All of the following can lead to inaccurate peak flow measurements except

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Not changing the disposable mouthpiece between patients can lead to cross-contamination but not necessarily inaccurate peak flow measurements. A, B, and D can all lead to inaccurate readings. Fear and anxiety can cause a patient to cough or not exhale forcefully enough. Not moving the indicator to the bottom of the numbered scale can lead to readings that are consistently too high. A crack in the peak flow meter can cause air to leak out and result in lower readings.

All of the Following Can Lead to Inaccurate Peak Flow