Abstract
Amino acids were quantitated by ion-exchange chromatography in amniotic fluid and maternal plasma from Rh-sensitized pregnancies. Twenty-four patients of 34 to 40 weeks' gestation were studied, and results were compared to those in normal pregnancy. Significant differences were found for amino acid concentrations in amniotic fluid and maternal plasma from those patients in whom fetal death occurred. When the fetus survived, amino acid levels were similar to normal levels. In particular, it was noted that proline levels were markedly elevated in the amniotic fluid of patients in whom fetal death occurred (p < 0.001). From this preliminary work arises the interesting possibility that an increased amniotic fluid versus maternal plasma proline level may be of diagnostic assistance in severe Rh disease.
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