There isn't any sort of blood test that'll tell you that. Well, it is thought that having Pattern A particles (VAP or NMR test) is good. Having high HDL is good, having low triglycerides is good. We simply don't know when/if having high LDL with everything else looking good is an issue. It doesn't seem to be the case with low carbers.

I tend to thing the carbs (sugars) cause the LDL to oxidize and that is when you run into issues.