Free T4 Index (T7) details
What Free T4 Index (T7) shows
The Free Thyroxine Index (FTI) is a calculated value, derived from total T4 and a related binding-capacity test (T3 uptake), designed to estimate your free (unbound, active) T4 level without measuring it directly. It was more commonly used before direct free T4 assays became widely available and reliable; today, most labs simply measure free T4 directly, making FTI a somewhat older approach still occasionally used or reported in certain settings, serving the same basic purpose as a direct free T4 result.
Tests that include Free T4 Index (T7)
For diagnosis of hypothyroidism and hyperthyroidism.
- T3 Uptake An older test used, together with total T4, to estimate free thyroid hormone levels by assessing binding protein capacity.
- T4, Total Measures total thyroxine (T4), including both bound and unbound hormone, used in thyroid function evaluation.
- Free T4 Index (T7) Free Thyroxine Index — a calculated estimate of free T4 thyroid hormone, adjusting total T4 for binding protein levels.
The Thyroid Panel assesses 4 key markers related to thyroid function. It helps evaluate overall thyroid health and is commonly used to diagnose conditions like hypothyroidism, hyperthyroidism, and monitor thyroid therapy.
- T3 Uptake An older test used, together with total T4, to estimate free thyroid hormone levels by assessing binding protein capacity.
- T4, Total Measures total thyroxine (T4), including both bound and unbound hormone, used in thyroid function evaluation.
- Thyroid-Stimulating Hormone (TSH) A pituitary hormone that signals your thyroid to produce hormone. The primary screening test for both underactive and overactive thyroid conditions.
- Free T4 Index (T7) Free Thyroxine Index — a calculated estimate of free T4 thyroid hormone, adjusting total T4 for binding protein levels.
The Thyroid Panel assesses 4 key markers related to thyroid function. It helps evaluate overall thyroid health and is commonly used to diagnose conditions like hypothyroidism, hyperthyroidism, and monitor thyroid therapy.
- T3 Uptake An older test used, together with total T4, to estimate free thyroid hormone levels by assessing binding protein capacity.
- T4, Total Measures total thyroxine (T4), including both bound and unbound hormone, used in thyroid function evaluation.
- Thyroid-Stimulating Hormone (TSH) A pituitary hormone that signals your thyroid to produce hormone. The primary screening test for both underactive and overactive thyroid conditions.
- Free T4 Index (T7) Free Thyroxine Index — a calculated estimate of free T4 thyroid hormone, adjusting total T4 for binding protein levels.
This test is crucial for diagnosing thyroid conditions such as hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid). By measuring the total level of thyroxine (T4) in the blood, it helps in understanding thyroid function and identifying potential issues.
- T4, Total Measures total thyroxine (T4), including both bound and unbound hormone, used in thyroid function evaluation.
- Free T4 Index (T7) Free Thyroxine Index — a calculated estimate of free T4 thyroid hormone, adjusting total T4 for binding protein levels.
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