| YTBLMP | T and B Lymphocyte Panel | — |
| YTGAMA | T-Cell Receptor Gamma Chain Rearrangement by DNA Amplification | — |
| YT3UR | T3 Uptake | — |
| YFT4P | T4, Free & TSH | Electrochemiluminescence Immunoassay |
| YT4T8 | T4/T8 Ratio | — |
| YTACR | Tacrolimus (FK506) Level | — |
| YCDTAP | Tapentadol & Metabolite, UR, Quant | — |
| YTBGOLD | TB Interferon Antigen Response (QuantiFERON-TB Gold) | — |
| YTBNK | TBNK Lymph Assay | — |
| YTEST | Testosterone | Electrochemiluminescence Immunoassay |
| YTSFED | Testosterone (Total) & Free by Equilibrium Dialysis | — |
| YTBIO | Testosterone, Bioavailable & SHBG, Adult Male | — |
| YTSTP | Testosterone, Free & Total w/ SHBG (Adult Male and Female ≥19 y/o) | Electrochemiluminescence Immunoassay |
| YTESTOS | Testosterone, Free and Total, Females or Children | Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry/Electrochemiluminescent Immunoassay/Calculation |
| YFREETM | Testosterone, Free, Adult Male by ED/LC-MS/MS | — |
| YFDTEST | Testosterone, Free, Direct | Direct Analog Enzyme Immunoassay (EIA) |
| YTETG | Tetanus Antibody, IgG | — |
| YTHEVP | Thalassemia and Hemoglobinopathy Evaluation | — |
| YTHAUR | Thallium, Urine, 24 Hr. or Random | — |
| YTHAL | Thallium, Whole Blood | — |
| YCDTHC | THC Confirmation, Urine | — |
| YTHCSQ | THC Metabolite, Serum, Quantitative | — |
| YTHEO | Theophylline | — |
| YTPP | ThinPrep Imaged Pap | ThinPrep processing system |
| YTPAB | ThinPrep Imaged Pap Age Based Testing | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPABGC | ThinPrep Imaged Pap Age Based Testing + GC/CT | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPABGCT | ThinPrep Imaged Pap Age Based Testing + GC/CT/TV | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPHPV | ThinPrep Imaged Pap w/ HPV High Risk Screen | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPHPVRG | ThinPrep Imaged Pap w/ HPV High Risk Screen & Reflex to Genotyping | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPRABG | ThinPrep Imaged Pap w/ Reflex to HPV & Genotyping any Abnormal | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPABGCTA | ThinPrep Imaged Pap w/ Reflex to HPV & Genotyping if ASCUS | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPRAB | ThinPrep Imaged Pap w/ Reflex to HPV any Abnormal Diagnosis | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTPRASC | ThinPrep Imaged Pap w/ Reflex to HPV if ASCUS | Target Amplified Nucleic Acid Probe; ThinPrep processing system |
| YTHIOC | Thiocyanate, Serum | — |
| YTHMTB | Thiopurine Metabolites (6MMP & 6TGN) | — |
| YTHIO | Thiopurine Methyltransferase (TPMT), Enzyme Activity, RBC | — |
| YTHDZ | Thioridazine (Mellaril) | — |
| YTHRZ | Thorazine (Chlorpromazine) | — |
| YTTIM | Thrombin Time | — |
| YFFTAC | Thrombin-Antithrombin Complex | — |
| YTHYDEO | Thymidine and Deoxyuridine Analytes (Plasma) | Liquid chromatography/tandem mass spectrometry (LC/MS-MS) |
| YTHYGMS | Thyroglobulin by LC-MS/MS | — |
| YTHYGB | Thyroglobulin, Total | — |
| YHTGR | Thyroglobulin, Tumor Marker Reflex, Serum | — |
| YTHYG | Thyroglobulin, Tumor Marker, Serum (Includes: Thyroglobulin and Thyroglobulin Antibody) | — |
| YTHYAPS | Thyroid Antibodies (Includes ATG and A-TPO) | Electrochemiluminescence Immunoassay |
