@foodiefil your embryos will be graded by the embryologist, my clinic uses a number grading system, you get two numbers per embryo- 1 is the best, followed by 2 and then 3. So 1,1 is the best grading. Generally anything with a 3 in, may be viable but may not be deemed freezable.
The embryos also have a stage of development- so they will be expanding and then expanded and then hatching and then hatched. The further along this progress, the better.
My embryos were in an embryoscope, so I have got a number out of 10, that is the caremaps score- 10/10 is the best.
So the embryo that I’ve had transferred is the best that you can get- 1,1, fully hatched and 10/10. But, this grading does not tell you if there is aneuploidy present (this is where there are slightly more or less chromosomes than expected- these tend not to implant or result in miscarriage or result in a condition like Down’s syndrome). The grading also doesn’t tell you about abnormalities within the chromosomes like mutations that can also result in an unsuccessful transfer.
Some clinics use the number grading system, others use letters. You’ll only find out the final grading at day 5. You should ask if your embryos are in an embryoscope as this provides more information.