Certified Pulmonary Function Technologist (CPFT) Practice Exam 2026 - Free CPFT Practice Questions and Study Guide

A high peak expiratory flow (PEF) reading is indicative of a person's overall pulmonary function being within normal ranges or under good control of their asthma. When asthma is well-managed, individuals demonstrate better airway status, leading to higher airflow rates during expiration.

In this context, option B is correct because it signifies that the individual is not experiencing any significant obstruction in their airways, allowing for optimal lung function and thus a high PEF reading. Additionally, good asthma control implies that the patient's bronchodilation mechanisms are functioning properly, which contributes to higher values in PEF measurements.

During a severe asthma attack, you would expect PEF readings to be low due to significant airway constriction and inflammation, which restricts airflow. In a pulmonary function test, while they can measure PEF, the outcome can vary depending on the patient's condition at the time of testing and may not necessarily reflect a high reading. Sleep can also affect PEF readings, but typically, PEF is highest when a person is awake and actively using their lungs effectively.