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Pulmonary Function Tests

​The Pulmonary Function Lab offers a range of lung function tests to obtain readings of the lung volumes or capacity. 

Pulmonary Function Tests
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These tests are non-invasive procedures which involve a series of breathing maneuvers through lung testing devices. The Respiratory Care Service team at the Pulmonary Function Lab will guide and coach patients to perform the test with optimal technique. ​Specific lung function tests will be ordered by the Physician to investigate, diagnose and treat patients accordingly.​​​


  • Exhale Nitric​ Oxide
  • Spirometry (Pre/ Post Bronchodilator)
  • Flow Volume Loop
  • Static Lung Volume N2 Washout
  • Static Lung Volume Plethysmography
  • ​Diffusion Test (Single breath hold)
  • Maximum Inspiratory and Expiratory Pressure
  • Methacholine Challenge Test
  • Exercise Induced Asthma Test
  • Cardiopulmonary Exercise Test
  • 6-Minute Walk Test
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  • No​ fasting is required; patients are encouraged to take a light meal before their appointment.
  • Do take note that there are some contraindications for the tests. Uncontrolled high/low blood pressure is one example, hence please ensure regular medications are taken as prescribed by your doctors unless told otherwise.
  • You may be advised to omit inhaler/ bronchodilator prior to the test, depending on the instructions given by your referring doctor.
  • If you wear dentures or hearing aids, please wear them for the test. However, do note that you may be requested to remove your dentures if needed.
  • If you feel unwell before the test or had any recent surgery (within 1 month), please inform our staff and we can help to reschedule your Pulmonary Function Lab appointment.

A technologist will explain the steps and procedures for each test. Patients are to follow the cues as guided by the technologists in a step-by-step basis.

For the lung function tests, the patient will be doing a series of breathing maneuver from the mouth on specific devices. A nose clip will be placed on the nose to keep the nostrils closed. The lung function tests are non-invasive but would require maximal effort by the patient to obtain accurate readings of the lung volumes.

For each ordered procedure, the patient will need to repeat the test for a few trials to ensure consistent and accurate results.​ Do inform the technologists if you feel unwell during the test.

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Contributed by Respiratory Care Services, Allied Health Services
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