Verywell Health on MSN1y
What Is T4? Thyroxine Test and What It MeansEun Lee, MD If your healthcare provider has ordered a T4 test, you may wonder what it is. Thyroxine is another name for T4, ...
your doctor will then evaluate your levels of T4 and T3 to see if they’re within the normal ranges. In order to perform these tests, your doctor will need to take a sample of blood from your arm.
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