| YTRAB | Thyroid Hormone Receptor Antibody (TRAb) (Thyrotropin) | Quantitative Electrochemiluminescent Immunoassay (ECLIA) |
| YATPO | Thyroid Peroxidase (TPO) Ab | Electrochemiluminescence Immunoassay |
| YTHYRN | Thyroid Profile Reflex | Electrochemiluminescence Immunoassay |
| YTSHN | Thyroid Stimulating Hormone | Electrochemiluminescence Immunoassay |
| YTSIM | Thyroid Stimulating Immunoglobulin | Semi-Quantitative Chemiluminescent Immunoassay (CLIA) |
| YTBG | Thyroxine Binding Globulin (TBG) | — |
| YTIG | Tiagabine (Gabitril) | — |
| YTIDR | Tick Identification w/reflex to Borrelia Species by PCR | — |
| YTICKPCR | Tick-Borne Disease Panel by PCR, Blood | — |
| YTISCU | Tissue Culture | — |
| AP BX | Tissue Pathology | — |
| YTPAA | Tissue Plasminogen Activator, Antigen | — |
| YTTG | Tissue Transglutaminase (tTG) IgA | — |
| YTTAFER | Tissue Transglutaminase Ab, IgA w/Reflex | — |
| YTTIG | Tissue Transglutaminase IgG Ab | — |
| YTNMQ | Titanium, Quantitative | — |
| YTMAO | TMAO (Trimethylamine N-oxide) | Nuclear magnetic resonance (NMR) |
| YTOBRAP | Tobramycin, Peak | — |
| YTOBRAR | Tobramycin, Random | — |
| YTOBRAT | Tobramycin, Trough | — |
| YTLRFA | Toll-Like Receptor Function Assay | — |
| YTOMATO | Tomato IgE | — |
| YTOPIR | Topiramate (Topamax) | — |
| YTORC | Torch Antibodies, IgG | — |
| YTORCHM | TORCH Antibodies, IgM | — |
| YXBIL | Total and Conjugated Bilirubin | Photometric, Colormetric Diazo Method |
| YTP | Total Protein | Colorimetric Endpoint Biuret Method |
| YBTP | Total Protein, Body Fluid | Colorimetric Endpoint Biuret Method |
| YCFP | Total Protein, CSF | — |
| YT3 | Total T3 | Electrochemiluminescence Immunoassay |
| YT4 | Total T4 | Electrochemiluminescence Immunoassay |
| YFBIL | Total, Direct, and Indirect Bilirubin | Photometric, Colormetric Diazo Method |
| YTXCAG | Toxocara Antibody, IgG | — |
| YTOXO | Toxoplasma gondii Antibody, IgG | — |
| YTXPM | Toxoplasma gondii Antibody, IgM | — |
| YTGPR | Toxoplasma gondii by PCR | — |
| YTPMTGN | TPMT and NUDT15 Genotyping | — |
| YTPSAB1 | TPSAB1 Copy Number Analysis by ddPCR | — |
| YCDTRAM | Tramadol & Metabolite, UR, Quant | — |
| YTRAMQ | Tramadol and Metabolite, Quant Serum or Plasma | — |
| YTRAMUR | Tramadol, Urine Screen w/reflex to Quant | — |
| YTRFR | Transferrin | — |
| YTGFBP | Transforming Growth Factor beta, Plasma | — |
| YTGFBS | Transforming Growth Factor beta, Serum | — |
| YTRAZ | Trazodone (Desyrel) | — |
| YTPATPA | Treponema pallidum Antibody by TP-PA | — |
| YTPIFA | Treponema pallidum Antibody, IgG by IFA, Serum | — |
| YTRICAB | Trichinella Antibody | — |
| YTRICRNA | Trichomonas RNA | Transcription-Mediated Amplification |
| YTAD | Tricyclic Antidepressants, Quantitative, Serum | — |
| YTADQNT | Tricyclic Antidepressants, Urine Quantitation | — |
| YTRIG | Triglycerides | Enzymatic Colorimetric Method |
| YBTRI | Triglycerides, Body Fluid | Enzymatic Colorimetric Method |
| YTWP | Tropheryma whipplei by PCR | — |
| YHSTROP | Troponin I | — |
| YTROPT | Troponin T | — |
| YTRPAG | Trypanosoma cruzi IgG | — |
| YTRYP | Trypsin, Serum | — |
| YTRPT | Tryptase | — |
| YTNF | Tumor Necrosis Factor - alpha | — |
| YTYIAS | Type and Screen | — |
| YTYSAB | Tysabri Antibodies | — |
