Overview Certification is necessary in order to remain competitive in GI nursing today! SGNA has teamed up with Doris Barnie, MSN RN CGRN, to present her legendary certification review course to SGNA membership. Course content, written by Ms. Barnie, has been revised and is now being presented by faculty trained by Ms. Barnie. Course Content The SGNA Doris Barnie Certification Review Course covers the following topics over a two day period: