Microscopic hematuria definition In Nelson it's given as 1. 5 RBCs/HPF in uncentrifuged urine or 2. 10 RBCs/HPF in 10 to 15 ml of freshly voided and centrifuged urine. In Piyush book, 5 RBCs/HPF in centrifuged urine Up to date and Medscape references give 5 RBCs/HPF. Let's take Up to date reference as final fort he definition of microscopic hematuria