The Istanbul consensus workshop on embryo assessment: proceedings of an expert meeting

Hum Reprod. 2011 Jun;26(6):1270-83. doi: 10.1093/humrep/der037. Epub 2011 Apr 18.


Background: Many variations in oocyte and embryo grading make inter-laboratory comparisons extremely difficult. This paper reports the proceedings of an international consensus meeting on oocyte and embryo morphology assessment.

Methods: Background presentations about current practice were given.

Results: The expert panel developed a set of consensus points to define the minimum criteria for oocyte and embryo morphology assessment.

Conclusions: It is expected that the definition of common terminology and standardization of laboratory practice related to embryo morphology assessment will result in more effective comparisons of treatment outcomes. This document is intended to be referenced as a global consensus to allow standardized reporting of the minimum data set required for the accurate description of embryo development.

Publication types

  • Consensus Development Conference
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Blastomeres / cytology
  • Chromosome Aberrations
  • Cleavage Stage, Ovum / classification
  • Embryo, Mammalian / cytology*
  • Embryonic Development / physiology*
  • Humans
  • Oocyte Retrieval / standards*
  • Oocytes / classification
  • Oocytes / cytology*
  • Reproductive Techniques, Assisted / standards*
  • Terminology as Topic
  • Treatment Outcome