Spirometery test


Q: What does a .8 difference mean on a spirometery test?" -- because it falls within my area of expertise.


A:   Spirometry measures how much air you can inhale and how much you can exhale; it is used to diagnose asthma, chronic obstructive pulmonary disease (COPD) and certain other conditions that affect breathing.
Two important measures are taken, forced vital capacity (FVC) which is the largest amount of air that you can forcefully exhale after breathing in as deeply as you can and Forced expiratory volume (FEV-1) which is how much you can force from your lungs in one second.
A fraction of your FEV-1 divided by your FVC to determine a percentage that's compared with the average results of people of your same height, age and sex to determine how well your lungs are functioning. A result of .8 or 80% falls in the category of normal lung function; however this does not guarantee you don't have asthma or another chronic lung condition.

Related Q&A

Q: Need prescription refill, i ran out of my proair inhaler and need a new one, the weather has made my chest extra tigh...

Q: My chest feels like someone is pushing right in the middle. It hurts and I'm finding it painful to breathe. This has ...

Q: I wake up not being able to breath and i have to kinda gasp for air and afterward i have a tightness in my chest plea...

Q: I have asthma since childhood and using medicines since long time. Until recently i have no issues with my asthma and...

Q: I have a chronic cough. Before I start the cough my back gets really itchy. Every time. And then I need an inhaler....


Dr. James Obaji M.D.

  • 247 Reviews
  • Family Physician

Dr. Suneel Sharman M.D.

  • 190 Reviews
  • Family Physician

Dr. Pat Golden M.D.

  • 169 Reviews
  • Cardiologist

Dr. Kunaal Jindal M.D.

  • 112 Reviews
  • Plastic Surgeon