WEBForced expiratory flow (FEF). This is the average rate of flow during the middle half of the FVC test. Peak expiratory flow rate (PEFR). This is the fastest rate that you can force air out of your lungs. Normal values for PFTs vary from person to person.
GLOBAL RANK
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Alexa Rank Country N/A
Daily Unique Visitors
Monthly Unique Visitors
United States
11,680
Indonesia
9,135
Taiwan
2,971
United Kingdom
2,637
Brazil
2,386
Nigeria
2,086
Egypt
1,753
Hong Kong
1,655
Canada
1,655
Australia
1,442
Philippines
1,032
India
1,005
Malaysia
988
Spain
819
Germany
797
Mexico
764
France
721
Italy
666
Turkey
612
Iraq
557
Thailand
546
Netherlands
524
Israel
519
Cambodia
431
Algeria
333
Ireland
300
Romania
289
Jordan
268
Poland
257
Ghana
246
Argentina
235
South Africa
213
Belgium
191
Czechia
175
Ukraine
164
Japan
164
Morocco
158
South Korea
153
Lebanon
147
Saudi Arabia
142
Austria
137
Hungary
131
Sweden
126
Singapore
120
Pakistan
115
Bangladesh
109
Denmark
104
Greece
98
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