Spirometers used to measure FEV₁ should be able to measure flows in the range of 0 to 14 L/sec (ATS-ERS,2005).The maximal resistance allowable at all flows is: A) Less than 6 cmH₂O/L/sec B) Less than 1.5 cmH₂O/L/sec C) Determined by the type of filter used D) One half of the flow rate in L/sec

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The question is asking for the maximal resistance allowable at all flows for spirometers used to measure FEV1. According to the ATS-ERS guidelines, the range of flows to be measured is 0 to 14 L/sec. Therefore, the maximal resistance allowable at all flows should be less than 1.5 cmH2O/L/sec.

Spirometers Used to Measure FEV1 Should Be Able to Measure

Spirometers Used to Measure FEV₁ Should Be Able to Measure