The nurse is caring for a 48-year-old-client admitted with complaints of fatigue and hemoptysis, but no other significant medical history. Social history includes smoking 1 pack/day x 20 years and occasional alcohol use. He denies taking any medication. The Mantoux test placed 72 hours earlier reveals an indurated area of 4 cm. Which action will the nurse plan to include in the care for this client?

The client's complaint of hemoptysis (coughing up blood) and a positive Mantoux test (4 cm induration) suggest the possibility of tuberculosis (TB) infection. TB is an airborne infectious disease, and placing the client in airborne isolation is necessary to prevent the spread of the infection to others. Antibiotics may be used to treat tuberculosis, but the initial step would be to isolate the client and confirm the diagnosis before starting specific treatment. A CT scan may be ordered to further evaluate the client's condition, but it is not the immediate action required in this case. Isolation and confirmation of the diagnosis take priority. While the client may require oxygen therapy based on their respiratory symptoms, it is not the primary action to take at this stage. Isolation and further evaluation are necessary before initiating specific treatments.