The T4, Total (Total Thyroxine) test is a blood test used to measure the levels of thyroxine hormone in the body. Thyroxine is produced by the thyroid gland and is essential for regulating metabolism and energy levels. This test helps diagnose thyroid conditions such as hyperthyroidism or hypothyroidism, monitor thyroid hormone replacement therapy, and evaluate overall thyroid function. It provides valuable information to healthcare professionals in determining the cause of various symptoms related to thyroid dysfunction and guiding appropriate treatment plans.
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* Results are available same day by 9 p.m. 99% of the time. On rare occasions, it may take up to 3 business days to receive results.
T4, or thyroxine, is the primary thyroid hormone produced by the thyroid gland. While most T4 is bound to proteins, a small fraction remains unbound or free. Free T4 testing evaluates the circulating T4 that is accessible to body tissues and can exert its effects. Total T4 testing measures the overall amount of the hormone, encompassing both free T4 and the portion bound to proteins.
A T4 test may be requested by a doctor for various reasons, commonly as a follow-up to an abnormal TSH test result. It is also employed when there are symptoms suggestive of a thyroid disorder. Conditions like hypothyroidism and hyperthyroidism are prevalent, and if symptoms indicate these disorders, a doctor may order a T4 test along with other thyroid function tests, such as TSH and T3, forming a comprehensive thyroid panel.
Typically, no specific preparation is needed for a T4 test. Your doctor will inform you if there's a requirement to stop taking any medications or supplements before the test. In some cases, discontinuing Biotin (B7) supplements briefly may be necessary to avoid interference with the test results.
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What our customers say about us
Natalya Mitula
Very happy with my experience at Lilium, the testing process was extremely efficient and hassle free. I ran into an issue and customer service was incredible, truly a pleasure to see there are great companies like this one. Would work for them. And yes, great price, same day results at the advertised time by e-mail with a detailed report and an invoice. Truly impressed.
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Incredibly efficient. Very kind staff, our appointment was at 9:15 and by 9:17 we were in our car on our way back. The place is very clean, with proper seating (having a screen between every 4 seats). Amazing price in comparison to other places. 10/10 would recommend!
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