Introduction: To date, nearly all studies examining gender disparities in colorectal cancer screening report a lower endoscopic screening rate in women. Using a statewide claims database with full capture of patient encounters, gender differences in screening rates were analyzed in an attempt to validate gender disparities reported in prior survey based studies. Methods: Procedural-level dataset containing all patient encounters for 2003 in which a colonoscopy or flexible sigmoidoscopy were performed was created for patients residing in Wisconsin from the Physician Outpatient Visit Database and the Ambulatory Surgery Discharge Database. Procedures were selected using CPT codes and surveillance or screening designation was determined using ICD-9-CM codes. Univariate analysis was performed using SAS v 8.0. Results: Statewide for average-risk individuals 50 years or older, 65,232 endoscopic procedures were performed in 2003. The majority (83%) of endoscopic screening procedures were colonoscopies. Overall, the rate of screening in average-risk women 50 years old or older (38 procedures / 1000 people) was slightly lower than men (42 / 1000), but not statistically significant. The rates of screening were higher in women before the age of 60 years old compared with men and lower after the age of 60 years old [Figure 1]. No clinically significant difference was found in the type of screening procedure performed. Colonoscopy was done in 81% of men and 84% of women. Conclusions: Gender disparities in rates and types of colorectal cancer screening reported in prior survey studies are not validated in this patient encounter data study. There is no overall statistically significant difference in rates of screening or type of screening. However, screening rates of men and women do vary across age groups with more women being screened at younger ages compared with men.