USMC PHYSICAL FITNESS TEST ACTUAL
EXAMINATION 2026 QUESTIONS WITH
SOLUTIONS GRADED A+
⩥lung volume tests. Answer: -Helium dilution
-Nitrogen washout
-Body Plethysmography
⩥lung volume tests are. Answer: indirectly measuring lung volumes
⩥values that cannot be directly measured (measured in lung volume
tests). Answer: -Residual volume
-Functional residual capacity
-Total lung capacity
⩥you can use FRC (from LVT) and VC (from spirometry) to calculate.
Answer: TLC
⩥helium dilution is a. Answer: closed circuit test
⩥helium dilution test measures. Answer: FRC
,⩥what gas does helium dilution test use. Answer: 10% helium
⩥during helium dilution test, patient breathes. Answer: through a closed
circuit system for 2-10 minutes
⩥the lungs act as a mixing chamber. Answer: for helium and air that is
already present
⩥the change in concentration of helium is used. Answer: to measure
FRC
⩥step 1 of helium dilution. Answer: spirometer is filled with a known
volume of air
⩥step 2 of helium dilution. Answer: helium is added to a concentration
of 10%
⩥step 3 of helium dilution. Answer: the exact gas % and volume are
measured at the beginning of test
⩥step 4 of helium dilution. Answer: the patient begins to breathe room
air and at the end of a normal Vt (FRC) a valve opens (test begins here)
, ⩥step 5 of helium dilution. Answer: patient breathes and rebreathes the
helium and air mixture
⩥step 6 of helium dilution. Answer: helium concentration decreases
until the helium falls to a stable level
⩥when stable level of helium is acheived. Answer: the test is over
⩥advantages of helium dilution. Answer: -easy for pt to perform
-simple and inexpensive
⩥disadvantages of helium dilution. Answer: -not as accurate as body
box
-time consuming (2-10 min test with 5 min wait between each)
⩥you should perform a minimum of (HD). Answer: 2 tests whose results
are within 10% of each other
⩥in helium dilution test the FRC may be. Answer: underestimated in
patients with severe obstruction
⩥equation for determining FRC (HD). Answer: FRC= %He initial- %He
final/%He final X system volume
EXAMINATION 2026 QUESTIONS WITH
SOLUTIONS GRADED A+
⩥lung volume tests. Answer: -Helium dilution
-Nitrogen washout
-Body Plethysmography
⩥lung volume tests are. Answer: indirectly measuring lung volumes
⩥values that cannot be directly measured (measured in lung volume
tests). Answer: -Residual volume
-Functional residual capacity
-Total lung capacity
⩥you can use FRC (from LVT) and VC (from spirometry) to calculate.
Answer: TLC
⩥helium dilution is a. Answer: closed circuit test
⩥helium dilution test measures. Answer: FRC
,⩥what gas does helium dilution test use. Answer: 10% helium
⩥during helium dilution test, patient breathes. Answer: through a closed
circuit system for 2-10 minutes
⩥the lungs act as a mixing chamber. Answer: for helium and air that is
already present
⩥the change in concentration of helium is used. Answer: to measure
FRC
⩥step 1 of helium dilution. Answer: spirometer is filled with a known
volume of air
⩥step 2 of helium dilution. Answer: helium is added to a concentration
of 10%
⩥step 3 of helium dilution. Answer: the exact gas % and volume are
measured at the beginning of test
⩥step 4 of helium dilution. Answer: the patient begins to breathe room
air and at the end of a normal Vt (FRC) a valve opens (test begins here)
, ⩥step 5 of helium dilution. Answer: patient breathes and rebreathes the
helium and air mixture
⩥step 6 of helium dilution. Answer: helium concentration decreases
until the helium falls to a stable level
⩥when stable level of helium is acheived. Answer: the test is over
⩥advantages of helium dilution. Answer: -easy for pt to perform
-simple and inexpensive
⩥disadvantages of helium dilution. Answer: -not as accurate as body
box
-time consuming (2-10 min test with 5 min wait between each)
⩥you should perform a minimum of (HD). Answer: 2 tests whose results
are within 10% of each other
⩥in helium dilution test the FRC may be. Answer: underestimated in
patients with severe obstruction
⩥equation for determining FRC (HD). Answer: FRC= %He initial- %He
final/%He final X system volume
