Biomarker Lens

Common biomarkers

  • Hemoglobin
  • Glucose
  • ALT
  • Apolipoprotein B
  • C-Reactive Protein, Cardiac
  • Ferritin
  • Alb/Creat Ratio, Urine
  • Alkaline Phosphatase
  • FSH
  • T4,Free(Direct)

Biomarkers · Chemical

Thyroxine (T4)

Thyroxine is also called T4. T4 is a hormone that your thyroid gland makes.

Thyroxine (T4) Test, MedlinePlus, National Library of Medicine

Primary unit
ug/dL
LOINC codes
3026-2
Tests that measure Thyroxine (T4)
Labcorp 8, Quest Diagnostics 4

Tests

Check the catalog code, specimen, method and preparation for every test that measures Thyroxine (T4). Select up to five tests to compare them side by side.

Labcorp 8 tests

Single-analyte tests

  • Thyroxine (T4) 001149

    Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    Electrochemiluminescence Immunoassay (ECLIA) This assay is performed on the Roche cobas instrument in multiple laboratories throughout Labcorp.
    Collection
    If a red-top tube or plasma is used, transfer separated serum or plasma to a plastic transport tube.
    Reference notes
    4.5−12.0 μg/dL1,2
    Labcorp catalog page

Panels that include this biomarker

  • Thyroxine (T4) and Thyroid-stimulating Hormone (TSH) 024026

    2 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Collection
    If a red-top tube or plasma is used, transfer separated serum or plasma to a plastic transport tube.
    Labcorp catalog page

  • Thyroid Profile 000455

    3 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    Electrochemiluminescence Immunoassay (ECLIA) This assay is performed on the Roche cobas instrument in multiple laboratories throughout Labcorp.
    Collection
    If a red-top tube or plasma is used, transfer separated serum or plasma to a plastic transport tube.
    Labcorp catalog page

  • Thyroxine (T4), Thyroxine-binding Globulin (TBG), and T4−TBG Index 004457

    3 analytes · Serum · Fasting not stated · Turnaround 2 - 3 days

    Method and collection
    Collection
    If a red-top tube is used, transfer separated serum to a plastic transport tube.
    Labcorp catalog page

  • Thyroid Profile With TSH 000620

    4 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    See individual tests.
    Collection
    If a red-top tube or plasma is used, transfer separated serum or plasma to a plastic transport tube.
    Labcorp catalog page

  • Thyroid Profile II, Comprehensive 027011

    5 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    See individual tests.
    Collection
    If a red-top tube is used, transfer separated serum to a plastic transport tube.
    Labcorp catalog page

Quest Diagnostics 4 tests

Panels that include this biomarker

  • T4 (Thyroxine), Total 867

    2 analytes · Serum · Fasting not stated · Turnaround Set up: Mon-Sat; Report available: 3 days

    Method and collection
    Method
    Immunoassay (IA)
    Collection
    Note: Free T4 Index (T7) will only be calculated and reported if test code code 861 (T3 Uptake) is ordered as well.
    Reference notes
    Male (mcg/dL) | Female (mcg/dL) <1 Month | 4.5-17.2 | 4.5-17.2 1-23 Months | 5.9-13.9 | 5.9-13.9 2-12 Years | 5.7-11.6 | 5.7-11.6 13-20 Years | 5.1-10.3 | 5.3-11.7 >20 Years | 4.9-10.5 | 5.1-11.9
    Quest Diagnostics catalog page

  • T4 Free, Direct Dialysis and T4 Total 36725

    2 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Equilibrium Dialysis • Chromatography/Mass Spectrometry • Chemiluminescence (CL)
    Preparation
    Fasting preferred
    Collection
    Please specify the patient's age on the request form
    Reference notes
    T4, Free Direct Dialysis Adult 0.9-2.2 ng/dL Prematures, 25-30 Weeks Birth-7 Days 0.5-3.3 ng/dL Prematures, 31-36 Weeks Birth-7 Days 1.3-4.7 ng/dL Cord Blood, >37 Weeks 1.2-2.2 ng/dL Birth-4 Days 2.2-5.3 ng/dL 2 Months-2 Years 1.2-2.5 ng/dL 3 Years-17 Years 1.0-2.4 ng/dL Pregnancy First Trimester 0.9-2.0 ng/dL Second Trimester 0.8-1.5 ng/dL Third Trimester 0.8-1.7 ng/dL T4, Total <1 Month Not established 1-23 Months 6.0-13.2 mcg/dL 2-12 Years 5.5-12.1 mcg/dL 13-20 Years 5.5-11.1 mcg/dL >20 Years 4.8-10.4 mcg/dL Pregnancy First Trimester 6.4-15.2 mcg/dL Second Trimester 7.4-15.2 mcg/dL Third Trimester 7.7-13.8 mcg/dL All TrimestersTogether 7.0-14.7 mcg/dL
    Quest Diagnostics catalog page

  • Thyroid Panel 7020

    3 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Immunoassay (IA)
    Reference notes
    T3 Uptake 22-35 % T4 (Thyroxine), Total Male (mcg/dL) Female (mcg/dL) <1 Month 4.5-17.2 4.5-17.2 1-23 Months 5.9-13.9 5.9-13.9 2-12 Years 5.7-11.6 5.7-11.6 13-20 Years 5.1-10.3 5.3-11.7 >20 Years 4.9-10.5 5.1-11.9 Free T4 Index (T7) 1.4-3.8
    Quest Diagnostics catalog page

  • Thyroid Panel with TSH 7444

    4 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Immunoassay (IA)
    Preparation
    Specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For patients on hemodialysis, specimen collection should be delayed for 2 weeks. According to the assay manufacturer Siemens: "Samples containing fluorescein can produce falsely depressed values when tested with the Advia Centaur TSH3 Ultra assay."
    Reference notes
    See individual tests
    Quest Diagnostics catalog page

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We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

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