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T3 Uptake


T3 Uptake – 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.

Synonyms: Resin Uptake, Triiodothyronine, Resin Uptake (T3), T3 Index, T3RU, T3 Resin Uptake, T3 (Triiodothyronine), Hanolsky Uptake Test, T-Uptake

Specimen Required

SST, Serum. Volume 1 (0.5) mL serum. Stability: Refrigerated – 4 Days, Frozen – 2 Months

CPT Code(s)