Thin endometrial lining - this is also uncommon. We like to see a lining of at least 8mm in thickness when measured by ultrasound at the time of maximal thickness during the cycle (see above ultrasound picture of an 11.2 mm lining). There is some ongoing debate as to "how thin is too thin", as well as to "how thick is too thick". In general, 8-13 mm is good, less than 6 is potentially a problem, and greater than 15 or so might possibly reduce chances for a successful pregnancy. During IVF treatment, the uterine lining starts at about 3mm thick at the end of the menstrual period. After the estrogen levels rise sufficiently, the lining of the uterus then thickens by about 1mm each day during IVF.
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