If you have hypothyroid symptoms, but your lab tests are normal, you may have one of these patterns. Read on for more details.
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4. Hypothyroidism Caused by Decreased TBG
This is the mirror image of the pattern above. When TBG levels are low, levels of free thyroid hormone will be high. You might think this would cause
hyperthyroid symptoms. But too much free thyroid hormone in the bloodstream causes the cells to develop resistance to it. So, even though there’s more than enough thyroid hormone, the cells can’t use it and you’ll have hypothyroid—not hyperthyroid—symptoms.
With this pattern, TSH and T4 will be normal. If tested, T3 will be
high, and T3 uptake and TBG will be
low.
Decreased TBG is caused by high testosterone levels. (
5) In women, it is commonly associated with
PCOS and insulin resistance. Reversing insulin resistance and restoring blood sugar balance is the key to treating this pattern.
Another reference:
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Defect #4 – Thyroid binding globulin (TBG)
If there is
not enough thyroid binding globulin, there can be too much free thyroid hormone available for cells. While this doesn’t sound like a problem, elevated free thyroid hormone shuts down receptor sites and can therefore cause hypothyroid symptoms, despite high free thyroid hormone levels. The most common cause of this is elevated testosterone in both men and women.
I was hoping you'd would know more about it and offer some insight. To an extent I was just touching on
@Fa Seeshus comment about hypothyroidism and prolactin and the idea that high testosterone levels can cause hypothyroidism which becomes a cascading effect and potentially prolactin and gyno issues.