YesSerum YKL-40 HP 56 ng/mL IPF NMOptimal cutoff for HP vs. IPF:Serum YKL-40 121 ng/mL AUC 0.741Serum KL-60: 1441 U/mL AUC 0.702. This evidence concerns the gene CHI3L1 and hypersensitivity pneumonitis.