path renal question

[blazers]

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I found this path question online, and was hoping someone could help me answer this question and how to go about answering this question.

A 63-year-old man is brought to the emergency department 3 hours after the acute onset of severe right-sided flank pain. He has a 9-year history of gout. His blood pressure is 110/84 mm Hg, pulse is 78/min, and respirations are 16/min. Examination shows normal bowel sounds and no abdominal tenderness or masses. Urinalysis shows 40 erythrocytes/hpf. Intravenous pyelography confirms a right ureteral calculus. Which of the following is the most likely underlying mechanism of this patient's urolithiasis?

A) An increase in urinary pH
B) Damage to the epithelial lining of the ureters
C) Lack of inhibitors of crystal formation
D) Presence of urease-splitting bacteria
E) Urinary supersaturation with uric acid


Neither first aid, nor kaplan medessentials, nor kaplan lecture series book in pathology has this information. How are you supposed to answer this question? the answer is E

All Kaplan Medessentials has is that uric acid stones are "seen in gout, leukemia, and in patients with acidic urine"

 

[blazers]

Nm i got it. leukemia means low rbc count and that is seen in the question. it is E. but can tell me what normal rbc count is in urinalaysis?