T3 Uptake

T3 Uptake (also called T3 Resin Uptake or T3RU) is an indirect measure of thyroid hormone binding capacity. It helps estimate free thyroxine index when combined with total T4.

Category: Thyroid Panel

Also known as: t3 uptake

Reference range: 24–39 % (Source: ABIM)

Standard unit: %

High values may indicate

High T3 uptake may indicate hyperthyroidism or decreased thyroid-binding globulin.

Low values may indicate

Low T3 uptake may indicate hypothyroidism or increased thyroid-binding globulin (e.g., during pregnancy).

Source: BloodId admin-reviewed

Track your T3 Uptake over time with BloodId