Endometrium (uterine lining)
The endometrium is the lining of the uterus where an embryo implants. Clinics check its thickness on ultrasound before an embryo transfer, as a receptive lining supports implantation.
The endometrium is the lining of the uterus. It thickens through the cycle to prepare for an embryo to implant and grow.
Why clinics watch it
Before an embryo transfer, scans check that the lining has reached a suitable thickness and pattern, since a receptive lining supports implantation.
Sources and further reading
- Cochrane: Preparing the lining for frozen transfer (2025). The lining in transfer preparation.
Source links checked on 7 September 2026. This source check is separate from medical review.
Related
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