The diagnostic criteria for IPF includes major criteria and minor criteria. The major criteria must include exclusion of other causes of interstitial lung diseaes,<unk>  function tests that is evident of lung fibrosis, bibasilar reticular abnormalities in CT lung, and lung biopsy shows fibrosis. The minor criteria should include 3 of 4 criterion as age > 50, duration of illness more than 3 months, bibasilar inspiratory crackles, and insidious onset of exertional dyspnea.
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