Total Ts and Estrogen Dominance

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This is the one that I was looking for. It explains how Total Ts are affected by estrogen dominance, and Free Ts are not. It's from http://www.drrind.com/thyroidscale.asp if you want to read more.

Total T4: Reflects the total amount of T4 present in the blood, i.e., the protein bound (unavailable) T4 and the Free T4. Note that high levels of estrogens (birth control pills, non-bio-identical hormone replacement, or pregnancy) or estrogen dominance can increase the amount of the protein that binds T4. This will produce misleading elevated Total T4 values which can look like ‘hyperthyroidism’ when it is not. Total T3: Reflects the total amount of T3 present in the blood, i.e., the protein bound (unavailable) T3 as well as the Free T3. Again, estrogen dominance creates the same effect as mentioned in relationship to T4 above. Free T4: Reflects the biologically active (free) form of T4. This T4 can be converted to T3 or RT3. This value is relatively stable and not influenced by estrogen dominance. Free T3: Reflects the biologically active (free) form of T3 that can generate production of energy (in the form of ATP). This value is relatively stable and not influenced by estrogen dominance.

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