Armywife - so glad to see you found some relief for your LO's reflux. It can be so hard on them (and us).
The DNA test I had done was called Harmony (other brands are matertint21 and panorama). I also had cystic fibrosis screening done at my midwife's, but that was weeks ago now and I think they would've called if there was a problem. I think that's the one that can be changed if your partner is also a carrier of the gene, so maybe that's what you had? I will find out for sure at my next mw appt at the start of April though.