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FEV is a crucial measurement in pulmonary function testing that quantifies the volume of air a person can forcibly exhale within a specific timeframe following maximal inhalation. This measurement is crucial for diagnosing and monitoring respiratory conditions such as asthma, COPD, and other obstructive or restrictive lung diseases. FEV1, combined with FVC, is the most commonly used parameter for identifying airway obstruction. FEV1 is also a reliable indicator of disease severity and is used to monitor patients with COPD and asthma. However, comparing FEV1 to predicted values based on age, gender, height, and ethnicity is no longer recommended. All spirometry values currently use the fifth percentile as the LLN, corresponding to a Z-score of −1.645 or lower, to eliminate age, sex, and height bias and support tailored management strategies.[20] in addition, race-neutral formulas are recommended for calculating predicted spirometry values to reduce racial bias in healthcare. Accurate spirometry depends on good patient effort, proper inhalation, and the ability to follow instructions, as decreased effort can result in misdiagnosis and inappropriate treatment. In obstructive diseases, FEV1 is disproportionately reduced compared to FVC, leading to a low FEV1/FVC with a Z-score of −1.645 or lower. In restrictive disorders, both FEV1 and FVC are reduced, causing FEV1/FVC to remain normal or elevated. Some experts suggest using the FEV1/FEV6 instead of FEV1/FVC, as FEV6 offers greater accuracy, lower physical demands, and improved reproducibility. The FEV1 response to inhaled bronchodilators can help assess the reversibility of airway obstruction. However, clinicians should be aware that a lack of significant improvement in FEV1 does not necessarily indicate that the patient will not benefit from bronchodilator therapy. Clinicians should consider changes in other values, such as IC and VC. Understanding and utilizing FEV measurements are fundamental in delivering effective respiratory care and improving patient outcomes.

The FEV1 response to inhaled bronchodilators can help assess the reversibility of airway obstruction. However, clinicians should be aware that a lack of significant improvement in FEV1 does not necessarily indicate that the patient will not benefit from bronchodilator therapy. Clinicians should consider changes in other values, such as IC and VC. Understanding and utilizing FEV measurements are fundamental in delivering effective respiratory care and improving patient outcomes. Enhancing patient-centered care, outcomes, safety, and team performance related to FEV measurement requires a multidisciplinary approach involving physicians, advanced practitioners, nurses, pharmacists, and other healthcare professionals. Physicians and advanced practitioners must be proficient in conducting and interpreting spirometry tests, especially FEV1 and FVC, to effectively diagnose and monitor respiratory conditions such as asthma and COPD. Healthcare team members must collaborate to prepare patients for spirometry, ensure accurate technique, and educate them on the importance of these tests and proper inhaler use. Adhering to standardized spirometry protocols and participating in quality improvement initiatives are essential for enhancing accuracy and effectiveness. Effective interprofessional communication is crucial and can be improved through meticulous documentation and timely sharing of specialist input and test results. Collaborative care planning and patient education are essential strategies, enabling all healthcare team members to work together in creating and adjusting treatment plans based on spirometry results and patient responses. By integrating these skills, strategies, and communication practices, healthcare teams can significantly enhance patient-centered care, safety, and outcomes in managing respiratory conditions through FEV measurements.