Question 1

In which of the following situations would the DLCO be artificially increased?

Accepted Answer

A)  The measurement is performed at 1500 m above sea level. 
B)  The subject smoked 1 hour before the test. 
C)  The measurement is made with the subject in the standing position. 
D)  The subject has had his or her right lung removed. 
A)  The measurement is performed at 1500 m above sea level. 
B)  The subject smoked 1 hour before the test. 
C)  The measurement is made with the subject in the standing position. 
D)  The subject has had his or her right lung removed. A

Question 2

The following data are obtained from a 25-year-old male with an FVC of 6.50 L and an FEV1 of 3.46 L:   What should the technologist do next?

Accepted Answer

A)  Report the mean of the two trials. 
B)  Perform another trial because the values are not repeatable. 
C)  Perform another maneuver because the IVC is too low. 
D)  Report the first trial only. 
A)  Report the mean of the two trials. 
B)  Perform another trial because the values are not repeatable. 
C)  Perform another maneuver because the IVC is too low. 
D)  Report the first trial only. A

Question 3

All of the following gases may be used as a tracer gas when performing the DLCO test except:

Accepted Answer

A)  Methane 
B)  Neon 
C)  Carbon dioxide 
D)  Helium 
A)  Methane 
B)  Neon 
C)  Carbon dioxide 
D)  Helium C

Question 4

Which of the following methods does the ATS-ERS recommend to calculate breath-hold time?

Accepted Answer

A)  Epidemiology Standardization Project (ESP)method 
B)  Jones method 
C)  Ogilvie method 
D)  Three-equation method 
A)  Epidemiology Standardization Project (ESP)method 
B)  Jones method 
C)  Ogilvie method 
D)  Three-equation method

Question 5

A subject has a DLCOsb of 8.3 ml CO/min/mm Hg STPD,which is 38% of his predicted value.His calculated DL/VA ratio is 1.1.These values are most consistent with which of the following?

Accepted Answer

A)  Pulmonary emphysema 
B)  Pulmonary resection 
C)  Pulmonary fibrosis 
D)  Pulmonary edema 
A)  Pulmonary emphysema 
B)  Pulmonary resection 
C)  Pulmonary fibrosis 
D)  Pulmonary edema

Question 6

Differences in the calculation of the DLCOsb because of the timing of the breath-hold period may be minimized by:

Accepted Answer

A)  Having the subject breath hold at 80% VC 
B)  Measuring breath-hold time from the midpoint of inspiration 
C)  Having the subject inspire and expire rapidly 
D)  Limiting breath-hold time to less than 8 seconds 
A)  Having the subject breath hold at 80% VC 
B)  Measuring breath-hold time from the midpoint of inspiration 
C)  Having the subject inspire and expire rapidly 
D)  Limiting breath-hold time to less than 8 seconds

Question 7

The following data are obtained from a 40-year-old male with an FVC of 4.70 L and an FEV1 of 3.46 L:   What should the technologist do next?

Accepted Answer

A)  Report the mean of the two trials. 
B)  Perform another maneuver because the DLCO/VA is unbelievable. 
C)  Perform another maneuver because the IVC is too low. 
D)  Perform another maneuver because the VA is not repeatable. 
A)  Report the mean of the two trials. 
B)  Perform another maneuver because the DLCO/VA is unbelievable. 
C)  Perform another maneuver because the IVC is too low. 
D)  Perform another maneuver because the VA is not repeatable.

Question 8

The following data are obtained from a subject complaining of shortness of breath:   Which of the following statements would be most correct regarding the data?

Accepted Answer

A)  The data are consistent with obstructive lung disease. 
B)  The data are consistent with normal lung function. 
C)  Isolated reduction in DLCO is consistent with pulmonary vascular disease. 
D)  DLCO data should be questioned because the VA is significantly larger than the TLC. 
A)  The data are consistent with obstructive lung disease. 
B)  The data are consistent with normal lung function. 
C)  Isolated reduction in DLCO is consistent with pulmonary vascular disease. 
D)  DLCO data should be questioned because the VA is significantly larger than the TLC.

