Transverse Subcostal View
The first view in the series to exclude structural abnormality is the transverse subcostal view. Place your echo probe under the xiphisternum, with the side marker on the probe pointing directly to the patient's left. Ensure that the screen is set up such that the side marker (e.g. the yellow 'V' in the image below) is positioned to the right of the apex of the viewing triangle.
(IVC-Inferior Vena Cava, Ao-Aorta)
From this view much of the image is liver, but towards the bottom of the screen you should be able to see a circular pulsatile descending aorta, and an oval inferior vena cava. The aorta should be to the subject's left, i.e. on the right of the screen.