Certified Nephrology Nurse Certification (CNN) Practice Exam

Polyuria is the medical condition characterized by frequent urination, which involves producing an abnormally large volume of urine. This condition can result from various factors, including uncontrolled diabetes mellitus, excessive fluid intake, or certain medications. In the context of nephrology, understanding polyuria is essential, as it can indicate underlying renal issues or systemic conditions affecting urine production.

On the other hand, oliguria refers to low urine output, while anuria is the complete absence of urine, which are both clearly distinct from polyuria. Azotemia, which involves an increase in nitrogen waste products in the blood, does not directly correlate with the frequency of urination but signifies potential kidney dysfunction. Thus, recognizing polyuria is crucial for identifying and addressing underlying health concerns.