May function in innate immunity through activation of the lectin complement pathway (By similarity). Binds to GalNAc and GlcNAc carbohydrate moieties (PubMed:12679857). Homotrimer (By similarity). May form higher-order oligomers (PubMed:12679857). Strongly expressed in spleen, liver and heart. Also detected at lower levels in lung. The fibrinogen C-terminal domain mediates binding to carbohydrates. N-glycosylated. Belongs to the ficolin lectin family.