 Pre-operative evaluation for SUI includes a history and physical exam. The physical exam may include an empty supine stress test ESST, standing cough stress test CST, pyridium pad test, and urodynamics UDS. Prior studies have been performed to determine which of these tests are best at identifying SUI. One systemic review found that UDS was 92 sensitive in identifying SUI. When comparing UDS to the cough stress test and the weighed pyridium pad test, the cough stress test was found to be 90 sensitive and the pyridium pad test only 60 sensitive. The pyridium pad test was 68 sensitive when a pad test was found to be positive by orange color stain noted on the pad. 