USMLE Step 2 CK Lecture Notes 2019: Obstetrics/Gynecology (Kaplan Test Prep)

Stage 4 is not an official stage of labor but rather a critical 2 h period of close
observation of the parturient immediately after delivery. Vital signs and vaginal
bleeding are monitored to recognize and promptly treat preeclampsia and
postpartum hemorrhage.

Figure I-14-1.  Old versus  New Labor   Curves

Signs   of  stage   3   include gush    of  blood   vaginally,  change  of  the uterus  from

long    to  globular,   or  “lengthening”   of  the umbilical   cord

Duration    may be  up  to  30  minutes in  all women.

Main    abnormality is  prolonged   third   stage.