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The client is being taught how to use a peak flow meter. The nurse explains that this device should be used to:

  • A. Determine oxygen saturation
  • B. Measure forced expiratory volume
  • C. Monitor the atmosphere for the presence of allergens
  • D. Provide metered doses for inhaled bronchodilator
Correct Answer: B

Rationale: A peak flow meter is used to measure forced expiratory volume, which helps in monitoring asthma. This measurement provides valuable information about how well the client's lungs are functioning and how narrow their airways are. Choice A is incorrect because determining oxygen saturation is typically done using a pulse oximeter. Choice C is incorrect as a peak flow meter is not used to monitor the atmosphere for allergens but rather to assess lung function. Choice D is incorrect as providing metered doses for inhaled bronchodilators is the function of a metered-dose inhaler, not a peak flow meter.