Thyroid hormone uptake
Indirectly measures thyroid hormone levels by assessing protein binding capacity in blood.
Why This Biomarker Matters
While less commonly used today, abnormal T-uptake may suggest thyroid dysfunction when interpreted with other tests. Modern thyroid assessment typically relies on TSH and free T4 for better accuracy.
Overview
Thyroid hormone uptake, also called T-uptake or resin uptake, is an older thyroid function test measuring thyroid hormone binding capacity in blood. It indirectly assesses thyroid hormone levels and is often used in combination with total T4 to calculate free T4 estimates. This test is less commonly used today, having been largely replaced by direct free T4 and TSH measurements. When ordered, abnormal results may indicate thyroid disorder, but interpretation requires clinical context and additional testing.
Technical Information (LOINC Codes)
Standardized laboratory codes for this biomarker
74793-1PrimaryAvailable Lab Tests
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