punch tenderness

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Eh, I think you might be talking about the Lloyd punch.

You tap on the back at the angle of the ribs and the backbone and if they jump, they've got a kidney problem.

You don't really punch them 😱
 
Yes, goofy one is probably correct. I believe that you are referring to "costovertebral angle tenderness" or CVA tenderness. On physical exam, it can be used to denote pyelonephritis. I wouldn't advice punching them too hard either, usually a tap over one hand is sufficient to elicit the response. Unless you don't like them, then you can punch them hard.
 
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