How many red blood cells (RBCs) defines asymptomatic microscopic hematuria according to the American Urological Association?

Asymptomatic microscopic hematuria, as defined by the American Urological Association (AUA), is characterized by the presence of more than three red blood cells (RBCs) per high-power field in a urine sample. This specific threshold is established because it helps in the identification of potential underlying conditions that may require further investigation, such as urinary tract infections, kidney stones, or tumors. By setting the number at more than three RBCs, the AUA emphasizes the need for a clear and quantifiable criterion to distinguish between normal variability in urine and significant findings that may point to health issues. Thus, the answer accurately reflects the established guideline for diagnosing asymptomatic microscopic hematuria.