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It is recognised that pregnancy and labour are normal physiological events but ‘normality cannot be assumed without measurement’ (Knight et al., 2014). Maternity early warning score (MEWS) systems adapted for pregnancy are designed to detect when there is deviation from the normal. Regular observations of vital signs should be an integral part of care of all pregnant women. MEWS charts should be readily available and used in obstetric and non‐obstetric areas of the hospital where pregnant woman may present.

There is a minimum dataset of observations suggested at each assessment which should be recorded on a MEWS chart (Algorithm 5.1). The minimum recommended frequency of observations as an inpatient is 12 hourly. Frequency of observations is determined by risk status, initial observations and working diagnosis. Women should retain the same MEWS chart when moving from one clinical area to another, so that physiological trends can be detected.

MEWS scores outside the normal range for pregnancy are recorded in the coloured zones of the chart and should immediately trigger communication using the SBAR (situation, background, assessment and recommendation) communication tool with appropriate medical staff asking for urgent review (Box 5.1). The clinician should undertake a full systematic review, resuscitate and treat as required and order appropriate investigations. It must be emphasised that just recording observations however regularly or meticulously is not enough: abnormal ones must be acted upon . If the clinician who has been contacted is unable to attend within 10 minutes, options include contacting a more senior obstetrician or the anaesthetic team. Consider early obstetric consultant and anaesthetic consultant involvement. If a senior speciality trainee has deputised a more junior obstetrician to attend, then the midwife and charge midwife need to assess whether this is an appropriate level of clinician attending and consider escalation as outlined. It is important to care for the woman in the most appropriate clinical area. If this is not possible, then a delay in transfer must not delay immediate history taking, examination, investigations, treatment, note review and reassessment of ABCD. Contact the clinical manager on call for assistance if required.

In non‐obstetric areas such as the emergency department or acute medical unit there should be clear routes for effective communication with the obstetric team for all pregnant women. Routes for escalation should be clear to all staff should the woman’s observations on the MEWS chart trigger a review or her condition clinically deteriorates. If a pregnant woman is triaged by the ambulance or emergency department staff to the emergency department resuscitation room a 2222 ‘obstetric emergency’ call (or equivalent) should be activated to ensure a full team including a neonatologist is available.