⁃ Patients undergoing screening colonoscopy are an accessible cohort for BE screening and are also a reasonable representation of the general population. Permission will be obtained from colonoscopy physicians for researchers to contact and recruit patients for this study. Patients without GERD, who are at risk for BE, and who have not had a prior EGD, will be recruited prior to or at the time of scheduled colonoscopy.(9) Those eligible will be:

• Adults who have not had prior EGD within past ten years, and are able to provide informed consent, and who have:

• No known coagulopathy, no known esophageal varices, not on chronic anticoagulation therapy, and have:

• No significant dysphagia or odynophagia; but who do have:

• Absence of GERD (absence of weekly heartburn or regurgitation, not on medications for GERD), and are:

• Adults \> age 50, who also have two or more added risk factors for BE from the set of: central obesity (waist size \> 35 inches for women and \> 40 inches for men), current smoker or smoking history \> 10 pack years, white race, male sex, confirmed history of BE/EAC in at least two family members, with one a first degree relative. While BE is most highly prevalent in white males, a black female over age 50 with obesity and a positive smoking history would also be at increased BE risk and would equally meet eligibility criteria.

• Subjects must have the ability to understand and the willingness to sign a written informed consent document.