What is the American Thoracic Society standard for volumetric accuracy of spirometers?
a. ±1% error, or within 10 ml of the refer-ence value
b. ±3% error, or within 50 ml of the refer-ence value
c. ±5% error, or within 100 ml of the refer-ence value
d. ±10% error, or within 500 ml of the refer-ence value
ANS: B
When measuring the vital capacity, forced vital capacity, and forced expiratory volumes, a vol-ume-measuring spirometer should have a capacity of at least 8 L and should measure volumes with less than a 3% error or within 50 ml of a reference value, whichever is greater.
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