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Breathe out as quickly and as hard as possible through a mouthpiece connected to a measuring device known as a spirometer. During this forced exhalation, the devices measures a number of parameters that are then compared to those obtained from another person of the same age, sex and size, without breathing problems and thus termed “normal”. Spirometry requires active co-operation from the patient. After an initial measurement, the second test is carried out 15 minutes later to assess the effect of administering a drug.


Aim of procedure: The aim of the procedure may be diagnostic (diagnosis may be abnormal in certain respiratory diseases). It can also help assess the effects of certain diseases on respiratory function, and can be used to monitor the progress of a disease or the efficacy of a treatment.



Technical details of the examination:



Bronchodilator drugs should be stopped before the test; the period may vary.
Short-acting drugs (Atrovent®, Ventolin®, Berotec®, Duovent etc) must be stopped 6 hours beforehand, while long-acting drugs (Serevent®, Oxis®, Foradil®, Seretide®, Symbicort®), must be stopped at least 12 hours before the test.
You should stop using tobacco 6 hours before the test.
Similarly, you should avoid physical exercise or exposure to cold or mist during the two hours preceding the test.


Between 15 and 45 minutes.


Patients suffering from contagious diseases are requested to advise the staff accordingly so that the necessary measures can be taken. Pulmonary tuberculosis is a contraindication for spirometry.


Coughing may occur during forced exhalation.


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