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Avoid eating, smoking, and exercising four to eight hours before the test.

• You can eat or drink before the test, but we don't advise strenuous exercise or eating a substantial meal before your visit. 
• Your doctor can urge you to adhere to additional recommendations before testing, such as Medications, depending on your medical condition.

• For the most part, PFTs are safe. 
• However, you might feel lightheaded or have trouble breathing because the test might call for you to breathe swiftly in and out. 
• Additionally, you run the danger of passing out. 
• Inform your doctor if you have dizziness.

To walk during the Lung Function Test, you must wear comfortable shoes or loose-fitting clothing.

• The non-invasive, painless lung function tests are available. 
• They entail breathing into and exhaling into specialized equipment. 
• The entire set of tests takes 20 to 60 minutes. 
• A test called spirometry can determine how well you breathe in and out.

You must avoid caffeine because it can open up your airways and let more air through than usual.

• If your healthcare practitioner advises you to stop taking specific medications before the operation, stop taking them.
• If your doctor advises you to stop smoking before the test, do so.
• Stop eating a heavy meal if your healthcare practitioner advises you to avoid consuming a large meal before the test.

The fact that you can feel exhausted following the test and should get lots of rest is typical.