Free thyroxine also referred to as T4 . It works to speed up the metabolism and is one of the two

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We have a wide range of tests to cover your health needs. Order with next day delivery and avoid sitting in a doctor's office or clinic. Use our quiz to find the right test for you.
Pick your home test
We have a wide range of tests to cover your health needs. Order with next day delivery and avoid sitting in a doctor's office or clinic. Use our quiz to find the right test for you.
Pick your home test
We have a wide range of tests to cover your health needs. Order with next day delivery and avoid sitting in a doctor's office or clinic. Use our quiz to find the right test for you.