The nurse is assigned to care for a client with cytomegalovirus retinitis and acquired immunodeficiency syndrome who is receiving foscarnet (Foscavir). The nurse carefully monitors which of the following laboratory test during the treatment with this medication, except?
A. Serum creatinine.
B. Serum calcium.
C. Serum magnesium.
D. Serum sodium.
Correct Answer: D. Serum sodium.
Renal impairment is the major toxicity involved in Foscarnet (Foscavir); This medicine also may cause decreased levels of calcium, magnesium, phosphorus, and potassium.