A patient with liver failure is taking lactulose (Chronulac). Which laboratory data indicates that the medication is having the desired effect?

Question

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Lactulose is used to reduce the serum ammonia level in patients with liver failure by promoting the excretion of ammonia. Therefore, a decreased serum ammonia level would indicate that the medication is having the desired effect.

A Patient with Liver Failure Is Taking Lactulose (Chronulac)