Question: Which of the following patients is most likely to require urology referral for cystoscopy? A. 67 year old male with 0-2 RBCs per hpf on urinalysis B. 40 year old female with red blood cell casts found on urinalysis C. Grossly red urine with red supernatant after centrifugation D. 47 year old female with 30 year history of tobacco use with 5 RBCs per hpf on urinalysis