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chest expansion
Chest expansion is measure as the difference between maximal inspiration & maximal forced expiration in the 4th intercostal space (males) or just below the breasts (females). Normal chest expansion is 5 cm or greater.
General
physical examination technique
References
Harrison's Principles of Internal Medicine, 14th ed.
Fauci et al (eds), McGraw-Hill Inc. NY, 1998, pg 1905