I am 25 weeks pregnant with twins and have Hashimotos, which has been untreated due to thyroid levels in the normal range for years. My OB referred me to an Endo because my most recent labs showed low levels for TSH & Free T4, as follows:
TSH - 0.037 (reference range .4 - 4.5)
Free, serum, T4 - 0.69 (Reference range 0.82 - 1.77)
Free, Serum T3 - 2.3 (reference range 2.0 - 4.4)
I am very worried since untreated hypothyroidism can cause cognitive problems in the unborn babies. The endo looked at my labs and said that Free T4 levels are not that accurate during pregnancy and diagnosed me as hyperthyroid and said I didn't need any medication. She drew more blood, however my next appointment isn't for 1 month since she is going on vacation. Every site that I have go to online says that low TSH and low T4 could indicate secondary hypothyroidism, not hyperthyroidism. I have some symptoms of being hypothyroid, such as feeling cold, and I also had lost a lot of hair prior to getting pregnant. I am wondering why the endo didn't even consider secondary hypothyroidism caused by the pituitary or hypothalmus when she was diagnosing me. What labs test are used to diagnose secondary hypothyroidism? Can I really be hyperthroid just due to the low TSH level?
I am confused and would love any help you can give.
Thanks!