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The HRU (SRU) view is the most gravity‐dependent view in right lateral recumbency (the SRU when in left lateral recumbency) and completes the four AFAST views and the calculation of its applied fluid scoring system and assigning the AFS (see Chapter 7). The “rabbit ear sign” is typical in large‐volume effusions created by small intestine and omentum wafting in the free fluid and typical positives are shown in Figure 6.32. Furthermore, if positives were previously seen at the other less gravity‐dependent AFAST views, the sonographer is already anticipating the likelihood of performing abdominocentesis at the HRU view (SRU view in left lateral recumbency).

Pearl: Fluid must always be characterized if safely retrievable by abdominocentesis because ultrasound cannot characterize the type of fluid based on its echogenicity.