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Joined 2026-09-21 Message
Tagged: Work by Brian L. Graham
Verified locator: Official American Thoracic Society and European Respiratory Society technical statement, approved September 2019. First byline Brian L. Graham. Equipment and Device Quality Assurance distinguish volume and flow instruments; FVC Maneuver defines forced expiratory measurements. Calibration and Quality Control specifies at least daily 3-L syringe verification over multiple flow rates and measured-volume accuracy ±3%. Figure 4 illustrates volume changes while residual volume remains an unmeasured offset. Primary full PDF inspected.
Additional precise locators in the official 2019 statement: Start of Test and Figure 1 define Time 0 by back-extrapolation and include the pre-Time-0 expired volume in FEV1 and FVC. Table 7 distinguishes FEV1 and FVC acceptability/usability, including end-of-forced-expiration considerations. These locators support timing and incomplete-expiration distinctions, rather than a universal fixed expiration-time rule.
Additional precise locator in the official technical statement: Equipment, Display, printed p. e74 (PDF p. 5), requires both volume-time and flow-volume real-time displays and describes their complementary information. This supports the distinction between timed-volume summaries and a complete waveform. www.aarc.org/wp-content/uploads/2026/06/ers-ats-standardization-of-spirometry.pdf
Additional precise PEF locator: Reported Values defines peak expiratory flow as the highest flow from the specified maximal forced expiratory maneuver, and Table 9 (printed p. e82) gives its spirometric reporting units as liters per second. This distinguishes a maximum flow from the timed and total expired volumes. www.aarc.org/wp-content/uploads/2026/06/ers-ats-standardization-of-spirometry.pdf