If you suspect you have a low thyroid it is best to discuss comprehensive testing with your healthcare practitioner. This includes measuring thyroid stimulating hormone (TSH), free T4, free T3 and reverse T3. This will give you an idea of how well your thyroid hormones are actually functioning.
Most doctors only test (TSH) levels due to restraints within the current medical model.
You may be told that your thyroid function is normal when TSH levels are within an acceptable range. However 'normal' TSH levels do not automatically rule out a hypothyroid condition.
A single TSH test does not reveal how much T4 and T3 is being produced.
In addition, it does not assess how well T4 is converting to the active T3 form. In fact conversion may be very inefficient and a large amount of T4 may be converting to the inactive form of T3 called reverse T3 (rT3).
A specific reverse T3 test is the only way to identify high levels of this inactive form of T3. Under normal conditions T4 will convert to both T3 and rT3 and the body quickly eliminates rT3.
When too much T4 converts through to rT3 it leads to the common symptoms of hypothyroidism. A measurement of rT3 is valuable in identifying a thyroid disorder called 'reverse T3 dominance'.
Reverse T3 Warning
Diagnosing Low Thyroid Function
Reverse T3 Dominance Treatment
Thyroid Gland Function
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