A normal ultrasound excludes abruptio placentae because every confirmed case shows haemorrhage on ultrasound.

The lecture states that **more than 50%** of patients with confirmed abruption have evidence of haemorrhage on ultrasound. This does not mean every case is visible; therefore, a normal ultrasound cannot be treated as excluding abruption. The material also identifies abruption as a clinical diagnosis, with ultrasound serving an important role in diagnosis and characterization.\n\n**Key takeaway:** Ultrasound can support the diagnosis, but a negative scan does not rule out abruption.\n\n**Glossary:** **Abruption**: Premature separation of the placenta; **ultrasound**: Imaging using high-frequency sound waves.