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Spirometry Calculator

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Spirometry Calculator
Age Sex
Height (cm) Predicted
FEV1
FVC
FEV1/FVC Ratio
PEFR

This calculator uses an algorithm derived from healthy adult lifetime nonsmokers in Australia.1

Measurements made in Spirometry
Abbreviation Measurement Description
VC (SVC) Vital capacity (Slow vital capacity) Maximal amount of air exhaled steadily from full inspiration to maximal expiration (not time dependent). It should be >80% of predicted, reduced in restrictive disease.
FVC Forced vital capacity Volume of lungs from full inspiration to forced maximal expiration. It is reduced in restrictive disease, and in obstructive disease if air trapping occurs.
FEV1 Forced expiratory volume in one second Volume of air expelled in the first second of a forced expiration. Reduced in both obstructive and restrictive disease.
FEV1% (FER) Forced expiratory ratio (FEV1/FVC)x100 Percentage of FVC expelled in the first second of a forced expiration.
Normal in restrictive disease - reduced in obstructive disease.
FEF 25-75% Forced Expiratory Flow between 25-75% Average expiratory flow rate at the middle part of forced expiration. It is a more sensitive indication of what is happening in the middle/lower airways, but is not as reproducible as FEV1. Normal in restrictive disease.
PEFR Peak expiratory flow rate Maximum rate of airflow achieved during expiration

Document references

  1. Gore CJ, Crockett AJ, Pederson DG, et al; Spirometric standards for healthy adult lifetime nonsmokers in Australia. Eur Respir J. 1995 May;8(5):773-82. [abstract]

Acknowledgements

EMIS is grateful to Dr Huw Thomas for writing this article. The final copy has passed scrutiny by the independent Mentor GP reviewing team. ©EMIS 2009.
Document ID: 2797
Document Version: 21
Document Reference: bgp2357
Last Updated: 30 Jun 2009
Planned Review: 29 Jun 2014

The authors and editors of this article are employed to create accurate and up to date content reflecting reliable research evidence, guidance and best clinical practice. They are free from any commercial conflicts of interest. Find out more about updating.

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