Induced Sputum Test
Sputum induction is a technique used to obtain and measure specific types of cells in sputum (phlegm that is coughed up). The number of eosinophils (inflammation cells) in the induced sputum can be associated with the severity asthma. Eosinophils are white blood cells that are involved in the inflammatory process. Sputum obtained from asthmatics during a “flare-up” contains a very high number of eosinophils than during periods of asthma control.
How is the Test Performed
During a sputum induction test you will be asked to inhale a mist of hypertonic or isotonic saline solution via an ultrasonic nebulizer. The saline may have a salty taste. You will breathe this mist for 2 minutes and then you will be asked to cough deeply to bring up the mucous (phlegm). The sequence will be repeated six times for a total of 12 minutes.
Prior to the testing procedure, you may be pretreated with a bronchodilator (Albuterol/Ventolin). You may also be asked to perform a lung function test (spirometry) or be instructed in the use of a Peak Flow Meter (hand held device which measures the speed at which air exits the lungs when you give your fastest blast). Your peak flow will be measured during the testing procedure after each 2 minute session in order to check your lung function.
How long will the test take
Sputum Induction testing often takes 1 to 1 1/2 hours.
Sputum Induction is performed on the 6th floor of Rainbow Babies and Children’s Hospital in the Bryan Diagnostic Center . Our Pulmonary Function center is staffed by specially trained respiratory therapists and technicians who will be with you during the entire testing procedure.
If your doctor has requested that a Pulmonary Function tests be obtained fro your child, you can call 216-844-TEST to set-up and appointment.