TLC Components — FRCA Primary MCQ

Instant feedback + full explanation. One question, done properly.

EasyPhysiology - RespiratoryTLC ComponentsFRCA Primary

Regarding lung volumes total lung capacity (TLC) is the sum of:

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: B — TV + IRV + ERV + RV

TLC = TV + IRV + ERV + RV = VC + RV = IC + FRC. Normal TLC in a 70 kg adult male is approximately 6 L. TLC cannot be measured by spirometry because it includes RV (which requires helium dilution / nitrogen washout / or body plethysmography to measure).

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist