Table 1.

In-house embryo grading system

Grade 1	Clear cells with even shape and size. No fragmentation.
Grade 1-	Clear cells with even shape and size. <5% fragmentation.
Grade 2	Fairly clear cells with mostly even shape and size (<10% difference). Slight fragmentation. 6–10%
Grade 2-	Fairly clear cells with mostly even shape and size (<10% difference). Slight fragmentation. 10%–15%
Grade 3	Cells are unclear and uneven in shape. Considerable fragmentation 16–25%.
Grade 3-	Cells are unclear and uneven in shape. Considerable fragmentation 26–35%.
Grade 4	Undistinguishable cells with large amounts of fragmentation >35%