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.
Answer is B. Renal impairment is the major toxicity involve in Foscarnet (Foscavir); This medicine also may cause decreased levels of calcium, magnesium, phosphorous, and potassium.