Hi Kiran,
Fertility clinics often grade embryos slightly differently but if a second letter wasn’t recorded and the embryos were created in the same clinic where you had your last transfer – then it might be worth checking with the clinic.
Embryos are usually graded in the following way:
Number – this is from 1-6 and looks at the expansion of the embryo’s cavity
First letter – A -D is the inner cell mass quality
Second letter – A – D the trophectoderm quality
Grading is only a snapshot of the embryo and i have seen embryos that were graded very low go on to achieve a healthy pregnancy – so it really is just a look down the microscope of what the embryo looks like.
I hope that helps,
Fran
