Biomarkers · Chemical
Free T4 by Dialysis/Mass Spec
Thyroxine is also called T4. T4 is a hormone that your thyroid gland makes.
Thyroxine (T4) Test, MedlinePlus, National Library of Medicine
- Primary unit
- ng/dL
- LOINC codes
- 6892-4
- Tests that measure Free T4 by Dialysis/Mass Spec
- Quest Diagnostics 2, Labcorp 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, T4 Free, Direct Dialysis 35167
| Population | Interval |
|---|---|
| Adult | 0.9-2.2 ng/dL |
| Prematures, 25-30 Weeks | Not stated |
| Birth-7 Days | 0.5-3.3 ng/dL |
| Prematures, 31-36 Weeks | Not stated |
| 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 | Not stated |
| First Trimester | 0.9-2.0 ng/dL |
| Second Trimester | 0.8-1.5 ng/dL |
| Third Trimester | 0.8-1.7 ng/dL |
Tests
Check the catalog code, specimen, method and preparation for every test that measures Free T4 by Dialysis/Mass Spec. Select up to five tests to compare them side by side.
Quest Diagnostics 2 tests
Single-analyte tests
T4 Free, Direct Dialysis 35167
Serum · Fasting not stated · Turnaround Set up: Mon-Thurs; Report available: 5 days
Quest Diagnostics catalog pageMethod and collection
- Method
- Equilibrium Dialysis • Chromatography/Mass Spectrometry
- Preparation
- Fasting preferred
- Collection
- Please specify the patient's age on the request form
Panels that include this biomarker
T4 Free, Direct Dialysis and T4 Total 36725
2 analytes · Serum · Fasting not stated
Quest Diagnostics catalog pageMethod 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
Labcorp 1 test
Single-analyte tests
Thyroxine (T4), Free, Dialysis/Mass Spectrometry (Endocrine Sciences) 501902
Serum · Fasting not stated · Turnaround 6 - 11 days
Labcorp catalog pageMethod and collection
- Method
- Direct dialysis mass spectrometry; high-pressure liquid chromatography/mass spectrometry (HPLC/MS)
- Collection
- Serum or plasma must be separated from cells within 45 minutes of venipuncture. Send serum or plasma in plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested .
- Reference notes
- See table. Age | Range (ng/dL) Premature (0 to 4 wk) | 0.86−4.46 Newborn 0 to 2 wk | 0.84−4.97 2 wk to 12 m | 0.81−2.12 Children 1 to 11 y | 0.65−1.9 Pubertal children and adults | 0.8−1.7 Pregnant female first trimester (0 to 13.3 wk) | 0.65−1.4 second trimester (13.4 to 26.6 wk) | 0.5−1.3 third trimester (>26.6 wk) | 0.5−1.1
0 of 5 tests selected
Pick one moreSources
1 test: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
2 tests: codes, specimens, methods, preparation and reference intervals.
MedlinePlus, National Library of Medicine
The description at the top of this page.
LOINC 6892-4
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for Free T4 by Dialysis/Mass Spec
Registered studies that measure Free T4 by Dialysis/Mass Spec, 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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