Dear Syeda,
We have done an IVF with PGD 2 years back and we have got a matching sibling (9 months old now) for my Thal kid (5 years old), we are planning for a BMT currently.
On the PGD they asked us to check with our doctor on which allele they should match and our doctor advised on the following:
HLA-A, HLA-B, HLA-C, HLA-DRB1, HLA-DQB1
My advice is that since the matching probability is 25%, then do multiple IVF cycles, freeze embryos, then group them all for one PGD to maximize the chance of getting a match.