Test Index - T

T Cells (CD3+)     see CD4/8 counts (T Lymphocyte subsets)

T Lymphocyte subsets     see CD4/8 counts (T Lymphocyte subsets)

Tau protein - CSF     see dementia biomarkers (CSF)

Tau transferrin (?CSF fluid)     see beta-2 transferrin (for ?CSF-containing fluids)

Tegretol    see carbamazepine

Tetanus immunity     see vaccine immunity testing

TGN     see 6-TGN and 6-MMPN

Thalassaemia screen    see haemoglobinopathy screen

Thiamine     see vitamin B₁

Therapeutic heparin ratio    see APTT ratio - therapeutic heparin ratio

Thioguanine nucleotides and methylmercaptopurine nucleotides     see 6-TGN and 6-MMPN

Thiopurine methyltransferase     see TPMT

Thyroglobulin antibody - only offered routinely as part of thyroglobulin testing.

Thyroid function tests     see TFT

Thyroid peroxidase antibody     see TPO antibody

Thyroid receptor antibody (TRAb)

Tick-borne Encephalitis (TBE)     see tropical virus serology

Tinzaparin (Innohep)     see Heparin assay (Anti-Xa)

Tissue transglutaminase (TTG) antibody     see tTG antibody

Tocopherol     see vitamin E

ToRC screen     see Gestational infections (ToRC) - diagnostic virology

Total bilirubin     see bilirubin (total)

Total Tau and A-Beta 1-42 (CSF)     see dementia biomarkers (CSF)

Total:HDL cholesterol ratio     see lipid profile

Toxicology

For therapeutic drug monitoring see individual drugs

Toxoplasma (toxoplasmosis)     see also

 - diagnostic virology: eye infection molecular detection meningitis/encephalitis, lymphadenopathy, and gestational infections,

 - baseline serology for HIV positive patients, baseline serology for Haematology/Oncology patients, and transplant donor/recipient serology screen.

TPN trace element profile (for parenteral nutrition profile click here)

TRAb     see thyroid receptor antibody

Trace elements    request individual elements unless requesting in TPN patient with TPN trace element profile.

Transferrin, transferrin saturation    see iron studies

Transferrin isoforms (transferrin glycoforms, transferrin isoelectric focusing)

Treponema     see syphilis

Triglycerides (triacylglycerol)     see lipid profile

Trimethylaminuria ("fish odour syndrome").

"Triple" test     see Down's, Edwards’ and Patau’s syndrome screening

TSVT     see taipan snake venom time (TSVT) and ecarin time (ET)

Trypsinogen    see immunoreactive trypsinogen

Tryptase

Tubular phosphate reabsorption     see phosphate (urine)

Tyrosine     see PKU monitoring