Thyroxine Antibody
Also known as: ANTI-T4
Use
The Thyroxine Antibody test is used to detect the presence of antibodies to thyroxine (T4), which can interfere with thyroid hormone assays and lead to incorrect diagnoses of thyroid dysfunction. This test is crucial for patients who are suspected of having antithyroid antibodies that may affect the results of thyroid function tests. Accurate evaluation is essential for the proper management of thyroid disorders, especially in cases where results are inconsistent with clinical findings.
Special Instructions
This test requires the collection of a plain red or serum separator tube (SST). It is important to note that the test is not performed at ARUP Laboratories, and separate specimens must be submitted when multiple tests are ordered. The specimen transport tube must be an ARUP standard.
Limitations
This assay has not been cleared or approved by the FDA. The performance characteristics of this test have been determined by Quest Diagnostics; it is used for clinical purposes following validation according to CLIA regulations. Factors such as hemolysis or lipemia in samples can lead to test rejection. As the test is performed by a non-ARUP laboratory, additional limitations such as methodological variations may apply.
New York Approved
Methodology
Immunoassay (RIA)
Biomarkers
LOINC Codes
- 38356-2
Result Turnaround Time
8-14 days
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
Collect using a plain red or serum separator tube (SST).
Storage Instructions
Frozen. Also acceptable: Room temperature or refrigerated.
Causes for Rejection
Glass containers. Grossly hemolyzed or lipemic specimens.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 2 weeks |
| Refrigerated | 2 weeks |
| Frozen | 28 days |
Other tests from different labs that may be relevant