SERPINA1 and gestational diabetes: The spectral abundance of alpha-1-antitrypsin (SERPINA1) was positively correlated with serum glucose at time 0 (GTT 0 h) (r = 0.8, p < 0.05) and negatively correlated with HOMA-IR (r = −0.4, p < 0.05) in GDM group (Figure 6a).