CRP and idiopathic pulmonary fibrosis: Clinical parameters such as baseline lung function [14, 20–23], worse oxygenation [14, 24], neutrophils and lymphocytes in BALF [14, 15], and blood biomarkers like CRP [14], LDH [24, 25], and KL-6 [24] have been identified as prognostic factors of AE-IPF, though their impact has varied between studies.