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In page Cystoscopy:

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The time from insertion of the cystoscope to removal may be only a few minutes, or it may be longer if the physician finds a stone and decides to remove it, or in cases where a biopsy is required. Taking a biopsy (a small tissue sample for examination under a microscope) will also make the procedure last longer. In most cases, the entire examination, including preparation, will take about 15 to 20 minutes.[citation needed]