If you take breathing medicines, your doctor may ask you to stop them for a short time before spirometry, lung volume measurement, or lung diffusion capacity tests.
No special preparation is needed before pulse oximetry and arterial blood gas tests. If you're getting oxygen therapy, your doctor may ask you to stop using it for a short time before the tests. This allows your doctor to check your blood oxygen level without the added oxygen.
The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.