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Related Experiment Videos

Relationship between amniotic fluid optical density and L/S ratio.

J H Slothouber1, P K Flu, H C Wallenburg

  • 1Department of Obstetrics and Gynecology, Ikazia Ziekenhuis, Rotterdam, The Netherlands.

Journal of Perinatal Medicine
|January 1, 1987
PubMed
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Optical density at 650 nm (OD 650) is a simple test for fetal lung maturation. However, this test showed low predictive values, with many false positives and negatives compared to the lecithin-sphingomyelin (L/S) ratio.

Area of Science:

  • Obstetrics and Gynecology
  • Neonatal Medicine
  • Clinical Chemistry

Background:

  • Assessing fetal lung maturity is crucial for managing high-risk pregnancies.
  • The lecithin-sphingomyelin (L/S) ratio is a standard but complex laboratory test for fetal lung maturity.
  • Simpler tests are sought to improve accessibility and speed of fetal lung maturity assessment.

Purpose of the Study:

  • To evaluate the clinical utility of amniotic fluid optical density at 650 nm (OD 650) as a predictor of fetal lung maturity.
  • To determine the correlation between OD 650 measurements and the established L/S ratio.
  • To assess the accuracy of OD 650 in identifying fetal lung maturation.

Main Methods:

  • Collected 90 amniotic fluid samples from pregnant women between 26 and 39 weeks' gestation.

Related Experiment Videos

  • Measured OD 650 and L/S ratio in the same amniotic fluid samples using standard laboratory techniques.
  • Analyzed the correlation between OD 650 and L/S ratio, and calculated false positive/negative rates.

    • Main Results:

    • A statistically significant positive correlation was observed between OD 650 and L/S ratio.
    • Using established thresholds (OD 650 ≥ 0.15, L/S ratio ≥ 2.0), 25.5% of OD 650 readings were false positive.
    • A significant proportion (28%) of OD 650 readings were false negative compared to the L/S ratio.

    Conclusions:

    • The OD 650 test demonstrates a significant correlation with the L/S ratio for fetal lung maturity.
    • However, the high rates of false positive and false negative results limit the clinical applicability of OD 650.
    • The low predictive values of OD 650 readings preclude its routine use as a standalone test for fetal lung maturation.