LAUSR

concomitant conditions which would make it difficult to assess for the presence of IC/BPS (see Figure 1). RESULTS: Of the 1,650 patients selected for in-depth chart review, 379 (23.0%) were excluded by our criteria. The majority of exclusions were due to a history of cancer. Of the remaining 1,271 patients, 561 (44.1%) met diagnostic criteria for IC/BPS, 459 (36.1%) did not and 251 (19.8%) did not have sufficient records to accurately determine if they had IC/BPS or not (Figure 1). The most common reason for not-meeting the criteria for IC/BPS was the lack of pain as a symptom, and a history of recurrent UTIs (Figure 1). CONCLUSIONS: We found a high rate of misdiagnosis of IC/ BPS, with only 44.1% of patients with an ICD diagnosis of IC/BPS actually meeting diagnostic criteria after in depth chart review. These data can be used to improve prevalence estimates of IC/BPS as well as diagnostic practices.