A Free Thyroid Profile is a blood test that measures the levels of unbound (“free”) thyroid hormones in your blood.
It usually includes:
Free T3 (FT3) – Active thyroid hormone.
Free T4 (FT4) – Stored form, converted into T3 in the body.
TSH (Thyroid-Stimulating Hormone) – Produced by the pituitary gland to control thyroid hormone production.
Total T3/T4 includes hormones attached to proteins (inactive).
Free T3/T4 measures only the active form available to the body, making it more accurate in assessing thyroid function.
Doctors recommend a Free Thyroid Profile to:
Check for hypothyroidism (underactive thyroid).
Check for hyperthyroidism (overactive thyroid).
Monitor thyroid treatment.
Investigate symptoms such as fatigue, weight changes, hair loss, irregular heartbeat, mood changes.