Question 9

A subject has her DLCOsb measured as 10.1 ml CO/min/mm Hg (STPD);her diffusing capacity measured by the DLCOrb is 9.1 ml CO/min/mm Hg (STPD).These findings are consistent with:

Accepted Answer

A)  Normal lung function 
B)  Normal difference in a subject with restriction 
C)  An improperly calibrated He analyzer 
D)  The inability to breath hold near TLC 
A)  Normal lung function 
B)  Normal difference in a subject with restriction 
C)  An improperly calibrated He analyzer 
D)  The inability to breath hold near TLC

Question 10

The membrane diffusion coefficient (resistance to diffusion by the alveolo-capillary membrane)is estimated by:

Accepted Answer

A)  The DLCOss method 
B)  Dividing the DLCO by the PaO2 
C)  Performing the DLCOsb at two different levels of PAO2 
D)  Subtracting FACOT1 from FACOT2 obtained from the DLCOrb 
A)  The DLCOss method 
B)  Dividing the DLCO by the PaO2 
C)  Performing the DLCOsb at two different levels of PAO2 
D)  Subtracting FACOT1 from FACOT2 obtained from the DLCOrb

Question 11

The following data are obtained from a 19-year-old female subject complaining of shortness of breath:   Which of the following interpretations is most consistent with the data?

Accepted Answer

A)  Mixed pattern 
B)  Obstruction 
C)  Restriction 
D)  Fixed obstruction 
A)  Mixed pattern 
B)  Obstruction 
C)  Restriction 
D)  Fixed obstruction

Question 12

Which of the following determines the fractional concentration of CO after 10 seconds of breath holding (FACOT)?

Accepted Answer

A)  (FAHe/FIHe)$\times$ FICO 
B)  Volume inspired divided by FAHe/FIHe 
C)  Estimation of the ratio FICO/FAHe 
D)  Measurement of CO from an alveolar sample 
A)  (FAHe/FIHe)$\times$ FICO 
B)  Volume inspired divided by FAHe/FIHe 
C)  Estimation of the ratio FICO/FAHe 
D)  Measurement of CO from an alveolar sample

Question 13

Which of the following is an advantage of continuous analysis of expired gas during a DLCOsb test?

Accepted Answer

A)  Instrument dead space is eliminated. 
B)  Exhaled gas concentrations can be visually inspected. 
C)  CO back pressure is reduced. 
D)  Breath-hold times longer than 12 seconds are acceptable. 
A)  Instrument dead space is eliminated. 
B)  Exhaled gas concentrations can be visually inspected. 
C)  CO back pressure is reduced. 
D)  Breath-hold times longer than 12 seconds are acceptable.

Question 14

A subject has a DLCOsb of 10.2 ml CO/min/mm Hg (STPD),which is 51% of her predicted value.Her DL/VA ratio is 4.1.Which of the following diagnoses is most consistent with these values?

Accepted Answer

A)  Pulmonary emphysema 
B)  Pulmonary resection 
C)  Cystic fibrosis 
D)  COHb of 5.5% 
A)  Pulmonary emphysema 
B)  Pulmonary resection 
C)  Cystic fibrosis 
D)  COHb of 5.5%

Question 15

A nonsmoking subject performs two DLCOsb maneuvers,and the following results are obtained: Test 1 24.3 ml CO/min/mm Hg
Test 2 18.7 ml CO/min/mm Hg
Which of the following is appropriate?

Accepted Answer

A)  Reporting the largest value as the DLCO 
B)  Reporting the average of the two values 
C)  Performing an additional maneuver 
D)  Correcting the value from Test 2 for COHb 
A)  Reporting the largest value as the DLCO 
B)  Reporting the average of the two values 
C)  Performing an additional maneuver 
D)  Correcting the value from Test 2 for COHb

Question 16

Compared with oxygen,how much more readily does carbon monoxide combine with hemoglobin?

Accepted Answer

A)  210 times 
B)  150 times 
C)  175 times 
D)  240 times 
A)  210 times 
B)  150 times 
C)  175 times 
D)  240 times

Question 17

According to the 2005 ATS-ERS guidelines for diffusing capacity,what is the recommended breath-hold time?

