UNDERSTANDING FVC AND SVC IN
PULMONARY FUNCTION TESTS. EXAM
2025 QUESTIONS AND ANSWERS
What is considered a normal PFT result for most values? - ANS 80-100% of predicted, except
for FEV1/FVC which is 70%.
What does SVC stand for and how is it characterized? - ANS SVC stands for Slow Vital
Capacity, characterized by being slow and allowing a larger volume of air to be mobilized due to
less intrathoracic pressure.
When can SVC replace FVC in testing? - ANS SVC can replace FVC if the patient cannot
perform a good forced vital capacity.
What is the difference between FVC and SVC in terms of measurement? - ANS FVC is a forced
measurement, while SVC is a slow measurement.
What happens to intrathoracic pressure during forced expiration? - ANS Intrathoracic
pressure increases, which diminishes airflow.
What indicates obstructive disease in terms of FVC and SVC? - ANS FVC < SVC indicates
obstructive disease.
What is a common consequence of obstructive disease during forced VC? - ANS Air trapping
occurs as smaller airways collapse.
1 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
PULMONARY FUNCTION TESTS. EXAM
2025 QUESTIONS AND ANSWERS
What is considered a normal PFT result for most values? - ANS 80-100% of predicted, except
for FEV1/FVC which is 70%.
What does SVC stand for and how is it characterized? - ANS SVC stands for Slow Vital
Capacity, characterized by being slow and allowing a larger volume of air to be mobilized due to
less intrathoracic pressure.
When can SVC replace FVC in testing? - ANS SVC can replace FVC if the patient cannot
perform a good forced vital capacity.
What is the difference between FVC and SVC in terms of measurement? - ANS FVC is a forced
measurement, while SVC is a slow measurement.
What happens to intrathoracic pressure during forced expiration? - ANS Intrathoracic
pressure increases, which diminishes airflow.
What indicates obstructive disease in terms of FVC and SVC? - ANS FVC < SVC indicates
obstructive disease.
What is a common consequence of obstructive disease during forced VC? - ANS Air trapping
occurs as smaller airways collapse.
1 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
