> An American programmer might not be too concerned if a body temperature measurement returns 45 degrees Celcius.

I'm baffled by this statement... I worked in the medical device industry for years at a company of 10k people and you would be hard pressed to find a sw engineer that didn't default to Celsius. Almost all sw engineers there either had EE, CpE or Biomedical Engineering degrees; Celsius is not remotely foreign to these types of engineers. I would be incredibly surprised if it was different at any medical device company.