Niadla,

I was diagnosed at our 19w u/sound with SUA - our DS risk was already increased, at 1:117, but from the articles I've found, SUA isn't a marker for DS at all. It can be associated with T13 and T18, and "chromosomal abn" in general, but I couldn't find any medical article linking it with DS. We also have increased risk of urologic/renal problems as my DH had congenital urologic problems (ectopic ureters).
We have another scan at 26w to check growth and cardiac stuff again (with the SUA and increased down syndrome risk), but no-one is overly concerned as there are no abnormalities showing up so far.

More watching and waiting, really. Glad all is progressing well for you and your little one so far!

Tricia