Update Type: Test Down or Delayed
Test Updated: 08/28/2024
Test Overview
Test Methodology

Equilibrium Dialysis/Tandem Mass Spectrometry (MS/MS)

Test Usage

Determining thyroid status of sick, hospitalized patients
Determining thyroid status of patients in whom abnormal binding proteins have been identified
Possibly useful in pediatric patients

Reference Range *

0.8-2.0 ng/dL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday, Wednesday, Thursday
Analytic Time

4 - 9 days

Soft Order Code
FRT4D
MiChart Code
FRT4D
Synonyms
    Laboratory
    Sendout
    Reference Laboratory
    Mayo FRT4D
    Section
    Special Testing
    Specimen Requirements
    Collection Instructions

    Collect specimen in a red top or SST tube. Spin and aliquot and sent to Specimen Processing refrigerated.

    Normal Volume
    2.6 mL serum
    Minimum Volume
    1.2 mL serum
    Storage Temperature
    Ambient and frozen also acceptable
    Additional Information

    Test performed by Mayo Clinic Laboratories

    Billing
    CPT Code
    84439
    Fee Code
    AA589
    NY State Approved
    No