(Note: CTA is a separate procedure distinct from CT abdomen and pelvis without and with IV contrast). CT Abdomen and Pelvis Without IV Contrast There is no significant literature supporting the use of CT abdomen and pelvis without IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen and pelvis without IV contrast). CT Abdomen With IV Contrast There is no significant literature supporting the use of CT abdomen with IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen with IV contrast). CT Abdomen Without and With IV Contrast There is no significant literature supporting the use of CT abdomen without and with IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen without and with IV contrast). CT Abdomen Without IV Contrast There is no significant literature supporting the use of CT abdomen without IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen without IV contrast). CT Enterography CT enterography requires the administration of large volumes of neutral oral contrast, which can mask bleeding by dilution. Although multiphasic CT enterography can detect bleeding because of technique parameters that can mirror CTA, the primary use of this protocol is directed more to finding a potential bleeding source when bleeding is of a slow rate, suspected in the small bowel, or occult in nature [41]. CTA Abdomen and Pelvis With IV Contrast There is no significant literature supporting the use of CTA abdomen and pelvis with IV contrast. Dual-energy CT allows for the generation of virtual noncontrast images from a CTA data set. However, the use of these virtual unenhanced images in place of true unenhanced images is still limited to certain sites and remains a user-specific preference. So, they are not discussed in this document.
Nonvariceal Upper Gastrointestinal Bleeding. (Note: CTA is a separate procedure distinct from CT abdomen and pelvis without and with IV contrast). CT Abdomen and Pelvis Without IV Contrast There is no significant literature supporting the use of CT abdomen and pelvis without IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen and pelvis without IV contrast). CT Abdomen With IV Contrast There is no significant literature supporting the use of CT abdomen with IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen with IV contrast). CT Abdomen Without and With IV Contrast There is no significant literature supporting the use of CT abdomen without and with IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen without and with IV contrast). CT Abdomen Without IV Contrast There is no significant literature supporting the use of CT abdomen without IV contrast. (Note: CTA is a separate procedure distinct from CT abdomen without IV contrast). CT Enterography CT enterography requires the administration of large volumes of neutral oral contrast, which can mask bleeding by dilution. Although multiphasic CT enterography can detect bleeding because of technique parameters that can mirror CTA, the primary use of this protocol is directed more to finding a potential bleeding source when bleeding is of a slow rate, suspected in the small bowel, or occult in nature [41]. CTA Abdomen and Pelvis With IV Contrast There is no significant literature supporting the use of CTA abdomen and pelvis with IV contrast. Dual-energy CT allows for the generation of virtual noncontrast images from a CTA data set. However, the use of these virtual unenhanced images in place of true unenhanced images is still limited to certain sites and remains a user-specific preference. So, they are not discussed in this document.