Ordering Recommendation

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
Collect

Plain red or lavender (K2EDTA). Also acceptable:  Serum separator tube (SST), lavender (K3EDTA), pink (K2EDTA), plasma preparation tube (PPT) or green (sodium heparin).

Specimen Preparation

Separate from cells ASAP or within 45 minutes of collection. Transfer 1 mL serum or plasma to an ARUP standard transport tube. (Min: 0.3 mL)
Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.

Storage/Transport Temperature

Frozen. Also acceptable: Refrigerated or room temperature.

Unacceptable Conditions

Specimen submitted in gel-barrier tube.

Remarks
Stability

Ambient: 5 days; Refrigerated: 5 days; Frozen: 10 weeks

Methodology

Quantitative Equilibrium Dialysis (ED)/High Performance Liquid Chromatography-Tandem Mass Spectrometry

Performed

Varies

Reported

8-14 days

Reference Interval

By report

Interpretive Data



Compliance Category

Performed by non-ARUP Laboratory

Note

Hotline History

N/A

CPT Codes

84481

Components

Component Test Code* Component Chart Name LOINC
2011794 Free Triiodothyronine, Dialysis/LC-MS/MS 29239-1
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Triiodothyronine, Free (FT3)
Triiodothyronine (T3), Free by Equilibrium Dialysis/LC-MS/MS

Esoterix Endocrinology