A 'sputum induction' test is a simple test that involves producing a fresh sample of sputum to be analysed.
The doctor has requested that you have this test to analyse your sputum for different cells found in your lungs.
Before the test starts the Physiologist will explain the test to you in detail and will answer any questions that you may have. The sputum induction test is a painless procedure.
Please inform the clinic coordinator (phone number on your appointment letter) if any of the following apply to you:
You should wear normal comfortable clothing.
The saline used can cause narrowing in your airways. To prevent this you will be given a medication (salbutamol) to open up the airways at the start of the test.
There are no long term side effects of performing the test. You may however find it tiring because of the repeated coughing, and it can irritate the throat. You will be given time to recover between tests.
If we are able to produce a sample, it will be sent for analysis.
You are usually told your results at your next clinic appointment or a letter may be sent to the healthcare professional who referred you for the test.
It is your decision but if you do not attend, we will not be able to pass important diagnostic information to your clinical team. This may affect the medical treatment you receive.
There are no other simple tests that provide the same information.
Pavord, I. D. et al. The use of induced sputum to investigate airway inflammation. Thorax 1997; 52:498-501.
Pizzichini, E. et al. Safety of sputum induction. European Respiratory Journal 2002; 20:9-18.
© North Bristol NHS Trust. This edition published July 2024. Review due July 2027. NBT002337.
Telephone: 0117 414 5400
Email: respiratoryphysiology@nbt.nhs.uk