The serum plasminogen status in 35 preterm infants with or without res
piratory distress syndrome (RDS) was determined in the first few hours
of life. Blood smaples for plasminogen testing (Synthetic chromogenic
substrate method; Stachorm PLG. Diagnostica Stage) were obtained from
a peripheral vein within six hours after birth. Among 35 infants, 20
infants who were in stable clinical condition served as the control gr
oup. Fifteen developed RDS with clinical, laboratory and radiological
findings. The mean plasma plasminogen levels were found to be similar
in the two groups (p > 0.05 by Mann-Whitney U test). These findings ar
e discussed along with our previous findings showing normal tissue pla
sminogen activator (tPA) but lower D-dimer and higher plasminogen acti
vator inhibitor (PAI) levels within the first few hours of life in pre
term infants who later developed RDS compared to the control group.