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!
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.
Also Read: Asthma
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.
