Respiratory

FEV1/FVC Ratio

Normal Range

70-80%

Sample Type: Standard
Fasting: No
Unit: %

Ratio used to distinguish obstructive from restrictive lung disease.

Why Context Matters

Age dependent.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for FEV1/FVC Ratio:

Official Sources

Chronic Obstructive Lung Disease: Treatment Guidelines and Recommendations for Referral and Multidisciplinary Continuity of Care - PMCpmc.ncbi.nlm.nih.gov
GOLD 2024: a brief overview of key changes - PMCpmc.ncbi.nlm.nih.gov

Research & Guidelines

PubMed: FEV1/FVC Ratio Clinical GuidelinesNCBI / PubMed

Related Indicators

Pulmonary Function Test

Forced Vital Capacity (FVC)

Forced Expiratory Volume (1s) (FEV1)

DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

Get Notified When Dr. Babu Is Available

Secure, private, and verified medical interpretations.