Sputum induction

• Can be used for patients unable to cough up sputum.


• Deep coughing is induced by inhalation of an aerosol of warm, sterile, hypertonic saline (3%-15%).


• As induced sputum is very watery and resembles saliva, it should be labeled “induced” to ensure that the laboratory staff do not discard it.


• Patients should have fasted for 3-4 hours prior to the procedure to prevent vomiting and aspiration.


• Induction should be carried out in a well-ventilated place and all personnel in the room should use an N95 respirator.