Most orders within the UK are dispatched by Royal Mail Monday to Friday for orders placed before 16:00. We use Royal Mail’s Next-Day delivery service, and tracking information will be sent to you via email. Your order will typically arrive the day after dispatch. To ensure timely receipt, we recommend ordering your test kits well in advance of when you need to take your sample.
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Free thyroxine, also known as T4, is one of the two hormones produced by the thyroid gland and plays a key role in speeding up metabolism. This test specifically measures free T4, which refers to the unbound form of the hormone in the body. An issue arises only when there is an excess of unbound T4.
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