This report provides standardized guidelines for lung function tests, focusing on lung volumes and forced ventilatory flows. It outlines the definitions, indices, and methods for measuring static and dynamic lung volumes, as well as forced expiration and inspiration flows. The report emphasizes the importance of standardized measurement conditions, equipment, and procedures to ensure accurate and reproducible results. Key indices include vital capacity (VC), forced vital capacity (FVC), forced expiratory volume in one second (FEV1), and maximal expiratory flow (PEF). The report also discusses the clinical applications of these tests, such as diagnosing lung diseases, monitoring treatment effectiveness, and assessing respiratory health. It highlights the differences between restrictive and obstructive ventilatory defects and the importance of using appropriate reference values for interpretation. The report recommends using the inspiratory vital capacity (IVC) for most measurements, as it provides more accurate results than the forced vital capacity (FVC) in certain cases. It also addresses the challenges of measuring lung volumes in patients with conditions such as emphysema, asthma, and cystic fibrosis, and emphasizes the need for proper calibration and standardization of equipment to ensure reliable results. The report concludes with recommendations for measuring lung volumes and flows, including the use of spirometry, pneumotachometry, and gas dilution methods, as well as the importance of considering environmental factors and patient-specific variables in the interpretation of results.This report provides standardized guidelines for lung function tests, focusing on lung volumes and forced ventilatory flows. It outlines the definitions, indices, and methods for measuring static and dynamic lung volumes, as well as forced expiration and inspiration flows. The report emphasizes the importance of standardized measurement conditions, equipment, and procedures to ensure accurate and reproducible results. Key indices include vital capacity (VC), forced vital capacity (FVC), forced expiratory volume in one second (FEV1), and maximal expiratory flow (PEF). The report also discusses the clinical applications of these tests, such as diagnosing lung diseases, monitoring treatment effectiveness, and assessing respiratory health. It highlights the differences between restrictive and obstructive ventilatory defects and the importance of using appropriate reference values for interpretation. The report recommends using the inspiratory vital capacity (IVC) for most measurements, as it provides more accurate results than the forced vital capacity (FVC) in certain cases. It also addresses the challenges of measuring lung volumes in patients with conditions such as emphysema, asthma, and cystic fibrosis, and emphasizes the need for proper calibration and standardization of equipment to ensure reliable results. The report concludes with recommendations for measuring lung volumes and flows, including the use of spirometry, pneumotachometry, and gas dilution methods, as well as the importance of considering environmental factors and patient-specific variables in the interpretation of results.