What are normal spirometry results?

Interpretations of spirometry results require comparison between an individual’s measured value and the reference value. If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65).

What is the normal range for lung function test?

Normal Values of Pulmonary Function Tests

Pulmonary function test Normal value (95 percent confidence interval)
FEV1 80% to 120%
FVC 80% to 120%
Absolute FEV1 /FVC ratio Within 5% of the predicted ratio
TLC 80% to 120%

What is a normal lung function reading?

If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65). When compared to the reference value, a lower measured value corresponds to a more severe lung abnormality.

How to interpret spirometry results?

Spirometry results will be considered within the normal range if FEV1/FVC > 70% (absolute value) and FVC and FEV1 > 80% of the predicted values. The pattern is classified as obstructive if FEV1

How to interpret spirometry readings?

Reduced FEV1 (<80% of the predicted normal)

  • Reduced FVC (but to a lesser extent than FEV1)
  • FEV1/FVC ratio reduced (<0.7)

    • How to interpret spirometry?

    Asthma Clinics Measure FEV1 at the yearly check. Use FEV1 in reversibility tests at diagnosis.

  • Well woman clinics Measure FEV1 in smokers.
  • COPD Measure FEV1/FVC: if this is <0.7 check reversibility.
  • Breathlessness of unknown cause Measure FEV1/FVC.

    • What do you need to know about spirometry?

    To use the incentive spirometer,sit upright in a comfortable chair or on the edge of your bed.

  • Hold the incentive spirometer upright with both hands.
  • Place the mouthpiece into your mouth and tightly seal your lips around it.
  • Breathe in slowly and as deeply as possible.