Thyroid Profile

CPT: 84436; 84479
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Synonyms

  • '99 Thyroid Profile (Compliance)

Test Includes

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


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.


Expected Turnaround Time

Within 1 day


Related Documents


Specimen Requirements


Specimen

Serum (preferred) or plasma


Volume

1 mL


Minimum Volume

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


Container

Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma.


Collection

If a red-top tube or plasma is used, transfer separated serum or plasma 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


Test Details


Use

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


Methodology

Electrochemiluminescence Immunoassay (ECLIA)


LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
000455 Thyroid Panel 90224-7 001149 Thyroxine (T4) ug/dL 3026-2
000455 Thyroid Panel 90224-7 001156 T3 Uptake % 3050-2
000455 Thyroid Panel 90224-7 001164 Free Thyroxine Index 32215-6

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