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Why is it ok to scald patients in third world countries? What if the quirks lead to misdiagnosis etc? If there was a way to produce this technology safely and cheaply people would be doing so

My point was that it might be better to accept a risk of scalding if it saves lives. A really cheap ultrasound could have all sorts of bad attributes -- and still be worth it to the people who are using it. It could make an incredible positive difference in people's lives. There is no universal set of standards. It varies a lot depending on particular circumstances.

If risk of scalding means the price can be reduced to a point to where every ambulance or high-speed paramedic car can have one, then it is worth it. If it means that every back-water third-world doctor can have one, great. Sometimes knowing if a patient has internal bleeding, and where, is worth the risk.

Don't forget to balance that advantage with the risks and harms of over testing.

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