Finding-the-Path: Abdominal scintigraphy using Tc-99m labelled red blood cells

Dynamic scintigraphy of the abdomen following the intravenous injection of Tc-99m labelled red blood cells (Dynamic GI Bleeding Scan) shows a collection of radioactivity in the left side of the pelvis (focal increased uptake) indicating bleeding in the sigmoid region (arrow).

Which study do you request next?

• Upper GI series
• Barium enema
• Ultrasound
• Mesenteric angiogram
• CT of the abdomen and pelvis