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

Choice A reason: Monitoring the WBC count can help determine if the antibiotic is effectively treating an infection, as a decreasing count may indicate recovery. Choice B reason: The RBC count is not typically affected by respiratory infections and is not a direct indicator of antibiotic effectiveness. Choice C reason: Serum potassium levels are not directly related to the effectiveness of antibiotics for respiratory infections. Choice D reason: BUN levels are more indicative of kidney function and are not used to evaluate antibiotic effectiveness for respiratory infections. Choice E reason: A sputum culture and sensitivity test can identify the causative bacteria and determine if the antibiotic is effective. Choice F reason: Urinalysis is not directly related to respiratory infections but can be part of a broader assessment of health.