T3 Uptake

Specialist

also thbr

What it isA legacy test that indirectly measures available thyroid-binding protein capacity by competing radiolabeled T3 against the patient's own thyroid hormones.

DoesProvides one of the inputs into the legacy Free T4 Index calculation.

GoodA mid-range value with normal Free T4 indicates balanced transport protein levels.

BadLargely superseded by direct Free T4 measurement.

Standard

22–35%.

Optimal

26–32% (narrow target)

Modifiers

Estrogen, pregnancy, and liver disease shift binding proteins.

How to optimize

Lifestyle: —
Diet: —
Supplements: —
Peptides: —
Drugs: —

within Thyroid