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Thyroxine (T4) is a hormone, secreted by the thyroid gland (a small, butterfly-shaped gland located in front of the neck). The T4 hormone is essential for growth and metabolism. T4 circulates in the blood in two forms: free form (FT4) and bound form. Free Thyroxine (T4) Test measures the free form of thyroxine hormone in the blood. The human body is an ever-growing organism, and to grow, it needs energy. The energy is extracted or produced from enzymes that bond with a hormone produced by the thyroid gland, called T4. An excess of anything is always harmful to the human body. Similarly, with T4, an abnormally high amount of Free T4 can cause severe health issues. Elevated Free T4 levels may also suggest possibilities of Thyroiditis or Toxic Multinodular Goitre. The Free T4 test, formally known as Free Thyroxine Test, is recommended by doctors to accurately measure the amount of T4 hormones not being bound with blood tissues. The laboratory test is essential for the official diagnosis of Thyroiditis and measures Free T4 (FT4) or Free T4 Index (FTI). A regular Free T4 blood test can be recommended based on some studies proving that ignored, elevated measures of Free T4 can mean an increased risk of solid cancers such as lung cancer, breast cancer, and prostate cancer. Hypothyroidism is a disease wherein the thyroid gland releases excess T4 hormones, which slows down metabolism, causing problems like weight gain, uneasiness, and low tolerance to cold temperatures. You can also make Free T4 Tests a part of your health check-up if you start to feel a sudden weight change, fatigue, or anxiety. Also, check for other symptoms like dry skin, hair loss, and hand tremors. If the results of the Free T4 Test are abnormal, consult your doctor. Thyroid-related problems are on the rise in India, where 1 in every 10 Indians have hyperthyroidism. The cause can vary from a deficiency of iodine to contaminated water and environmental factors. While the common belief is that obesity and heart problems are inherited from predecessors, the fact is the typical Indian diet and a lack of exercise can be the causative factors here. With proper diet and regular exercise, thyroid disorders can be avoided to a major extent.


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