Hopefully, my PM landed?!I agree, @elli, and have experienced it. And I promise I've never been "very thin, much thinner than most women would want to bother with." (Not to pick on you, Steve, but it is a misconception. It's often stress based, or... who knows.) Happy to discuss further via PM if anyone has questions or interest on this subject.
Yes, most tests administered by some sort of exercise professional range from 3 up to 9 different sites. Here in Canada the standard is a 5 site, though our preferred test through the national governing body doesn't give an actual body fat % for whatever reason - they just classify as excellent, good, fair, poor, etc. I think the US uses the Jackson & Pollock (not related to the modernist haha) 5 or 7 site as their gold standard. I