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  • Title: Comparison of urinary estrogens, contraction stress tests and nonstress tests in the management of postterm pregnancy.
    Author: Khouzami VA, Johnson JW, Daikoku NH, Rotmensch J, Hernandez E.
    Journal: J Reprod Med; 1983 Mar; 28(3):189-94. PubMed ID: 6854549.
    Abstract:
    In a retrospective review of 697 postterm pregnancies we attempted to validate three tests used to identify the fetus at increased risk: the 24-hour urinary estrogen per gram creatinine (E/Cr), the nonstress test (NST) and the contraction stress test (CST). Using the corrected perinatal mortality rate (PMR) among term pregnancies (0.23%) as a standard for comparison, we found the PMRs among postterm patients with negative screening tests to be as follows: 0.23% with normal E/Crs, 0.65% with negative CSTs (not significantly different) and 2.4% with reactive NSTs (p less than 0.005). When we used intrapartum fetal distress as a standard for comparison, the E/Cr exhibited the highest sensitivity (88%) whereas those of the CST and NST were much lower (7-10%). The specificities were 63%, 98% and 92%, respectively. From this retrospective study the E/Cr appears to be of most assistance in identifying fetuses at increased risk, the CST is of intermediate assistance, and the NST is of least assistance.
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