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
8,183
Indonesia
6,401
Taiwan
2,081
United Kingdom
1,848
Brazil
1,672
Nigeria
1,461
Egypt
1,228
Hong Kong
1,159
Canada
1,159
Australia
1,010
Philippines
723
India
704
Malaysia
692
Spain
574
Germany
559
Mexico
536
France
505
Italy
467
Turkey
428
Iraq
390
Thailand
383
Netherlands
367
Israel
363
Cambodia
302
Algeria
233
Ireland
210
Romania
203
Jordan
187
Poland
180
Ghana
172
Argentina
165
South Africa
149
Belgium
134
Czechia
122
Ukraine
115
Japan
115
Morocco
111
South Korea
107
Lebanon
103
Saudi Arabia
99
Austria
96
Hungary
92
Sweden
88
Singapore
84
Pakistan
80
Bangladesh
77
Denmark
73
Greece
69
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