A body fluid leakage detection aqueous composition, for use e.g. in intraoperative pancreatic fluid leakage detection. The composition comprises a gelling agent, increasing the viscosity of the composition, and buffering species, the composition thereby being buffered. The gelling agent is cross-linked α-glucan microspheres. Further, the composition comprises a pH-indicator. The pH of the composition is at least 0.1 pH units lower, or higher, than a p