-challenge | LP386520-3 | 2 |
| Uroporphyrin 1 isomer | LP18653-3 | 2 |
| Uroporphyrin 3 isomer | LP18654-1 | 2 |
| Vaccenate (C18:1w7) | LP33072-7 | 2 |
| Valine | DBS | Chemistry - non-challenge | LP384437-2 | 2 |
| Valine | Serum or Plasma | Chemistry - non-challenge | LP384440-6 | 2 |
| Variant lymphocytes | Body fluid | Hematology and Cell counts | LP392966-0 | 2 |
| Variant lymphocytes | Cerebral spinal fluid | Hematology and Cell counts | LP392967-8 | 2 |
| Variant lymphocytes | Peritoneal fluid | Hematology and Cell counts | LP392968-6 | 2 |
| Variant lymphocytes | Pleural fluid | Hematology and Cell counts | LP392969-4 | 2 |
| Variant lymphocytes | Synovial fluid | Hematology and Cell counts | LP392970-2 | 2 |
| Viscosity | LP15950-6 | 2 |
| Vitamin A | LP31687-4 | 2 |
| Vitamin B12 | LP31689-0 | 2 |
| Vitamin B2 | LP31690-8 | 2 |
| Vitamin C | LP31695-7 | 2 |
| von Willebrand factor (vWf) multimers | LP16907-5 | 2 |
| von Willebrand factor (vWf) multimers | Platelet poor plasma | Coagulation | LP394242-4 | 2 |
| von Willebrand factor (vWf).activity | LP135005-9 | 2 |
| von Willebrand factor (vWf).activity | Platelet poor plasma | Coagulation | LP394235-8 | 2 |
| Waxy casts | Urine sediment | Urinalysis | LP402454-5 | 2 |
| WBC casts | Urine sediment | Urinalysis | LP402457-8 | 2 |
| Xanthopterin | LP200577-7 | 2 |
| Yeast | Urine sediment | Urinalysis | LP402490-9 | 2 |
| 1-deoxymethylsphinganine | LP435915-6 | 1 |