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Related Experiment Videos

Unusual amniotic fluid spectral analysis in Rh sensitization.

G H Nelson, W P Kanto, G P Williams

    Southern Medical Journal
    |February 1, 1979
    PubMed
    Summary

    Optical density (OD) measurements at 450 millimicrons typically decrease in late pregnancy. Modest increases in OD 450 in Rh-negative pregnancies may not indicate fetal hemolytic disease.

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    Area of Science:

    • Obstetrics and Gynecology
    • Maternal-Fetal Medicine
    • Neonatal Care

    Background:

    • Optical density (OD) measurements at 450 millimicrons are used to assess fetal well-being.
    • A decline in OD 450 is expected in the latter half of gestation for unaffected pregnancies.
    • Rh-negative pregnancies require careful monitoring for fetal hemolytic disease.

    Purpose of the Study:

    • To evaluate the significance of modest increases in OD 450 during mid-gestation in Rh-negative pregnancies.
    • To determine if these increases correlate with fetal hemolytic disease.

    Main Methods:

    • Retrospective analysis of OD 450 measurements in Rh-negative pregnancies.
    • Correlation of OD 450 trends with infant outcomes.

    Main Results:

    • Observed a progressive decline in OD 450 in uncomplicated pregnancies.
    • Identified two Rh-negative cases with a rise in OD 450 between 24-27 weeks (0.140 to 0.200).
    • Both infants in these cases were unaffected by hemolytic disease.

    Conclusions:

    • Caution is advised when interpreting modest increases in OD 450 between 24-27 weeks gestation.
    • Such increases in Rh-negative pregnancies may not necessarily indicate fetal hemolytic disease.

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