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A successful spirometry maneuver is characterized by a fast and steady flow with no variability. This indicates that the patient was able to take a deep breath in fully and then exhale forcefully and completely without interruption or change in airflow. Consistent and stable airflow readings are critical for accurate measurement of lung function, as they reflect the patient's ability to perform the test properly.

In contrast, inconsistent airflow, sudden halting of breath, or prolonged coughing after the test suggest issues with the test administration or the patient's ability to perform the maneuver effectively. These factors could lead to flawed or inaccurate results, thus misguiding the clinician in evaluating the patient's respiratory condition. Therefore, the presence of a fast and steady flow with no variability is a strong indicator of a successful spirometry test.