My weight, blood pressure, etc. are my doctor's business, but there are a number of ways to handle that. Very often, the nurse takes my blood pressure, writes it down, and doesn't say anything. If I ask, I will get a general comment like "It's good," but if I want the actual numbers I have to say so specifically. They can't handle weight the same way given the usual design of those scales, but again, the only thing the nurse needs to say is "Thank you, Tea Drinker, you can step down now."
Changes in body weight are more likely to be significant than any single number, so "you've lost/gained 12 pounds since your last visit" is a more reasonable comment than "I see you're still heavy."
The worst example I've run into was, in fact, a nurse saying "You've lost 12 pounds, congratulations," because she didn't have the wit to think about the fact that yes, I had lost that much weight since my last visit, nine days earlier. It was an automatic, social "weight loss is good," overriding anything from her training about unexplained weight loss as a possible problem. Then she took my blood pressure, and it came in on the high side.
When the doctor came in I told her what happened and asked if she could retake my blood pressure in a few minutes, after I had calmed down from being told I had lost weight that quickly when I wasn't trying. (Our best guess, after running some more tests, is that it was a weird medication side effect, not a symptom of an additional problem.)
