How is diagnostic evaluation of RBILD?

When pt with non-specific symptoms comes that is a smoker: typical for RB Most imp dx and tx is cessation of cigarettes and exposure to it Labs: typical non-specific ones, may make a1antitrypsin to exclude AAT deficiency PFTs: mixed obstructive-restrictive pattern mild to moderate reduction in DLCO (airway inflammation: obstructive pattern, interstitial disease causes restrictive pattern)