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Thyroxine (T4) Free Blood Test, Dialysis

Thyroxine (T4) free blood test, dialysis is used to assess Free T4 which may be indicated when binding globulin (TBG) problems are perceived, or when conventional test results seem inconsistent with clinical observations.

Sample Report

Test Code: 501902

CPT Code: 84439

Also Known As: Free Thyroxine (T4) by Dialysis/Mass Spectrometry; FT4

Methodology:

Direct dialysis mass spectrometry; high-pressure liquid chromatography/mass spectrometry (HPLC/MS)

Preparation:

No special preparation required.

Test Results:

7-9 days. May take longer based on weather, holiday or lab delays.

Details:

This test measures Free T4 levels using the Direct Dialysis and High-Pressure Liquid Chromatography/Mass Spectrometry (LC/MS-MS) methodologies.

Sample Report

Test Code: 35167

CPT Code: 84439

Also Known As: Free Thyroxine (T4) by Dialysis/Mass Spectrometry; FT4

Methodology:

Equilibrium Dialysis • Chromatography/Mass Spectrometry

Preparation:

No special preparation required.

Test Results:

7-10 days. May take longer based on weather, holiday or lab delays.

Details:

This test measures Free T4 levels using the Equilibrium Dialysis and Chromatography/Mass Spectrometry methodologies.

 

Description

Free T4 may be indicated when binding globulin (TBG) problems are perceived, or when conventional test results seem inconsistent with clinical observations. It is normal in subjects with high thyroxine-binding globulin hormone binding who are euthyroid (ie, free thyroxine should be normal in nonthyroidal diseases). It should be normal in familial dysalbuminemic hyperthyroxinemia.

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