Serum concentrations of non-esterified fatty acids (NEFA) remain unchanged up to the 21th week of gestation in comparison to non-pregnant women; also after the 37th gestational week only slightly increased concentrations are observed in women without labour. Under delivery, however, NEFA in maternal serum are approximately three times higher than those of non-pregnant women. This increase occurs only in NEFA with a chain-length of C12 to C18. Post partum values reach those of non-pregnant women within a few days. The concentrations of NEFA with a chain-length of C12 to C18 in umbilical artery and vein are significantly lower than in maternal serum.
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