Thyroid Profile II, Comprehensive

CPT: 84436; 84443; 84479; 84480
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  • Thyroid Profile D (Comprehensive)

Test Includes

Free thyroxine index (FTI); T3 uptake (THBR); thyroid-stimulating hormone (TSH); thyroxine (T4); tri-iodothyronine (T3)

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




2.5 mL

Minimum Volume

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


Red-top tube or gel-barrier tube


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

Storage Instructions


Stability Requirements



Room temperature

14 days


14 days


14 days

Freeze/thaw cycles

Stable x3

Causes for Rejection

Plasma specimen

Test Details


See individual tests.


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
027011 Thyroid Profile II 004264 TSH uIU/mL 11580-8
027011 Thyroid Profile II 001149 Thyroxine (T4) ug/dL 3026-2
027011 Thyroid Profile II 001156 T3 Uptake % 3050-2
027011 Thyroid Profile II 001164 Free Thyroxine Index 32215-6
027011 Thyroid Profile II 002188 Triiodothyronine (T3) ng/dL 3053-6

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