Full formMedical & Health
T4stands forTetraiodothyronine (Thyroxine)
Full Form of T4
What is T4?
T4, also known as tetraiodothyronine or thyroxine, is one of the two primary hormones produced by the thyroid gland, the other being T3 (triiodothyronine). It plays a critical role in regulating the body's metabolism, heart rate, and overall growth and development. In India, thyroid disorders such as hypothyroidism and hyperthyroidism are highly prevalent, making T4 a common term in clinical settings and diagnostic labs. The T4 test is routinely ordered by physicians to evaluate thyroid function, often alongside TSH (thyroid-stimulating hormone) and T3 levels. T4 is also a key topic in biology textbooks for classes 11 and 12, as well as in competitive medical entrance exams like NEET and AIIMS. Understanding the synthesis, regulation, and action of T4 is essential for students pursuing careers in medicine, pharmacy, and life sciences. The hormone is produced in the thyroid follicles, converted to the more active T3 in peripheral tissues, and its secretion is controlled by the hypothalamic-pituitary-thyroid axis. Imbalances in T4 can lead to conditions such as goiter, weight fluctuations, fatigue, and cognitive impairment. Early detection through T4 screening is vital for effective management of thyroid diseases in the Indian population.
T4 का फुल फॉर्म
टेट्राआयोडोथायरोनिन (थायरॉक्सिन)
Example
The patient's TSH was elevated, so the doctor ordered a free T4 test to confirm the diagnosis of hypothyroidism.
T4 — frequently asked questions
What is the full form of T4?
The full form of T4 is Tetraiodothyronine, also commonly called thyroxine. It is a hormone produced by the thyroid gland.
What is the normal range of T4 in Indian adults?
The normal range for total T4 in Indian adults is typically between 4.5 and 12.5 mcg/dL, though reference values may vary slightly between laboratories. Free T4 (FT4) normal range is usually 0.8–1.8 ng/dL.
How is T4 different from T3?
T4 contains four iodine atoms and is the main storage form of thyroid hormone, while T3 has three iodine atoms and is the more active form. T4 is converted to T3 in tissues to exert its metabolic effects.