Thyroid Profile

CPT: 84436; 84479
Updated on 12/5/2018
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Test Details

Synonyms

  • '99 Thyroid Profile (Compliance)

Test Includes

Free thyroxine index; T3 uptake (THBR); thyroxine (T4)

Use

FTI is a physiologic index of metabolic activity that correlates with free thyroxine (T4)

Methodology

Electrochemiluminescence Immunoassay (ECLIA)

Cloned enzyme donor immunoassay (CEDIA)

Electrochemiluminescence Immunoassay (ECLIA)

Specimen Requirements

Specimen

Serum

Volume

1 mL

Minimum Volume

0.5 mL (Note: This volume does not allow for repeat testing.)

Container

Red-top tube or gel-barrier tube

Collection

If a red-top tube is used, transfer separated serum to a plastic transport tube.

Storage Instructions

Room temperature

Stability Requirements

Temperature

Period

Room temperature

14 days

Refrigerated

14 days

Frozen

14 days

Freeze/thaw cycles

Stable x3

Clinical Information

Special Instructions

This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
000455 Thyroid Panel 001149 Thyroxine (T4) ug/dL 3026-2
000455 Thyroid Panel 001156 T3 Uptake % 3050-2
000455 Thyroid Panel 001164 Free Thyroxine Index 32215-6

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CPT Statement/Profile Statement

The LOINC® codes are copyright © 1994-2018, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf