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T3 Uptake
Test CodeT3UP
Alias/See Also
Resin Uptake,T 3 Index,T 3RU,T 3 Resin Uptake,T 3
(Triiodothyronine),Hanolsky Uptake Test,Triiodothyronine, Resin
Uptake (T 3)
LAB5862
CPT Codes
84479
Preferred Specimen
1 mL serum or Plasma
Minimum Volume
0.5 m
Other Acceptable Specimens
Plasma collected in: Sodium heparin (green-top) or lithium heparin (green-top) tube
Transport Container
Plastic screw-cap vial
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days Refrigerated: 10 days Frozen: 28
days
Methodology
Immunoassay (IA)
Setup Schedule
Sun-Fri a.m., nights
Sat a.m.
Report Available
Next day
Reference Range
22-35 %
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.
Performing Laboratory
Quest Diagnostics Nichols Institute 14225 Newbrook Drive Chantilly, VA 20153
Last Updated: February 17, 2023