A normal uterine activity (UA)pattern in labor is characterized by:

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Contraction frequency overall generally ranges from two to five per 10 minutes of labor,with lower frequencies during the first stage and higher frequency seen during the second stage.Contraction duration remains fairly stable throughout the first and second stages,ranging from 45 to 80 seconds,not generally exceeding 90 seconds.Contractions 1 minute apart are too often,and this would be considered an abnormal labor pattern.Intensity of uterine contractions generally ranges from 25 to 50 mm Hg in the first stage of labor and may rise to more than 80 mm Hg in the second stage.

A Normal Uterine Activity (UA)pattern in Labor Is Characterized By