The endometrium is the inner lining of the uterus, which thickens each cycle under the influence of oestradiol and progesterone to prepare for possible implantation, then sheds as a period if pregnancy does not occur. Endometrial thickness, measured on ultrasound, is one factor clinics check before an embryo transfer, alongside its layered (trilaminar) appearance, as both are linked with better chances of implantation, though neither guarantees pregnancy. Conditions affecting the endometrium — such as chronic endometritis, endometrial polyps, adenomyosis or a persistently thin lining — can reduce implantation chances and may be investigated with hysteroscopy or biopsy if transfers have not succeeded.
Also known as: uterine lining, endometrial thickness, womb lining
Related India guides
Sources
- Indian Council of Medical Research (icmr.gov.in)
- Federation of Obstetric and Gynaecological Societies of India (fogsi.org)
Last reviewed: 9 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.