What is a likely diagnosis for a patient presenting with elevated alkaline phosphatase, elevated bilirubin, pruritus, dark urine, and clay-colored stools?

The presentation of elevated alkaline phosphatase, elevated bilirubin, pruritus, dark urine, and clay-colored stools strongly suggests a biliary tract obstruction.

In this scenario, alkaline phosphatase is typically elevated in conditions involving cholestasis or biliary obstruction. Elevated bilirubin indicates that there is an issue with the liver's ability to process bilirubin, which can also occur in cases of biliary obstruction since the flow of bile is impaired. Pruritus is commonly associated with the accumulation of bile acids in the bloodstream due to the obstruction. Dark urine occurs because conjugated bilirubin is excreted through the kidneys when it cannot reach the intestines. As for clay-colored stools, this is a characteristic finding in biliary obstruction, as the lack of bile reaching the intestines results in the stools lacking the normal brown color imparted by bilirubin.

These signs and symptoms collectively indicate that there is an obstruction preventing bile from being properly secreted into the intestines, which aligns with a diagnosis of biliary tract obstruction.