Per ATS/ERS 2017 DLCO standards, what is the approximate carbon monoxide (CO) concentration in the standard test gas mixture?
Cpft Instrumentation Equipment
Question · Medium
Which precautions?
Short
Which gas is typically used as the "zero" gas when calibrating gas analyzers for diffusing capacity measurements?
Chapter 1: Overview & NBRC Certification Requirements
1.1 NBRC PFT Exam Logistics, Format, and Scoring Criteria
Study guide
How often should volume-type spirometers be leak-tested according to ATS/ERS standards?
Question · Easy
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A body plethysmograph must be capable of measuring thoracic gas volume (TGV) to within what accuracy?
When performing a 3-liter syringe calibration check on a spirometer, how many strokes should be performed?
A spirometer consistently reads 4.85 liters when a 5.00-liter calibration syringe is used. What should be the technologist's first action?
1.2 Scope of Practice, Candidate Admission Pathways, and Credential Maintenance
What is the maximum acceptable barometric pressure variation between calibration and patient testing for most pulmonary function equipment?
During routine quality control, a pneumotachometer-based spirometer shows increasing resistance. What is the most likely cause?
Which of the following is an acceptable biological control procedure for spirometry?
A gas analyzer for DLCO testing shows drift in the baseline reading over time. What is the most appropriate immediate action?
1.3 Professional Standards, Ethics, and Patient Safety in Diagnostic Testing
What is the recommended method for cleaning reusable mouthpieces and tubing between patients?
When performing spirometry on a patient with suspected tuberculosis, which additional precaution is required?
What is the primary hazard associated with using helium for lung volume measurements?
How should inline filters be positioned when using a filter for spirometry?
Chapter 2: Spirometry Equipment & Sensors
2.1 Volume-Displacement Spirometers: Water-Seal, Rolling-Seal, Bellows
Which of the following is a contraindication to body plethysmography?
According to ATS/ERS standards, what is the minimum acceptable exhalation time for spirometry in adults?
Cpft Procedures
How many acceptable spirometry maneuvers are required to meet ATS/ERS standards?
What is the maximum acceptable pause time between inhalation and exhalation during spirometry?
2.2 Flow-Sensing Pneumotachometers: Fleisch, Lilly, Vortex, Turbine, Pitot Tube, Ultrasonic
A patient performs spirometry but coughs during the first second of exhalation. How should this maneuver be graded?
When coaching a patient for spirometry, when should the technologist say "BLAST OUT FAST"?
What minimum FVC value indicates a valid spirometry effort in an adult patient?
When performing pre- and post-bronchodilator spirometry, what is the minimum waiting period after administering a short-acting bronchodilator?
2.3 Calibration Standards & 3-Liter Syringe Quality Control Verification
What change in FEV1 is considered a significant bronchodilator response?
Which of the following is a relative contraindication to spirometry per ATS/ERS 2019?
During spirometry, a patient's flow-volume curve shows a "scooped" or concave appearance. What does this indicate?
What is the minimum breathing time required for the helium dilution technique to reach equilibration in most patients?
Chapter 3: Body Plethysmography & Hardware
3.1 Body Plethysmograph Principles: Pressure, Volume, and Variable-Pressure-Constant-Volume Design
In body plethysmography, what maneuver does the patient perform during the panting phase?
What is the recommended breath-hold time during the single-breath DLCO maneuver?
What is the minimum acceptable inspired volume during single-breath DLCO testing?
How many acceptable DLCO measurements are required for a valid test?
3.2 Plethysmograph Calibration, Pressure Transducers, and Shutter Mechanics
What factor is used to correct DLCO measurements for hemoglobin levels?
Question · Hard
During nitrogen washout testing for lung volumes, what is the target nitrogen concentration at the end of the test?
What is the primary advantage of body plethysmography over gas dilution methods for measuring lung volumes?
What is the purpose of the alveolar sample in single-breath DLCO testing?
3.3 Quality Control, Isothermal Corrections, and Leak Detection in Plethysmography
When performing bronchial provocation testing with methacholine, what is the starting concentration typically used?
What is the primary purpose of maximal inspiratory pressure (MIP) testing?
In the 6-minute walk test, what is the minimum clinically important difference in walking distance?
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