Abstract
Neopterin and biopterin concentrations were measured in amniotic fluid in 226 pregnancies from the 12th week of gestation to term. At mid-gestation, neopterin and biopterin levels were low and remained relatively constant between 12 and 26 weeks of gestation, whereas during the third trimester, a progressive increase was observed. Near term the values were greater than those in maternal serum and the higher neopterin to biopterin ratio suggested that pteridine concentration in amniotic fluid may reflect the maturation of pteridine metabolism in the fetus.
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