T4 Test | What is a T4 Test (thyroid disease)?

 What is a T4 test? A thyroxine (T4) lab test is used to check for thyroid problems, such as hyperthyroidism or hypothyroidism. T4 is the primary hormone produced by your thyroid, and plays a critical role in many of your body’s functions – such as hormone balance, metabolism, internal thermostat, and growth....

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