Normal labour and birth — structured SAQ (15 marks)

(a) Definitions and expected duration (4 marks)

One mark each: latent definition, active definition, nulliparous duration, parous duration. The guideline name is expected, not a bonus. ^[1]

• Latent phase — painful uterine contractions with variable cervical change, including some effacement, and slower dilatation up to 4 cm, in first and subsequent labours (RANZCOG C-Obs 31, adopting the WHO definition).^[1]
• Active (established) phase — regular painful contractions, substantial cervical effacement and more rapid dilatation from 5 cm to full dilatation, in first and subsequent labours.^[1][2]
• Nulliparous — the active first stage usually does not extend beyond 18 hours.^[1][3]
• Parous — the active first stage usually does not extend beyond 12 hours.^[1][3]

A mark is available for adding that these are counselling ceilings from low-risk cohort data, and that a 1 cm per hour expectation is not physiological — the median time to advance 1 cm in nulliparous women exceeds an hour below 5 cm. ^[2]

(b) Assessment and management at 12:00, 6 cm (5 marks)

One mark per component of a structured reassessment plus the correct management decision. ^[1]

• Name the finding: 1 cm in 4 hours from 5 cm meets the RANZCOG consensus definition of slow labour (less than 2 cm in 4 hours from 5 cm). Say the definition, do not just say "slow".^[1][3]
• Reassess the woman: pain relief, hydration, ketones, exhaustion, temperature and pulse, and empty the bladder — reversible causes first.^[1]
• Reassess the labour: abdominal palpation for fifths palpable and contraction frequency, duration and strength by hand; vaginal examination for dilatation, effacement, station, position, caput and moulding; membranes and liquor.^[1][3]
• Reassess the fetus: auscultation or cardiotocography as indicated; escalate surveillance if there is any abnormality.^[1]
• Decide and document: with a well mother, a well baby, intact membranes and no malposition, continuing support and mobility with review is defensible. Amniotomy plus oxytocin may be considered in slow labour with intact membranes, after explaining that the effect on labour length and mode of birth is uncertain — RANZCOG advises against routine amniotomy and against routine combined early amniotomy with oxytocin.^[1][7]

Marks are lost for reflex amniotomy or syntocinon with no assessment, and for omitting the bladder. ^[1][7]

(c) The second stage at 2 hours of pushing (3 marks)

• Escalate. RANZCOG C-Obs 31: after 2 hours of active pushing in a nulliparous woman (1 hour parous), escalation is recommended within local referral protocols.^[1]
• Do not operate on the clock alone. With a well mother, a normal cardiotocograph and a head descending at plus 1, it is reasonable to support a further hour of active pushing if resources and transfer times allow. Decisions to expedite should not rest solely on time frames.^[1][4]
• Justify with outcomes. Spontaneous vaginal birth falls as the second stage lengthens (85% under 1 hour to 9% at 5 hours or more) and chorioamnionitis, severe perineal tears and atony rise — but the second stage does not need to be terminated for duration alone.^[4]

(d) The third stage with a physiological birth plan (3 marks)

• Have the conversation, and have it before she is pushing. Explain that active management reduces postpartum haemorrhage and the need for transfusion — roughly halving the risk — and that a physiological third stage is a legitimate informed choice in a woman at low risk.^[5]
• State the doses if she consents to active management: oxytocin 10 IU intramuscularly with or immediately after birth of the baby, controlled cord traction with suprapubic counter-traction only once the uterus is contracted and separation signs are present, and deferred cord clamping for at least 60 seconds or until pulsation stops.^[5][6][8]
• State your conversion triggers: bleeding more than expected, a placenta undelivered at the agreed time limit, maternal request, or any change in her risk profile during labour or birth. Convert openly and say why.^[5]