Spirometry Lab — Lung Volumes & Capacities

Part 1Read & Calculate: TV, ERV, and VC

Use the graph to identify three key volume levels. Hover over the traces and click to lock a reading. Enter the values below — the calculations update automatically.

Highest volume reached during quiet (tidal) breathing

L

Lowest volume during quiet (tidal) breathing — the resting baseline

L

Maximum volume reached during Maneuver A (maximal inhalation)

L

Calculations

TV = ? − ? = — L

ERV = ? − 1.2 (RV, given) = — L

VC = ? − 1.2 (RV, given) = — L

Part 2Set Up Equations: IRV, IC, FRC, and TLC

For each capacity, choose which variables belong in the equation using the dropdowns. Click the operator button between terms to toggle between + and −.

Inspiratory Reserve Volume

IRV

=

Term 1

Term 2

Term 3

Inspiratory Capacity

IC

=

Term 1

Term 2

Functional Residual Capacity

FRC

=

Term 1

Term 2

Total Lung Capacity

TLC

=

Term 1

Term 2

Part 3Calculate the Capacities

Your equations from Part 2 have been filled in with the values you measured in Part 1. Review the results.

IRV——L

IC — —L

FRC——L

TLC——L

Part 4Label the Spirometry Graph

Type the correct abbreviation into each box on the graph — volume bands on the left, capacity spans on the right. When you've filled everything in, click Check Labels.