A client with advanced cirrhosis is being treated for hepatic encephalopathy. In reviewing the client's serum laboratory results, which finding requires the most immediate intervention by the nurse?

A. Decreased ammonia is a positive sign, indicating effective treatment for hepatic encephalopathy. B. Lowered total protein and albumin are common in advanced cirrhosis but do not typically require immediate intervention compared to other findings. C. Prolonged PT is critical because it indicates a high risk of bleeding due to impaired liver function, necessitating immediate attention. D. Elevated direct bilirubin is indicative of liver dysfunction but is less immediately critical compared to bleeding risks.