1. Morphological embryo assessment: reevaluation
Haggai Bar-Yoseph, B.Sc., Amalia Levy, Ph.D., Yael Sonin, M.Sc., Sarit Alboteanu, M.Sc., Eliahu Levitas, M.D., Eitan Lunenfeld, M.D., Iris Har-Vardi, Ph.D. 
Fertility and Sterility 
Volume 95, Issue 5, Pages e2 (April 2011)
DOI: /j.fertnstert
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
The nuclear scoring: grade 1n, ≥75% of blastomeres with one nucleus; grade p1n, <75% of blastomeres with one nucleus; grade NV, no visible nuclei; grade MN, >1 nuclei in one blastomere.
Fertility and Sterility  , e2DOI: ( /j.fertnstert )
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
(A) Pronuclear scoring and implantation rates: grade Z1 versus grade Z2, P=.87; grade Z3 versus grades Z1 and Z2, P=.036; grade Z4 versus grades Z1–Z3, P=.046. (B) Nuclear scoring and implantation rate. P<.001. (C) Embryo morphology scoring on day 2 and implantation rate. P<.001.
Fertility and Sterility  , e2DOI: ( /j.fertnstert )
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

4. Embryo morphological scoring (IDX): grade IDX1, symmetrical blastomeres with no fragments; IDX2, asymmetrical blastomeres with no fragments; IDX3, symmetrical blastomeres with ≤30% fragmentation; IDX4, asymmetrical blastomeres with ≤30% fragmentation; IDX5, >50% fragmentation.
Fertility and Sterility  , e2DOI: ( /j.fertnstert )
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions