Which spirometry results indicate a normal range?

The correct answer identifies a comprehensive set of classifications for spirometry results, where "Normal" indicates that lung function is within the expected range. In the context of pulmonary function testing, a normal result reflects the ability of the lungs to effectively exchange air without obstruction or restriction.

When interpreting spirometry, the terms "Restrictive," "Obstructive," and "Mixed" refer to different types of pulmonary conditions. "Restrictive" indicates a reduction in lung volume, typically due to issues such as pulmonary fibrosis, while "Obstructive" refers to conditions that impede airflow, such as asthma or chronic obstructive pulmonary disease (COPD). "Mixed" encompasses points where features of both obstructive and restrictive defects are present.

The inclusion of "Normal" in this context confirms that in a functional assessment of the lungs, the absence of pathology is acknowledged alongside other potential results. This categorization is crucial for clinicians to understand the various conditions affecting respiratory health, and it allows for proper diagnosis and management strategies for diverse respiratory issues.

Other options provide combinations of terms that do not accurately represent standard spirometry interpretations, particularly in terms related to abnormal pulmonary function classifications or using terminology that may not universally define the conditions assessed in pulmonary function tests.