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In page Cystoscopy:

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Prior to the early 1990s, it was common practice for the physician performing the procedure to prescribe an antibiotic to take for a few days to prevent an infection. Since that time, many urologists will order a "urine C & S" (urinalysis with bacterial/fungal cultures and testing for sensitivities to anti-infective medications) prior to the performance of the cystoscopy, and as part of the pre-operative workup. Depending on the results of the testing and other circumstances, he or she may elect to prescribe a 10- to 14-day course of antibiotic or other anti-infective treatment, commencing 3 days before the cystoscopy is to be performed, as this may alleviate some inflammation of the urethra prior to the procedure.[citation needed]