The Daily PANCE and PANRE Question 77

A patient with acute renal failure proves a urine specimen that demonstrates normal osmolality and sodium content. The urine contains no casts, but RBCs are present. Which of the following is the most likely etiology of this patient's acute renal failure? A. prerenal cause B. intrarenal glomerulonephritis C. intrarenal acute tubular necrosis D. intrarenal interstitial nephritis E. postrenal cause Answer: E, postrenal cause In pre-renal ARF, the sodium content of the urine would be decreased (because the patient is volume depleted, so the kidneys try to retain Na - less is in the urine) In intrarenal disease, the urine would contain casts. So, this is postrenal disease (usually a big prostate or stones) which would cause normal urine with rbc's. Help Support The Physician Assistant Life for FREE! This is provided as an opportunity for anyone who appreciates this email series to help support it painlessly. If you are going to be purchasing anything from Amazon.com (books, school supplies, etc.) simply start your next Amazon.com purchase byclicking here... it's a free way for you to help support the cause! Justclick over to Amazon. Then, when you make your purchase, Amazon will send a portion of the proceeds to The Physician Assistant Life. The money goes toward paying for one-time and ongoing costs (like equipment, hosting, backup services, etc.). Thank you for supporting the site and keeping this content free! If you are studying for the PANCE or the PANRE I recommend theseReview Books.