I found the section below on oestrogen and t4/t3 absorbtion on the TUK website.
I have been taking HRT for 4 months for postmenopausal OA, have done usual blood tests and upped my t3 dose back towards optimal levels free t3, but still feel not right.
The TUK piece suggests that tests might look like taking enough t3 but it is not being absorbed. But talks about doing more testing of TSH which is obvs pointless.
Any suggestions on getting t3 dose right on hrt if absorption can be a problem?
TUK excerpt:
"Oestrogen (in the contraceptive pill and HRT), provides more of the transport protein making the hormone inactive. Any oestrogen raises the levels although thyroid activity is unchanged. This could make your levels look within the normal range, whereas they are really below it. After starting on any oestrogen therapy, a woman should always have TSH tested to see if the oestrogen is having an impact on overall TSH and thyroid function and may require a dosage adjustment"