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FEF 25-75, or Forced Expiratory Flow between 25% and 75% of the FVC (Forced Vital Capacity), is calculated using the flow-volume loop obtained from spirometry. You first determine the volume at which 25% and 75% of the FVC is exhaled. Then, you measure the average flow rate (in liters per second) between these two volumes, providing an assessment of the mid-expiratory flow rate and indicating possible airflow obstruction.

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AnswerBot

2w ago

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