Pulmonary Function Testing Specialist

Sandra A. Ho, MD -  - Allergy, Asthma, & Immunology Physician

Avant Allergy

Sandra A. Ho, MD

Allergy, Asthma, & Immunology Physician located in Los Angeles, CA

Lung problems and diseases such as asthma or chronic obstructive pulmonary disease can make breathing a challenge. Sandra A. Ho, MD, uses pulmonary function testing (PFT) to determine how well your lungs work. At Avant Allergy, in Los Angeles, California, PFT testing diagnoses lung disorders such as asthma, allergies, emphysema, and chronic bronchitis. If you experience lung or breathing problems, call the office or use the online booking tool to schedule your assessment today.

Pulmonary Function Testing Q & A

What is a pulmonary function test?

A pulmonary function test (PFT) measures breathing and the lungs’ ability to bring oxygen to the rest of the body. During the test, you sit in a chair and blow into a mouthpiece. PFTs evaluate two disorders that inhibit the lungs from doing their job: airway resistance and restricted expansion. There are four common types of pulmonary function testing:


This test measures the volume and speed of your air inhalation and exhalation. Spirometry testing helps doctors confirm an asthma diagnosis and measure treatment effectiveness.

Lung volume tests

This test measures the eight separate volumes of air. Asthma patients may experience lung volume changes and lung volume tests aid in diagnosis and treatment.

Airway resistance tests

These tests measure the ease in which air moves in and out of the lungs. Asthma causes the airways to narrow, and airway resistance tests assist Dr. Ho in determining the impact.

Are there risks to pulmonary function tests?

PFTs are safe and quick for most patients. For patients with decreased lung capacity, PFTs may cause symptoms or side effects, including:

  • Dizziness
  • Coughing
  • Shortness of breath
  • Asthma attacks


Some patients report extreme tiredness after their PFT, especially those with a history of lung and breathing issues.

How do I prepare for my PFT?

Dr. Ho may ask you to stop taking certain medications before your test, as that may skew your results. Ensure she knows all the medicines you take, including those available over the counter. 

On the day of testing, avoid large meals, caffeine, strenuous exercise, and smoking as they can affect the test results. Wear loose clothing and avoid any jewelry that may affect your breathing ability. Patients who use dentures need to wear them during the testing to ensure the mouthpiece fits correctly.

If you experience breathing difficulties or have asthma or COPD, schedule an appointment to evaluate lung function at Avant Allergy. Call the office today or use the online booking tool.