Morphological classification of human in-vitro fertilization embryos based on the regularity of the asynchronous division process.

A previous study detailed the morphometric characteristics of living in-vitro fertilized human pronuclear zygotes and cleaved embryos. A comparison of the different embryo cell stages confirmed the asynchronous division process during early embryo development. Global results showed no evidence of morphometrical differences between embryo subpopulations according to their classical microscopical grading.