I don't like thermometers (sorry), but we could do the cream idea.
Or maybe the girl would have to strip to her underwear (say, to her undershirt and panties if she's wearing a school uniform) to get weighted and she might resist and be bratty about it (as her panties would not entirely cover the redness of her bottom), which would result in her having to show her bare bottom and another spanking. After that, the doctor might even suggest that while they're in the waiting room (waiting to pay the bill), the girl should stand bare-bottomed in the corner where little patients are sometimes sent by their parents when they misbehave. The secretary is swamped with work that afternoon, so the girl would be there for some time.
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