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
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