Some sgian dubh blades have a blood groove, and notches on the edge that is not sharpened. I am wondering which side of the handle the sharpened edge is supposed to be on...left or right.

If that's not clear...suppose the sgian was carved on one side of the handle or perhaps it has a silver thistle inlaid in the handle. The carved side would be the presentation side--meant to face outward. Now suppose that the knife was laying on a table (or a piece of tartan), point towards the viewer, and presentation side up. Which side of the knife should the sharpened edge be on?

I've seen them both ways but I'm not sure that it's not important.