Daniel was diagnosed using cord blood at 2 days old. He was showing echogenic bowel while I was pregnant with him and so the drs decided that cord blood would be the best testing option. It was all planned prior to my delivery. Although after he was born and we were waiting for the results one of the drs in the hospital nursery wanted to draw blood because he remarked that "it would take too long to separate my blood from his" with the cord blood sample that was sent. It ended up not being an issue because his results came back within an hour of the dr saying that. Don't know if it makes any difference but we knew what mutations we were looking for as well. To this point no one has had an issue with how he was diagnosed.