In order to find and pinpoint the implantation window, an endometrial biopsy was taken five days after ovulation in the midluteal phase in the natural cycle. The obtained results from histomorphological analyses, based on Noyes et al. Surprisingly, the results from the second biopsy performed one month later showed a typical WOI seven days after ovulation, which was in contradiction with the data from the first biopsy.

To confirm this, a third endometrial biopsy was carried out in the next cycle but it showed the displacement of the implantation window by two days nine days after ovulation.

The criteria for endometrial dating used by Hertig based on the standards then used at the Free Hospi- tal for Women, Brookline, Massachusetts, were reduced to.

Either your web browser doesn’t support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. Read article at publisher’s site DOI : Ritchie WG. Mori H. Turk J Obstet Gynecol , 13 3 , 15 Sep To arrive at the top five similar articles we use a word-weighted algorithm to compare words from the Title and Abstract of each citation. J Clin Endocrinol Metab , 69 4 , 01 Oct Cited by: 37 articles PMID: Fertil Steril , 82 5 , 01 Nov