What is the average interval of the first and second stages of labor?

Updated: Jan 24, 2019
  • Author: Sarah Hagood Milton, MD; Chief Editor: Christine Isaacs, MD  more...
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As the childbearing population in the United States has changed, the clinical obstetric management of labor also has evolved since Friedman's studies. Data from number a studies have suggested that normal labor can progress at a rate much slower than that Friedman and Sachtleben [6, 7] had described. Zhang et al examined the labor progression of 1,162 nulliparas who presented in spontaneous labor and constructed a labor curve that was markedly different from Friedman's: The average interval to progress from 4-10 cm of cervical dilatation was 5.5 hours compared with 2.5 hours of Friedman's labor curve. [20] Kilpatrick et al [8] and Albers et al [9] also reported that the median lengths of first and second stages of labor were longer than those Friedman suggested.

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