Hi, I have this question and looked everywhere on net for a grading system which gives a blastocyst 1 as being the top but it also has letters like gardner system as aa, ab, bb, etc.
Ours were graded as 1ab, 2bb for first cycle and second cycle only one blastocyst with 2bb grading.
I was upset until I found through nurse that these are good embryos. They only said 1 & 2 are really good with 1 being the top.
So I believe aa, ab,bb ..etc. Should mean similar to garner grading and also read thT so many clinics use 1 for top quality embryo for day 3 in terms of fragmentation and 1 means no fragmentation.
But cannot figure out what the combination might mean and why they may use day 3 grading for day 5 blastocysts?!!
Anyone having similar experience or know what type of naming is this?