FEV1/FVC Ratio

What is the FEV1/FVC ratio? Why is the test done? Everything around this, that you should know, in this post, and of course our doctors are always there to help you. Just fill in your details in the form below and we will answer all your questions for FREE!

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What is the FEV1/FVC ratio?

The FEV1/FVC ratio is also known as the Tiffeneau-Pineli Index. Its calculated ratio is used in the diagnosis of obstructive and restricted lung disease. It helps in reflecting the amount of air exhaled forcefully from the lungs. It is measured by spirometry.

Why is it done?

FEV1 /FVC is also done to diagnose obstructive and restricted lung disease and to see the functioning of the lungs.

What is the average value of the FEV1/FVC ratio?

FEV1/FVC ratio should be greater than 75%.

Abnormal FEV1 And FVC results

FEV1/FVC Ratio	Severity of condition
>70%	Mild
60-69%	Moderate
50-59%	Moderate severely
35-49%	Severe
<35 %	Very Severe

What are the interpreting results?

If FVC decreased with a normal FEV1/FVC ratio it shows a restrictive pattern. It means a patient can not inhale deeply as normal. It can occur due to damaged lung tissues caused by several lung conditions:

Pulmonary fibrosis
Chest deformities
Ascites
Pneumonia
Sarcoidosis
Tuberculosis
Asbestosis
Silicosis
Pleural effusion
Neurological diseases like ALS.

What does a decreased FEV1/FVC ratio indicate?

FEV1/FVC ratio interprets the consistent obstructive lung disease.

Damaged and constrictive airways indicate:

Asthma
COPD
Pulmonary fibrosis
Deformity of the chest
Tuberculosis
Neurological disorders like ALS.

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** The text on this website is sourced from websites like emedicine and/or other verified material by government agencies around the globe along with valuable inputs and additions by our team. The content of this page is proofread and updated by the team of doctors, every once in a while, to provide the most accurate information.