Embryo Grades-Morphology
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Grade 1: Symmetrical blastomeres, no fragments Correct stage of development. |
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Grade 2: Slight asymmetrical blastomeres, < 10% fragmentation. Correct stage of development.
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Grade 3: Asymmetrical blastomeres and or up to 30% fragmentation. Slow development |
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Grade 4: Grossly asymmetrical blastomeres and or >30% fragmentation. Developmental arrest PN stage |
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Grade 5: Degenerate embryo-100% fragmentation or atrophic embryo |
