The serum SP-D level of healthy controls ranged from 14.63 ng/ml to 36.47 ng/ml (median of 24.68 ng/ml; 25-75th IQR of 19.22–27.63 ng/ml), while the serum SP-D level of GDM patients ranged from 9.44 ng/ml to 60.14 ng/ml (median of 31.06 ng/ml; 25-75th IQR of 14.70–48.65 ng/ml). Here, SFTPD is linked to gestational diabetes.