A normal blood pressure reading is not always a reassuring sign!
Systolic blood pressure usually only falls after 1500 ml blood loss (25% of circulating volume).
A pink cannula is virtually useless in a pregnant woman.
Tachycardia should not be ignored (>100 bpm).
Shock index is useful in identifying a deteriorating patient.
Tachypnoea should not be ignored (>21 breaths per minute). The respiratory rate is often overlooked but rates over 30 per minute are indicative of a serious problem.
Modified Early Obstetric Warning Scoring system (MEOWS) helps in early recognition of a deteriorating patient). Abnormal scores should not just be recorded but should also trigger an appropriate response.