We did Counsyl screening on both DH and the donor. It covers CF and a huge number of other things, including spinal muscular atrophy. I know this because my DH turned out to carry SMA, but since the donor was clear, we went ahead. In a way, I'm thankful that we didn't just get pg naturally, because we wouldn't have tested, and who knows, I might be a carrier as well (for Caucasians, the risk is 1 in 35).