Free Thyroxine T4 Test. Total t4 testing measures the total amount of t4, including free. This test is more accurate than the total t4 test (a test used to check levels of both free and bound t4 levels).
When should i take a free thyroxine test? Free thyroxine is a better indicator than total t4 in that it is not affected by levels of t4 binding proteins. Free thyroxine, free t4, total t4.
T4 and t3 sample is stable for 7 to 14 days at room temperature (37 °c) or at 2 to 8 °c.
A high level of tsh and a low level of t4 in the blood could mean you have an underactive thyroid. A healthcare provider may also recommend a. This test is more accurate than the total t4 test (a test used to check levels of both free and bound t4 levels). Free thyroxine is a better indicator than total t4 in that it is not affected by levels of t4 binding proteins.
