ATS Pulmonary Function Laboratory Manual

chapter  8

erized systems report and account for the switch-in-error automatically, but it is still preferable for continu- ous recordings of spirometry to be available so the computer-computed adjustments for switch-in-errors can be confirmed by the technologist.

Appendix 8. 3 Calculations for FRC pleth The simplified calculation for determining FRC using the plethysmograph is: FRC pleth =− ( Δ V/ Δ P ) × P B

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