COMPARISON OF URINARY ESTROGENS, CONTRACTION STRESS TESTS AND NONSTRESS TESTS IN THE MANAGEMENT OF POSTTERM PREGNANCY

  • 1 January 1983
    • journal article
    • research article
    • Vol. 28  (3) , 189-194
Abstract
In a retrospective review of 697 postterm pregnancies, 3 tests used to identify the fetus at increased risk were validated as follows: the 24-h urinary estrogen/g 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, PMR among postterm patients with negative screening tests were as follows: 0.23% with normal E/Cr, 0.65% with negative CST (not significantly different) and 2.4% with reactive NST (P < 0.005). When intrapartum fetal distress was used as a standard for comparison, the E/Cr exhibited the highest sensitivity (88%); those of the CST and NST were much lower (7-10%). 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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