Perfect lining: I assume you will start Progesterone replacement soon as part of your protocol before your fet. Once Progesterone begins you will not see much growth (and possibly some thining) of the endometrial lining. Ideally you want the lining above 8 mm and triple line in appearance before start of the progesterone. There is no hard data on maximum thickness but some feel its around 18 mm.
Answered 5/24/2018
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