<prompt> The best test for oesophageal varices isCT- scanGastro- oesophagoscopyTomographyUltrasound  <response>: Endoscopy - upper GI endoscopy represents the most reliable single technique as it shows oesophageal varix and bleeding point Dilated longitudinal veins running a Zig- Zag course Diffuse oesophagal spasm is best diagnosed by Manometry Commonest cause of acute upper GI haemorrhage - Peptic ulcer ref - Srbs manual of surgery 5e p790 