Free Thyroxine Index Panel
Also known as: FTIP
Use
The Free Thyroxine Index Panel is used to determine the level of free thyroxine in the blood, which is a crucial thyroid hormone affecting metabolism and overall health. This test is not recommended for routine thyroid disorder screening; instead, the Thyroid Stimulating Hormone test is suggested for initial screening. It includes measurements of Thyroxine, Total (T4) and T Uptake to provide a calculated Free Thyroxine Index, helping in the assessment of thyroid function.
Special Instructions
Not provided.
Limitations
The test may not provide a comprehensive evaluation for thyroid disorder and should not be used as a standalone test for diagnosis. It is important to consider alternative tests that may provide a more direct measurement of thyroid function, such as the Thyroid Stimulating Hormone test. Also, grossly hemolyzed specimens are unacceptable for testing.
FDA ApprovedNew York Approved
Methodology
Immunoassay (ECLIA)
Biomarkers
LOINC Codes
- 3026-2 - T4 SerPl-mCnc
- 32215-6 - FT4I SerPl Calc-mCnc
- 74795-6 - Total TBC SerPl
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL
Minimum Volume
0.5 mL
Container
ARUP Standard Transport Tube
Collection Instructions
Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection.
Causes for Rejection
Grossly hemolyzed specimens
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 4 days |
| Refrigerated | 8 days |
| Frozen | 1 year |
Other tests from different labs that may be relevant