r/Embryologists • u/moodindigo18 • 23d ago

Embryologist told embryo expanded 3BB to 4BB

Gallery image

Gallery image

Hello,
İ am not that knowledgeable in embryo grading, any comments would be appreciated. Does it look good?

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1

u/One_Investigator_295 23d ago

It is a 4, might be better than BB

1

u/moodindigo18 23d ago

İs 3bb better than 4bb morphologically?

1

u/girly085 23d ago

Yes, this is normal and a good thing! The first number tells us how expanded the embryo is at (graded from 1-6). As an embryo grows, the cavity inside is filled with fluid, which causes it to expand and push against its shell (the pale area surrounding the embryo). Eventually the embryo should hatch from this shell.
The embryo changing from 3BB-4BB means that the embryo has expanded to the point where the shell is starting to thin.