It just so happens that I have pictures to show the difference between the BPD and the BPD-DS:
If you really have a Scopinaro BPD, you have a very large pouch, distal RNY. It looks like this:
A true DS (sometimes called a BPD with DS/duodenal switch) looks like this:
More and more these days, the DS is called the Verticla Sleeve Gastrectomy with Duodenal Switch, which is really more accurate. But if you have ANY questions, show these pics to your surgeon and have him point out the one he's planning on giving you.