Appendix Cpredicted Normal Values; The Ideal Study; Predicteds Available On Your Pneumocheck - Welch Allyn PneumoCheck Operating Instructions Manual

Table of Contents

APPENDIX C

PREDICTED NORMAL VALUES

In order to evaluate spirometric data, one must compare the data

with values derived from a study of a large number of normal indi-

viduals. The ideal study would:

Include only persons with no respiratory symptoms or exposure to

agents known to cause lung dysfunction such as smoking, air

pollution, or occupational exposure to inhaled chemicals or dusts.

Include a large number of persons from all age groups and races

with a diversity of body types.

Utilize equipment which measures the volume or flow rates with

extreme precision.

Include persons who could perform acceptable maneuvers with good

reproducibility.

While the ideal study does not exist, many studies are available, all

of which have unique advantages and shortcomings. Unfortunately,

universal agreement as to which studies should be used does not

exist.

The PneumoCheck provides a selection of four studies:

Knudson, 1976,,

Knudson, 1983,,

Morris, Crapo, et al.

European Communrty for Coal and Steel

Not all of these studies define the predicted values for all age

NOTE:

groups. For example, the Morris

values for female patients younger than 17 years of age. Please

refer to the notes included with each study to determine the pre-

dicted values that will be provided by the printer when ages outside

the study ranges have been selected. The PneumoCheck printer will

provide predicreds for the following height range: 85-214 cm or 33-84

inches.

study does not define predicted

Table of Contents