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

A. White blood cell count: Monitoring the WBC count helps determine the body’s response to antibiotic therapy. A decreasing WBC count indicates that the infection is resolving and the antibiotic is effectively targeting the causative organism. B. Capillary glucose: Blood glucose monitoring is not directly related to evaluating antibiotic effectiveness. It is typically relevant for clients with diabetes or those receiving corticosteroids, rather than for tracking infection resolution. C. Serum potassium: Potassium levels are not used to assess antibiotic response. They are more commonly monitored when medications that affect renal function or electrolyte balance, such as diuretics or certain IV antibiotics, are administered. D. Sputum culture and sensitivity: Repeating the sputum culture identifies whether the pathogen has been eradicated or remains resistant. This test confirms whether the antibiotic selected is effective against the specific organism causing the respiratory infection. E. Urinalysis: Urinalysis evaluates kidney or urinary tract conditions, not respiratory infections. It would not provide information about the antibiotic’s effectiveness in treating lung or airway infections. F. Prothrombin time: PT is used to assess coagulation function, especially in clients on anticoagulant therapy. It does not provide any information about infection control or antibiotic effectiveness.