The nurse administers an antibiotic to a client with a respiratory tract infection. To evaluate the medication's effectiveness, what laboratory value(s) should the nurse monitor? Select all that apply.

A. Blood urea nitrogen (BUN) is not typically monitored to evaluate the effectiveness of antibiotics in treating respiratory tract infections. It is more commonly monitored to assess renal function and hydration status. B. White blood cell (WBC count is monitored to evaluate the body's response to infection and the effectiveness of antibiotic therapy. A decrease in the WBC count can indicate resolution of the infection. C. Red blood cell (RBC count is not directly related to the evaluation of antibiotic effectiveness in treating respiratory tract infections. D. Urinalysis is not typically monitored to evaluate the effectiveness of antibiotics in treating respiratory tract infections unless there are specific indications of urinary tract involvement. E. Sputum culture and sensitivity testing is important to identify the causative organism of the respiratory tract infection and determine its susceptibility to antibiotics. Monitoring the results of sputum culture and sensitivity helps ensure appropriate antibiotic selection. F. Serum potassium levels may be monitored for clients receiving certain antibiotics, such as some types of penicillins or fluoroquinolones, due to the potential for electrolyte disturbances. However, it is not a direct measure of antibiotic effectiveness in treating respiratory tract infections.