. Author manuscript; available in PMC: 2014 Apr 24.

Published in final edited form as: Med Clin North Am. 2012 May 31;96(4):745–752. doi: 10.1016/j.mcna.2012.04.011

Table 1. FEV₁ : Forced expiratory volume in one second. FVC: Forced Vital Capacity.

GOLD 2001	GOLD 2011	FEV₁/FVC ratio	FEV₁ (% predicted)
0: “At risk”	Not applicable
I: Mild	I: Mild	≤ 0.7	≥ 80
II: Moderate	II: Moderate	≤ 0.7	50-79
III: Severe	III: Severe	≤ 0.7	30-49
IV: Very Severe	IV: Very Severe	≤ 0.7	<30

Table 1. FEV1 : Forced expiratory volume in one second. FVC: Forced Vital Capacity.