How do you assess liver function and distinguish cholestatic from hepatocellular injury in a dog?

Prepare for the Veterinary IV CFE Test with flashcards and multiple choice questions. Each question includes hints and explanations. Ensure success with our comprehensive test prep!

Multiple Choice

How do you assess liver function and distinguish cholestatic from hepatocellular injury in a dog?

Distinguishing hepatocellular injury from cholestasis relies on patterns of enzyme changes and how they reflect different parts of the liver’s function. When hepatocytes are damaged, they release enzymes such as ALT (and AST) into the blood, so elevations of ALT point toward hepatocellular injury. In contrast, cholestasis—impaired bile flow—tends to raise enzymes tied to the biliary tract, especially ALP and GGT, because these pathways are activated or released with biliary obstruction or stasis. Bilirubin levels also rise with impaired bile flow, and bile acids can help gauge hepatic function and cholestasis. Imaging can reveal ductal dilation or obstructions, and liver biopsy provides definitive tissue diagnosis when needed. So the best approach is to interpret ALT elevations as evidence of hepatocellular injury, and ALP/GGT elevations as evidence of cholestasis, with bilirubin and bile acids aiding assessment of severity. Imaging and biopsy serve as additional tools to confirm the underlying cause and extent of pathology.

Distinguishing hepatocellular injury from cholestasis relies on patterns of enzyme changes and how they reflect different parts of the liver’s function. When hepatocytes are damaged, they release enzymes such as ALT (and AST) into the blood, so elevations of ALT point toward hepatocellular injury. In contrast, cholestasis—impaired bile flow—tends to raise enzymes tied to the biliary tract, especially ALP and GGT, because these pathways are activated or released with biliary obstruction or stasis. Bilirubin levels also rise with impaired bile flow, and bile acids can help gauge hepatic function and cholestasis. Imaging can reveal ductal dilation or obstructions, and liver biopsy provides definitive tissue diagnosis when needed.

So the best approach is to interpret ALT elevations as evidence of hepatocellular injury, and ALP/GGT elevations as evidence of cholestasis, with bilirubin and bile acids aiding assessment of severity. Imaging and biopsy serve as additional tools to confirm the underlying cause and extent of pathology.

More practice questions