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Does norethindrone suppress FSH, LH completely?
If not, what can be possible causes for a postmenopausal woman to have FSH, LH < 0.3 with low E2, and being asymptomatic and doing well otherwise? (Norethindrone is for endometriosis.) Thank you!
Answer from: at Community Practice
I don't think progesterone alone would suppress LH and FSH completely so other pituitary hormones should be checked and if low, check MRI of sella. Also check for other exogenous hormone use/OTC supplements.
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Answer from: at Academic Institution
Agree, and also remember to check for biotin-containing supplements that can lead to falsely decreased FSH/LH.