An 81-year-old man is admitted with back pain that started 3 days ago but worsened in the last 3 hours. He is hypotensive (80/40) and tachycardic (120 bpm). An arterial blood gas confirms anaemia (Hb 93 g/L) and AKI (creatinine 150 umol/L). A ruptured aortic aneurysm is considered.

A computed tomography (CT) scan should only be undertaken without contrast in this setting. True or false?