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Polyuria in an otherwise healthy patient  
A man complains of polyuria and nocturia. What defines polyuria and how do you tell that condition from a urologic cause of urinary frequency? What happens if both exist? Where does the work-up start? There are some basic evaluation algorithms here, but it can get tricky when you mix up your units. Take a look at this discussion.

Summary provided by Roger Rodby, MD, FASN.
Previous Community Minded Summaries are available at: https://community.asn-online.org/browse/communityminded