Diagnosis of endometrial receptivity (ER) has posed a challenge and so far, most available tests have been
subjective and lack accuracy and a predictive value. Microarray technology has allowed identification of the
transcriptomic signature of the window of receptivity window of implantation (WOI).
This technology has led to the development of a molecular diagnostic tool, the ER array (ERA) for diagnosis of ER.
Use of this test in patients with recurrent implantation failure (RIF) has shown that the WOI is displaced in a
quarter of these patients and use of a personalized embryo transfer (PET) on the day designated by ERA improves
Our results in the Indian population revealed an endometrial factor in 27.5% RIF patients, which was significantly
greater than the non-RIF group 15% (P = 0.04). After pET, the overall ongoing pregnancy rate was 42.4% and
implantation rate was 33%, which was at par with our in-vitro fertilization results over 1-year.
We also performed ERA in patients with persistently thin endometrium, and it was reassuring to find that the
endometrium in 75% of these patients was receptive despite being 6 mm or less. A pregnancy rate of 66.7% was
achieved in this group.
Though larger studies are required to validate these results ERA has become a useful tool in our diagnostic
armamentarium for ER.