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Total and unconjugated plasma estriol. A comparison
Clinical and Experimental Obstetrics & Gynecology
|January 1, 1982
Summary
Total plasma estriol is a more sensitive marker than unconjugated estriol for diagnosing pregnancy complications like E.P.H. gestosis and intrauterine growth restriction. This makes total estriol preferable for effective pregnancy monitoring.
Area of Science:
- Biochemistry
- Obstetrics
- Endocrinology
Background:
- Estriol, a key pregnancy hormone, exists in conjugated and unconjugated forms.
- Plasma estriol levels change throughout gestation and can be affected by pregnancy complications.
- Understanding the distinct behavior of estriol fractions is crucial for accurate pregnancy assessment.
Purpose of the Study:
- To compare the clinical utility of total plasma estriol versus unconjugated estriol in monitoring normal and pathological pregnancies.
- To determine which estriol fraction offers better diagnostic accuracy for pregnancy complications.
Main Methods:
- Plasma samples were collected from 161 normal and 44 pathological pregnancies between 24 and 40 gestational weeks.
- Levels of total and unconjugated estriol were measured.
- Correlation between the two fractions and their diagnostic performance for pregnancy complications were analyzed.
Main Results:
- No consistent correlation was found between total and unconjugated estriol levels across different gestational ages.
- Pregnancy complications significantly altered the ratio between the two estriol fractions.
- Total estriol demonstrated higher sensitivity, predictive value, and relative risk for diagnosing E.P.H. gestosis and poor intrauterine fetal growth compared to unconjugated estriol.
Conclusions:
- Total plasma estriol is a more sensitive and reliable indicator for monitoring pregnancy status and diagnosing complications.
- The assay of total estriol should be preferred over unconjugated estriol for improved clinical management of pregnancy complications.