Full formMedical & Health
FT4stands forFree Thyroxine
Full Form of FT4
What is FT4?
FT4, or Free Thyroxine, is a blood test that measures the amount of thyroxine (T4) hormone not bound to proteins in the bloodstream. It is a key component of thyroid function testing, used alongside TSH (thyroid-stimulating hormone) and T3 (triiodothyronine) to diagnose and monitor thyroid disorders such as hypothyroidism, hyperthyroidism, and goiter. In India, FT4 testing is commonly prescribed by endocrinologists, general practitioners, and during routine health check-ups, especially in regions with high iodine deficiency prevalence. The test helps evaluate the active thyroid hormone available to tissues, providing a clearer picture of thyroid health than total T4 measurements. For students preparing for NEET PG, AIIMS, and other medical entrance exams, understanding FT4's role in feedback loops and clinical correlations is crucial. FT4 results are reported in ng/dL and vary by age, pregnancy, and medication use. It is a reliable marker for thyroid function and is often included in thyroid panels in Indian diagnostic labs.
FT4 का फुल फॉर्म
मुक्त थायरोक्सिन
Example
The endocrinologist reviewed the patient's TSH and FT4 levels to adjust the levothyroxine dosage for better management of hypothyroidism.
FT4 — frequently asked questions
What is the full form of FT4?
FT4 stands for Free Thyroxine, which refers to the unbound fraction of the thyroid hormone T4 circulating in the blood.
What is the normal range of FT4 in India?
The normal range of FT4 in adults is typically between 0.8 and 1.8 ng/dL, though reference values may vary slightly between Indian laboratories.
What is the difference between FT4 and total T4?
FT4 measures the free, active portion of thyroxine not attached to binding proteins, while total T4 includes both bound and free forms. FT4 provides a more accurate assessment of thyroid function.