Careful and extensive investigations in multiple visits to ensure the<unk><unk><unk>  is accurately diagnosed. :*10 to 20% of patients with IPF have positive rheumatoid factor or positive circulating anti-nuclear antibodies (ANAs), but rarely are titers high. However only the presence of high titers (> 1:160) would suggest the presence of a connective tissue disease .   *
Idiopathic interstitial pneumonia differential diagnosis
Hypersensitivity pneumonitis differential diagnosis
Lymphomatoid granulomatosis differential diagnosis
Bronchiolitis differential diagnosis
Lung abscess differential diagnosis
Bronchiectasis differential diagnosis
Sarcoidosis differential diagnosis
Bronchitis differential diagnosis