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What is Which is best for diagnosis of Hypersensitivity pneumonitis? and explain in detail?
Hypersensitivity pneumonitis: Type IV HSR Chest Imaging - normal in Hypersensitivity pneumonitis Pulmonary function testing - Obstructive pattern Clinical prediction rule- eg Farmer's Lung Exposure to antigen Presence of precipitin Recurrence of symptoms >4-6 hrs Crackles on auscultation Weight loss Farmer lung:- Thermophilus actinomyces