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Embryo scoring based on blastocyst expansion grade according to Gardner et al. (36)
| Expansion grade | Description |
|---|---|
| 1 | Blastocyst development and stage status |
| 2 | Blastocoel cavity more than half the volume of the embryo |
| 3 | Full blastocyst, cavity completely filling the embryo |
| 4 | Expanded blastocyst, cavity larger than the embryo, with thinning of the shell |
| 5 | Hatching out of the shell |
| 6 | Hatched out of the shell |
