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Respiratory Therapist

Category - Patient Evaluations and Recommendations

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Select all the following that are correct formulas to follow for capacities:

TLC = IC + FRC
FRC = TLC + ERV
TLC = IRV + IRV + FRC
VC = IC + ERV

Explanation

Answers: A, C and D - Correct formulas to use in calculating lung capacities are:
IC + FRC = TLC
IRV + IRV + FRC = TLC
IC + ERV = VC

The correct way to calculate the FRC is [ERV + RV] or [TLC - IC].
For example, FRV 2500 + ERV 1000 = FRC of 3600.

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