Meditech News
Product News
Meditech Library
General info





Home > Meditech info > Meditech Library > Spirometry Calculator

Spirometry Calculator

Spirometry Calculator

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

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]
The clinicians responsible for the production of this document are:
Original Author: Dr Huw Thomas Current Version: Dr Huw Thomas Peer Reviewer: Hilary Cole
Last Checked: 30 Jun 2009 Document ID: 2797  Version: 24 © EMIS
Home | Meditech OEM | About Meditech | Activation | Contact Us | Product News | Links |

Defibrillator | Pulmonary | ECG machine | Finger Pulse Oximeter | Multiparameter Patient Monitor | Ultrasound Scanner | Fetal doppler Monitor | OEM module | Veterinary Equipment |

2003-2011© Copyright Meditech Equipment Co.,Ltd (Meditech Group). All right reserved. Tel: 86-532-85832673 - 85803521 (801) Fax: 86-532-85832155