<prompt> Rate of cervical dilatation in primi during the active phase of labour is:0.5 cmhr1 cmhr1.5 cmhr2 cmhr.  <response>: Ans. b 1 cmhr. Ref. Dutta Obst. 6th ed. p 131DIAGNOSIS OF STAGE AND PHASE OF LABOURFALSE LABOURNOT IN LABOUR Cervix not dilatedTRUE LABOUR:First stage The first stage of labor is that portion leading up to complete dilatationLatent Cervix dilated 4-9 cm Rate of dilatation typically 1 cm per hour or more Fetal descent beginsActive Cervix fully dilated 10 cm Fetal descent continues No urge to pushSecond stageEarly non-expulsive Cervix fully dilated 10 cm Presenting part of fetus reaches pelvic floor Woman has the urge to pushLatent Phase Taking up of cervix is determined by obliteration of projection of cervix into vagina. The anterior lip of cervix is the last to be effaced.CERVICAL DILATATION Cervical dilatation related with dilatation of external OS. Cervical dilatation is expressed either in terms of fractions of full dilatation l4th; 12 or 34th OR in terms of fingers - 2, 2, 3 or fully dilated; OR better in terms of cm 10 cm when fully dilated. Taking up is expressed in terms of fractions.One finger equals to 1.6 cm Partogram Freidmans Curve is composite graphical record of OS dilatation and descent of head against duration of labour in hrs. Dilatation of cervix at rate of lcmhr in primi and 1.5 cm in multi, beyond 3cm dilatation is satisfactory. In primi, latent phase is long 8hrs and cervical dilatation occurs at 0.35 cmhr.Stages of LaborStageStartsEndsDurationCommentsFirst MrimiMultib LatentOnset of labor to 3-4 cm dilation6-11 hrs4-8 hrsProlongation seen with excessive sedation and hypertonic uterine contractions.Active4 cm to complete cervical dilation 10 cm4-6 hrs1.2 cmhr2-3 hrs1.5 cmhrProlongation seen with cephalopeivic disproportion.SecondComplete cervical dilation to0.5-3.0 hrs5-30 minBaby goes through all cardinal delivery of infant movements of labor.ThirdDelivery of infant to delivery0-0.5 hr0-0.5 hrPlacenta separates and uterus of placenta contracts to establish hemostasis. PROGRESS OF LABOR For primi, labor usually lasts about 12-14 hours. For multi, labor is generally quicker, lasting about 6-8 hours. During labor, the cervix dilates opens and effaces thins. Labor should be progressive. Serial vaginal examinations are used to plot the course of labor, detect abnormalities, and allow for intervention. While there are no set time intervals for performing pelvic examinations, the cervix should progressively dilate during active phase labor at a rate of no less than 1.2 cmhour for first babies to 1.5 cmhour for subsequent babies. 