T3 UPTAKE (REFL)

Clinical Significance
T3 Uptake (REFL) - Decreased: Pregnancy, estrogens, hyperproteinemia, acute intermittent porphyria.
Increased: Androgens, hyperproteinemia, stress, acute liver disease.
This assay is a measure of available thyroid hormone binding sites and should be interpreted with thyroxine levels.

Preferred Specimen(s)
1 mL serum

Alternative Specimen(s)
Plasma collected in: Sodium heparin (green-top) tube or lithium heparin (green-top) tube

Minimum Volume
0.5 mL

Transport Container
Serum separator tube (SST)

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 7 days
Refrigerated: 10 days
Frozen: 28 days
Setup Schedule

Includes
This is a client specific reflex test. Reflex criteria has been pre-defined by the ordering physician. Additional testing will be performed at an additional charge.

Methodology
Immunoassay (IA)

Reference Range(s)
22-35 %