Suggested algorithm for evaluating a raised ALP (ALP, alkaline phosphatase; ERCP, endoscopic retrograde cholangiopancreatography; GGT, gammaglutamyl transferase; PT, prothrombin time; MRCP, magnetic resonance cholangiopancreatography). Suggested algorithm for evaluating a raised ALP (ALP, alkaline phosphatase; ERCP, endoscopic retrograde cholangiopancreatography; GGT, gammaglutamyl transferase; PT, prothrombin time; MRCP, magnetic resonance cholangiopancreatography). J K Limdi, and G M Hyde Postgrad Med J 2003;79:307-312 Copyright © The Fellowship of Postgraduate Medicine. All rights reserved.