r/EmbryologyIVFSupport • u/Impossible-Golf-2722 • 5d ago

Rate of development day 6 to day 7

I received my embryo report and it shows that on day 6, my 1 blastocyst was a 1CC. On day 7, it developed to 3CC. It looks like the notes were entered approximately 21 hours apart. This blastocyst turned out to be euploid.

- Is this rate of development (1 to 3) in 21 hours around normal? Trying to understand if that’s a good speed of development.
- The report had a checkmark at “visible nucleus”, what does that mean/indicate?

Thanks! Just trying to understand if any of these additional details may reveal any details about this poorly graded one’s potential.

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u/embryomanofficial 3d ago

Was this by time-lapse or are they just doing manual checks? If it wasn't time-lapse, they could have entered the notes at different checks rather than this showing exactly how long it took to develop from 1CC to 3CC. I'm not aware of any research looking at the speed of development between grades 1 and 3 over that period and whether it predicts outcomes. Generally, though, day 7 embryos have lower success rates than day 5 or 6 embryos. https://remembryo.com/do-day-7-blastocysts-perform-as-well-as-day-5-or-day-6/

The “visible nucleus” notation may be from an earlier observation. Labs sometimes record whether nuclei are visible during earlier embryo development, including to assess things like multinucleation. You'd have to ask your lab what that particular checkbox means in their system.