If you’re having symptoms of lung problems as part of a routine physical to monitor how effective your treatment is if you have a lung disease, such as asthma to assess how well your lungs are working before you have surgery. PFTs are also known as spirometry or lung function tests.How do I prepare for pulmonary function tests?If you’re on medications that open your airways, such as those used for asthma or bronchitis, your doctor may ask you to stop taking them before the test. If it isn’t clear whether or not you should take your medication, make sure to ask your doctor. Pain medications may also affect the results of the test. You should tell your doctor about any over-the-counter and prescription pain medications you’re taking.It’s important that you don’t eat a large meal before testing. A full stomach can prevent your lungs from inhaling fully. You should also avoid food and drinks that contain caffeine, such as chocolate, coffee, and tea, before your test. Caffeine can cause your airways to open. You should also avoid smoking and strenuous exercise before the test.Be sure to wear loose-fitting clothing to the test. Tighter clothing may restrict your breathing. You should also avoid wearing jewelry that might affect your breathing. If you wear dentures, wear them to the test to ensure that your mouth can fit tightly around the mouthpiece used for the test.
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