Endometrial Thickness

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated April 18, 2026

The measurement of the uterine lining as assessed by transvaginal ultrasound. Optimal endometrial thickness for implantation is generally 7 to 8 mm or more with a trilaminar (three-layer) pattern. Thin endometrium is associated with reduced implantation rates and is investigated for causes including prior uterine surgery, estrogen deficiency, poor blood flow, and Asherman's syndrome.

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