Figure 3: Comparison between the levels of serum SP-D in serum KL-6 and monocytes in BAL. In high SP-D group, serum KL-6 and monocytes in BAL were significantly higher. BAL=Bronchoalveolar lavage, mono=Monocytes, KL-6=Krebs von den Lungen-6, SP-D=Surfactant protein-D