… need to have other tests too, such as spirometry and a peak flow test . How should I prepare? Smoking before the FeNO … children). Some devices will make a sound to help keep the flow at the right level throughout the test. You may have to …

… Tests to measure your oxygen levels Tests to check the level of oxygen in your blood can be helpful in diagnosing or … include: pulse oximetry blood gas test long term oxygen therapy (LTOT) assessment hypoxic challenge (fitness-to-fly) …