Test Directory

Free T3

Loinc

Expected Turnaround

24 hours

Information

Free T3 is a useful tool in clinical routine diagnostics for the assessment of the thyroid status. Free T3 measurements support the differential diagnosis of thyroid disorders, are needed to distinguish different forms of hyperthyroidism, and to identify patients with T3 thyrotoxicosis.

Collection Information

Methodology

Electrochemiluminescence-immunoassay (ECLIA)

Limitations

In rare cases, interference due to extremely high titers of antibodies to analyte‑specific antibodies, streptavidin or ruthenium can occur. These effects are minimized by suitable test design.

Rejection Criteria

Specimen Stability

Room Temperature: 5 days Refrigerated: 7 days Frozen: 1 month

Alias

Free T3; T3, free

Container Type

Serum, gel separator, SST

Minimum Volume

1 ML

Age Range

0 - 999

Sex

Generic

Units of Measure

Reference Range

2 - 4.4

Panic Range