What is the primary purpose of a peak flow meter?

A peak flow meter is primarily utilized to monitor lung function in asthma patients. It provides a quantitative measure of how well air can be expelled from the lungs, which is crucial for individuals with asthma as it helps in assessing their current respiratory status and detecting early signs of an asthma exacerbation.

The readings obtained from a peak flow meter reflect the peak expiratory flow rate (PEFR), which can indicate changes in lung function. By regularly monitoring peak flow, patients and their healthcare providers can make informed decisions about treatment adjustments, medication use, and when to seek medical attention, thereby improving overall asthma management.

The other choices focus on different aspects of respiratory assessment. Assessing blood oxygen levels usually involves pulse oximetry or arterial blood gases, and measuring respiratory rate is typically done through direct observation or monitoring devices. Evaluating carbon dioxide levels is usually performed through blood gas analysis or capnography, making the peak flow meter distinctly tailored for monitoring the airflow in asthma management.