A client with tuberculosis has AST 50 U/L and dark urine. Which finding requires further evaluation?

A client with tuberculosis has AST 50 U/L and dark urine. Which finding requires further evaluation?

• A. AST 40 U/L with dark urine
• B. AST 60 U/L with clear urine
• C. AST 50 U/L with dark urine
• D. AST 30 U/L with dark urine

Answer: (C)

In liver function and drug safety, a marker of liver cell injury (AST) paired with dark urine (which points to bilirubin in the urine) signals potential hepatotoxicity. In tuberculosis therapy, hepatotoxic meds are common culprits, so any combination of even a mild AST rise with bilirubinuria warrants further evaluation to prevent progression to more severe liver injury. A mild AST elevation around 50 U/L indicates hepatocellular irritation, and when dark urine accompanies it, it suggests bilirubin handling is affected. This is more concerning than dark urine with a normal AST or a higher AST without bilirubinuria, because the latter could reflect nonhepatic factors or isolated enzyme rise, whereas the current pairing points to hepatic involvement needing closer monitoring—repeat liver tests, bilirubin, alkaline phosphatase, and INR, and a review of TB meds for potential adjustment.

In liver function and drug safety, a marker of liver cell injury (AST) paired with dark urine (which points to bilirubin in the urine) signals potential hepatotoxicity. In tuberculosis therapy, hepatotoxic meds are common culprits, so any combination of even a mild AST rise with bilirubinuria warrants further evaluation to prevent progression to more severe liver injury.

A mild AST elevation around 50 U/L indicates hepatocellular irritation, and when dark urine accompanies it, it suggests bilirubin handling is affected. This is more concerning than dark urine with a normal AST or a higher AST without bilirubinuria, because the latter could reflect nonhepatic factors or isolated enzyme rise, whereas the current pairing points to hepatic involvement needing closer monitoring—repeat liver tests, bilirubin, alkaline phosphatase, and INR, and a review of TB meds for potential adjustment.