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. Sputum culture and sensitivity: Monitoring sputum cultures helps determine whether the antibiotic is effectively targeting the causative pathogen. A reduction or elimination of bacterial growth indicates that the infection is responding to therapy. B. Capillary glucose: Blood glucose monitoring is important for clients with diabetes or those on medications affecting glucose, but it does not indicate the effectiveness of an antibiotic for a respiratory infection. C. White blood cell count: A decreasing WBC count toward normal levels suggests that the body’s infection response is resolving, indicating effectiveness of the antibiotic. Persistent elevation may signal ongoing infection or resistance. D. Urinalysis: Urinalysis is unrelated to respiratory infections unless there is a concurrent urinary tract infection. It does not provide relevant information regarding antibiotic effectiveness for respiratory pathogens. E. Serum potassium: Potassium levels are important when clients are on medications that affect electrolytes but are not directly related to evaluating the success of antibiotic therapy. F. Prothrombin time: PT assesses coagulation status and is not relevant to monitoring the effectiveness of antibiotics in treating respiratory infections.