I can well believe that use - I had a set for much the same purpose for checking urine loss in patients. I left them in the store room at the clinic I was then based at, and realised a few weeks later that they weren't there. The District Nurse told me a couple of days later that she had taken the scales out of the store room to give to a newly diagnosed diabetic who needed to weigh his food. I didn't have the heart to tell her what they had been being used for!