Accepted Answer

A)  9-11 seconds 
B)  8-12 seconds 
C)  10 seconds $\pm$ 1 second 
D)  10 seconds 
A)  9-11 seconds 
B)  8-12 seconds 
C)  10 seconds $\pm$ 1 second 
D)  10 seconds

Question 18

The Jones method of timing the breath hold for DLCOsb measures the interval from _____ of alveolar sampling.

Accepted Answer

A)  Beginning of inspiration to beginning 
B)  0.3 units of inspiratory time to the middle 
C)  0.5 units of inspiratory time to the middle 
D)  Beginning of breath hold to the end 
A)  Beginning of inspiration to beginning 
B)  0.3 units of inspiratory time to the middle 
C)  0.5 units of inspiratory time to the middle 
D)  Beginning of breath hold to the end

Question 19

If the He and CO analyzers used for a DLCOsb test are linear with respect to each other,the fractional concentration of CO at the beginning of the breath hold (FACO0)is equal to:

Accepted Answer

A)  FAHe 
B)  FAHe/FIHe 
C)  FICO 
D)  logn FIHe 
A)  FAHe 
B)  FAHe/FIHe 
C)  FICO 
D)  logn FIHe

Question 20

In what units is DLCO/VA reported?

Accepted Answer

A)  ATPS 
B)  STPD 
C)  BTPS 
D)  None of the above 
A)  ATPS 
B)  STPD 
C)  BTPS 
D)  None of the above

In which of the following situations would the DLCO be artificially increased?

The following data are obtained from a 25-year-old male with an FVC of 6.50 L and an FEV₁ of 3.46 L: What should the technologist do next?

All of the following gases may be used as a tracer gas when performing the DLCO test except:

Which of the following methods does the ATS-ERS recommend to calculate breath-hold time?

A subject has a DLCOsb of 8.3 ml CO/min/mm Hg STPD,which is 38% of his predicted value.His calculated D_L/V_A ratio is 1.1.These values are most consistent with which of the following?

Differences in the calculation of the DLCOsb because of the timing of the breath-hold period may be minimized by:

The following data are obtained from a 40-year-old male with an FVC of 4.70 L and an FEV₁ of 3.46 L: What should the technologist do next?

The following data are obtained from a subject complaining of shortness of breath: Which of the following statements would be most correct regarding the data?

A subject has her DLCOsb measured as 10.1 ml CO/min/mm Hg (STPD);her diffusing capacity measured by the DLCOrb is 9.1 ml CO/min/mm Hg (STPD).These findings are consistent with:

The membrane diffusion coefficient (resistance to diffusion by the alveolo-capillary membrane)is estimated by:

The following data are obtained from a 19-year-old female subject complaining of shortness of breath: Which of the following interpretations is most consistent with the data?

Which of the following determines the fractional concentration of CO after 10 seconds of breath holding (F_ACO_T)?

Which of the following is an advantage of continuous analysis of expired gas during a DLCOsb test?

A subject has a DLCOsb of 10.2 ml CO/min/mm Hg (STPD),which is 51% of her predicted value.Her D_L/V_A ratio is 4.1.Which of the following diagnoses is most consistent with these values?

A nonsmoking subject performs two DLCOsb maneuvers,and the following results are obtained: Test 1 24.3 ml CO/min/mm Hg Test 2 18.7 ml CO/min/mm Hg Which of the following is appropriate?

Compared with oxygen,how much more readily does carbon monoxide combine with hemoglobin?

According to the 2005 ATS-ERS guidelines for diffusing capacity,what is the recommended breath-hold time?

The Jones method of timing the breath hold for DLCOsb measures the interval from _____ of alveolar sampling.

If the He and CO analyzers used for a DLCOsb test are linear with respect to each other,the fractional concentration of CO at the beginning of the breath hold (F_ACO₀)is equal to:

In what units is DLCO/V_A reported?

