Two methods of estimating lung capacity have long been employed : 1, the measure of chest expansion as an index of lung capacity, and, 2, spirometer readings as the accurate measure of lung capacity.
Both of these well-known methods are simple in their application, and the measurements themselves can be made with accuracy. These two facts have resulted in their general acceptance as valuable aids in estimating standards of health, but opinions are still divided as to their value in the diagnosis of early pulmonary disease.
The following observations were undertaken in order to determine more exactly the value of both measurements as aids in the physical examination of individuals:
Three questions are to be considered in this study :
Can the respiratory capacity be accurately estimated by either or both of these measurements?
Are the measure values constant enough in the individual to allow us to accept normal standards?
GOODALL HW, LYMAN BELKNAP J. A CRITICAL STUDY OF THE VALUE OF THE MEASUREMENTS OF CHEST EXPANSION AND LUNG CAPACITYTHEIR UNRELIABILITY IN CONDITIONS OF HEALTH AND IN EARLY PULMONARY DISEASE. Arch Intern Med (Chic). 1909;III(3):211–220. doi:10.1001/archinte.1909.00050140041003
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