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T3 Uptake
Test Code861
CPT Codes
84479
Preferred Specimen
1 mL serum collected in a serum separator tube (SST®)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Plasma collected in: Sodium heparin (green-top) or lithium heparin (green-top) tube
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 10 days
Frozen: 28 days
Refrigerated: 10 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Red-top tube (no gel)
Methodology
Immunoassay (IA)
Setup Schedule
Set up: Mon-Sat; Report available: 1-2 days
Clinical Significance
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.
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.