Final answer:
The nurse should monitor liver function tests when a client is taking Ritonavir, as it can lead to hepatic damage and affect liver enzymes. The answer is option D.
Step-by-step explanation:
A nurse caring for a client who is taking Ritonavir to treat HIV infection should monitor liver function tests (LFTs) for abnormalities. Ritonavir can cause hepatic damage, which may lead to elevated levels of liver enzymes in the blood.
It is essential to check for elevated levels of alkaline phosphatase, alanine aminotransferase (ALT), aspartate aminotransferase (AST), direct bilirubin, and total bilirubin, which are indicators of liver function and can be affected by the medication. While blood glucose levels, white blood cell count, and platelet count are also important laboratory parameters, they are not the primary concerns when monitoring for Ritonavir's side effects.