Best test for lung flbrosis-

Ans. is 'c' i.e., HRCT o Lung fibrosis is a diffuse parenchymal lung disease.o Idiopathic pulmonary fibrosis is the most common form of idiopathic interstitial pneumonia.o We have already discussed that best investigation for interstitial lung disease is HRCT.Estimated relative frequency of the interstitial lung diseaseDiagnosisRelative frequency, %o Idiopathic interstitial pneumonias40# Idiopathic pulmonary fibrosis55# Nonspecific interstitial pneumonia25# Respiratory bronchiolitis-ILD and desquamative interstitial pneumonia15# Cryptogenic organizing pneumonia3# Acute interstitial pneumonia<1o Occupational and environmental26o Sarcoidosis10o Connective tissue diseases9o Drug and radiation1o Pulmonary hemorrhage syndromes<1o Other13