PFT Module 1 Exam Questions (60) – Spirometry Basics, Lung Volumes, DLCO | RESP 310 Pulmonary Diagnostics

This document contains 60 exam-style questions with verified answers designed to help students prepare for Module 1 of a Pulmonary Function Testing (PFT) course. The study material focuses on basic pulmonary physiology, spirometry measurements, lung volumes and capacities, obstructive versus restrictive lung disease interpretation, and diffusion capacity testing (DLCO). The questions are organized in a structured question-and-answer format to help reinforce key respiratory diagnostic principles commonly tested in respiratory therapy and cardiopulmonary science coursework. The study guide begins with the purpose and clinical applications of pulmonary function testing. Pulmonary Function Tests are performed to determine the functional status of the lungs, including gas exchange efficiency, lung stiffness, and the patient’s response to therapeutic interventions. Before conducting a PFT, the patient must be clinically stable and not in need of acute treatment, ensuring the results accurately reflect baseline pulmonary function rather than an acute respiratory crisis (page 1). Another section explains common clinical uses of pulmonary function testing, including evaluating pulmonary causes of dyspnea, differentiating between obstructive and restrictive lung disorders, and assessing the severity of respiratory impairment. Predicted lung values are calculated using patient characteristics such as height, weight, age, sex, smoking history, and medical condition, with height being the most significant predictor because taller individuals generally have larger lung volumes (page 2). The document also introduces key pulmonary diagnostic equipment, including the body plethysmograph, which measures lung volumes such as total lung capacity (TLC) and airway resistance. These measurements are particularly useful for diagnosing restrictive lung disease and evaluating airway obstruction that cannot be fully assessed with basic spirometry alone (page 2). Another section focuses on obstructive versus restrictive pulmonary disorders. Obstructive defects occur when airflow is impeded, producing characteristic symptoms such as dyspnea, wheezing, hypoxemia, hypercapnia, and tachypnea. Restrictive disorders, on the other hand, are characterized by reduced lung volumes on spirometry and other volume studies, often caused by chest wall abnormalities or neurologic diseases affecting respiratory muscles (pages 2–3). The study guide also explains fundamental lung volume measurements used in pulmonary diagnostics. Vital Capacity (VC) is defined as the maximum amount of air a person can exhale after a full inhalation, and reductions in VC can indicate impaired respiratory function or increased risk for postoperative complications. Residual Volume (RV) represents the gas remaining in the lungs after maximal exhalation, which is essential for calculating Total Lung Capacity (TLC) (pages 3–4). Another section reviews functional lung volumes and their clinical interpretation. Functional Residual Capacity (FRC) represents the resting lung volume at the end of a normal tidal breath, balancing the outward forces of the chest wall with the inward recoil of lung tissue. Expiratory Reserve Volume (ERV) refers to the additional air that can be exhaled after a normal expiration and is commonly reduced in obesity, poor patient effort, and restrictive lung disease (page 5). The guide also discusses key spirometry parameters used to diagnose airway obstruction, particularly Forced Expiratory Volume in one second (FEV1) and the FEV1/FVC ratio. FEV1 is considered one of the best indicators of obstructive disease because it reflects airflow through the larger airways. In obstructive disorders such as asthma or chronic obstructive pulmonary disease (COPD), the FEV1/FVC ratio is decreased, whereas the ratio is usually normal in purely restrictive disorders (page 6). Another topic covered is Maximal Voluntary Ventilation (MVV), which measures the patient’s ability to breathe rapidly and deeply over a short period (typically 12–15 seconds). This test evaluates respiratory muscle strength and ventilatory capacity, helping clinicians identify neuromuscular weakness or ventilatory limitations (page 6). The study guide also introduces flow-volume loop interpretation, which visually displays inspiratory and expiratory airflow patterns. In these graphs, expiratory flow appears above the horizontal axis while inspiratory flow appears below, helping clinicians identify patterns of airway obstruction or restriction based on the shape and size of the loop (page 6). Another section focuses on diffusion capacity testing (DLCO), which measures the ability of gases to move from the alveoli into pulmonary capillary blood. Carbon monoxide is used during this test because it has a high affinity for hemoglobin, making it ideal for evaluating gas diffusion across the alveolar-capillary membrane. A typical normal DLCO value is approximately 25 mL CO/min/mmHg (page 7). The guide also discusses bronchial challenge testing, which evaluates airway hyperreactivity when baseline spirometry results are normal. Common bronchial provocation agents include methacholine, histamine, exercise, cold air exposure, and inhaled mannitol, all of which can trigger bronchoconstriction in patients with reactive airway disease such as asthma (page 8). This study resource may be relevant for courses such as: Pulmonary Function Testing Respiratory Therapy Fundamentals Cardiopulmonary Physiology Respiratory Diagnostics Laboratory Clinical Respiratory Care Students enrolled in the following programs may benefit from this document: Respiratory Therapy (CRT / RRT) Programs Cardiopulmonary Science Programs Clinical Physiology Programs Nursing and Allied Health Programs Pulmonary Diagnostics Training Programs Example course codes commonly associated with these subjects include: RESP 310 – Pulmonary Function Testing RESP 300 – Respiratory Therapy Fundamentals RSPT 220 – Cardiopulmonary Physiology MLS 315 – Clinical Pulmonary Diagnostics BIOMED 330 – Cardiopulmonary Laboratory Methods The concepts covered in this document align closely with foundational respiratory therapy textbooks such as Egan’s Fundamentals of Respiratory Care by Robert M. Kacmarek, James K. Stoller, and Albert J. Heuer and Pulmonary Function Testing and Cardiopulmonary Stress Testing by Jack Wanger. These textbooks provide the theoretical framework for spirometry interpretation, lung volume measurements, diffusion capacity testing, and bronchial challenge procedures reflected in this exam preparation guide. Overall, this document serves as a focused Module 1 Pulmonary Function Testing study resource, helping respiratory therapy students review core pulmonary physiology concepts, spirometry interpretation techniques, and diagnostic testing principles necessary for academic exams and respiratory care certification preparation. 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