Obgyn Key

28-BV-1 Early blastocyst 28-AW-1 Early blastocyst

27-BV-1 Expanded blastocyst with cytoplasmic strings out of focus 27-AW-1 Expanded blastocyst with moderate cytoplasmic granulation

26-BV-1 Full blastocyst 26-AW-1 Full blastocyst showing immediate re-expansion

24-BV-1 Beginning morula 24-AW-1 Warmed morula with signs of degeneration (extensive granulation, almost no membranes visible)

25-BV-1 Hatching blastocyst that collapsed during hatching process (hatching site at 11 o’clock position) 25-AW-1 Partly re-expanded blastocyst

23-BV-1 Early blastocyst 23-AW-1a Viable early blastocyst

21-BV-1 Expanded blastocyst 21-AW-1a Non re-expanded blastocyst with moderate cytoplasmic granulation

22-BV-1 Blastocyst (4ab) showing beginning of expansion

20-BV-1 Expanded blastocyst hatching from the embryonic pole

19-BV-1 Early blastocyst with blastocoel formation at the 2 o’clock position