Biomarkers · Chemical

T3, Free, Dialysis, LC/MS-MS

A triiodothyronine (T3) test measures the level of T3 in a sample of your blood. It's used to help diagnose thyroid disease.

Triiodothyronine (T3) Tests, MedlinePlus, National Library of Medicine

Primary unit: pg/mL
LOINC codes: 29239-1
Tests that measure T3, Free, Dialysis, LC/MS-MS: Labcorp 1, Quest Diagnostics 1

Ranges

Each lab publishes a reference range for the population groups it tests, usually the middle 95% of results. These intervals describe that population, not an optimal or healthy target. How ranges differ

Quest Diagnostics, T3 Free, Tracer Dialysis 36598

Population	Interval
Free T3, 1-9 Years	282-518 pg/dL
Free T3, 10-13 Years	286-556 pg/dL
Free T3, 14-17 Years	242-501 pg/dL
Free T3, Adult	210-440 pg/dL
Free T3, Pregnancy (all trimesters)	200-380 pg/dL
T3, Total, <1 Month	Not established
T3, Total, 1-23 Months	117-239 ng/dL
T3, Total, 2-12 Years	105-207 ng/dL
T3, Total, 13-20 Years	86-192 ng/dL
T3, Total, >20 Years	76-181 ng/dL

Quest Diagnostics test catalog, 36598

Tests

Check the catalog code, specimen, method and preparation for every test that measures T3, Free, Dialysis, LC/MS-MS. Select up to five tests to compare them side by side.

Labcorp 1 test

Single-analyte tests

Triiodothyronine (T3), Free, Dialysis and LC/MS-MS (Endocrine Sciences) 503600
Serum · Fasting not stated · Turnaround 6 - 10 days
Method and collection
Method
Equilibrium dialysis and high-pressure liquid chromatography/tandem mass spectrometry (HPLC/MS-MS)
Collection
Serum/plasma must be separated from cells within 45 minutes of venipuncture. Send serum/plasma in a plastic transfer tube.
Reference notes
See table. Age Range (pg/mL) Mean (pg/mL) Premature (0 to 4 wk) 1.35−6.25 3.13 Newborn 0 to 2 wk 0.99−8.03 4.21 2 wk to 12 m 1.59−6.15 3.87 Prepubertal 1 to 10 y 2.21−4.99 3.60 Children >10 y and adults 1.81−4.06 2.77 Pregnant female first trimester 1.6−3.3 2.5 second trimester To be determined third trimester 1.0−3.2 2.1
Labcorp catalog page

Quest Diagnostics 1 test

Panels that include this biomarker

T3 Free, Tracer Dialysis 36598
2 analytes · Serum · Fasting not stated · Turnaround Set up: Sun-Thurs (p.m.); Report available: 5 days
Method and collection
Method
Equilibrium Dialysis by RIA • Immunochemiluminescence
Quest Diagnostics catalog page

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Sources

Labcorp test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
MedlinePlus, National Library of Medicine
The description at the top of this page.
LOINC 29239-1
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for T3, Free, Dialysis, LC/MS-MS
Registered studies that measure T3, Free, Dialysis, LC/MS-MS, on the U.S. National Library of Medicine registry.

Verify these ranges and sources

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.

Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.

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