Indications for Pulmonary Function Testing

Spirometry

Lung Volumes,airway Resistance,and Gas Distribution Tests

Ventilation and Ventilatory Control Tests

Blood Gases and Related Tests

Cardiopulmonary Exercise Testing

Pediatric Pulmonary Function Tests

Bronchoprovocation Testing

Specialized Test Regimens

Pulmonary Function Test Equipment

Quality Systems in the Pulmonary Function Laboratory

Reference Values and Interpretation Strategies

Filters

Exam 3: Diffusing Capacity Tests

In which of the following situations would the DLCO be artificially increased?

The following data are obtained from a 25-year-old male with an FVC of 6.50 L and an FEV1 of 3.46 L: What should the technologist do next?

All of the following gases may be used as a tracer gas when performing the DLCO test except:

Which of the following methods does the ATS-ERS recommend to calculate breath-hold time?

A subject has a DLCOsb of 8.3 ml CO/min/mm Hg STPD,which is 38% of his predicted value.His calculated DL/VA ratio is 1.1.These values are most consistent with which of the following?

Differences in the calculation of the DLCOsb because of the timing of the breath-hold period may be minimized by:

The following data are obtained from a 40-year-old male with an FVC of 4.70 L and an FEV1 of 3.46 L: What should the technologist do next?

The following data are obtained from a subject complaining of shortness of breath: Which of the following statements would be most correct regarding the data?

A subject has her DLCOsb measured as 10.1 ml CO/min/mm Hg (STPD);her diffusing capacity measured by the DLCOrb is 9.1 ml CO/min/mm Hg (STPD).These findings are consistent with:

The membrane diffusion coefficient (resistance to diffusion by the alveolo-capillary membrane)is estimated by:

The following data are obtained from a 19-year-old female subject complaining of shortness of breath: Which of the following interpretations is most consistent with the data?

Which of the following determines the fractional concentration of CO after 10 seconds of breath holding (FACOT)?

Which of the following is an advantage of continuous analysis of expired gas during a DLCOsb test?

A subject has a DLCOsb of 10.2 ml CO/min/mm Hg (STPD),which is 51% of her predicted value.Her DL/VA ratio is 4.1.Which of the following diagnoses is most consistent with these values?

A nonsmoking subject performs two DLCOsb maneuvers,and the following results are obtained: Test 1 24.3 ml CO/min/mm Hg Test 2 18.7 ml CO/min/mm Hg Which of the following is appropriate?

Compared with oxygen,how much more readily does carbon monoxide combine with hemoglobin?

According to the 2005 ATS-ERS guidelines for diffusing capacity,what is the recommended breath-hold time?

The Jones method of timing the breath hold for DLCOsb measures the interval from _____ of alveolar sampling.

If the He and CO analyzers used for a DLCOsb test are linear with respect to each other,the fractional concentration of CO at the beginning of the breath hold (FACO0)is equal to:

In what units is DLCO/VA reported?

Indications for Pulmonary Function Testing

Spirometry

Lung Volumes,airway Resistance,and Gas Distribution Tests

Ventilation and Ventilatory Control Tests

Blood Gases and Related Tests

Cardiopulmonary Exercise Testing

Pediatric Pulmonary Function Tests

Bronchoprovocation Testing

Specialized Test Regimens

Pulmonary Function Test Equipment

Quality Systems in the Pulmonary Function Laboratory

Reference Values and Interpretation Strategies

Filters

The following data are obtained from a 25-year-old male with an FVC of 6.50 L and an FEV₁ of 3.46 L: What should the technologist do next?

A subject has a DLCOsb of 8.3 ml CO/min/mm Hg STPD,which is 38% of his predicted value.His calculated D_L/V_A ratio is 1.1.These values are most consistent with which of the following?

The following data are obtained from a 40-year-old male with an FVC of 4.70 L and an FEV₁ of 3.46 L: What should the technologist do next?

Which of the following determines the fractional concentration of CO after 10 seconds of breath holding (F_ACO_T)?

A subject has a DLCOsb of 10.2 ml CO/min/mm Hg (STPD),which is 51% of her predicted value.Her D_L/V_A ratio is 4.1.Which of the following diagnoses is most consistent with these values?

If the He and CO analyzers used for a DLCOsb test are linear with respect to each other,the fractional concentration of CO at the beginning of the breath hold (F_ACO₀)is equal to:

In what units is DLCO/V_A reported?