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Inspiratory capacity (IC)

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025

Definition

Inspiratory capacity (IC) is the maximum amount of air a person can inhale after a normal exhalation. It is a key measure in assessing lung function and respiratory health.

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5 Must Know Facts For Your Next Test

  1. Inspiratory capacity is the sum of tidal volume (TV) and inspiratory reserve volume (IRV).
  2. IC is an important parameter used in pulmonary function tests to diagnose conditions like restrictive lung diseases.
  3. Normal values for inspiratory capacity vary based on age, sex, body size, and physical fitness.
  4. A decreased IC can indicate impaired lung expansion or inspiratory muscle weakness.
  5. Measurement of IC can help assess the effectiveness of treatments for respiratory conditions.

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