In this post I link to and embed Gulfcoast Ultrasound Institute‘s YouTube video, Hot Tips – Scanning the Spleen in the Supine Position. and to Spleen Protocol from Sononerds.
In addition to the excellent videos, please review The ultrasound examination of the spleen [PubMed Abstract] [Full-Text PDF]. Med Ultrason. 2010 Sep;12(3):253-4.