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Video 18-11: This video shows a pleural effusion with well-demarcated interface between an echogenic-dependent layer and an anechoic nondependent layer.

From: Critical Care Ultrasonography, Second Edition

This is termed the hematocrit sign, and is caused by gravitational effect on cellular components of the fluid. The 3.5 MHz transducer is in longitudinal orientation and placed perpendicular to the chest wall to scan through the 6th intercostal space in the left mid-axillary line.

11 secs
Author(s) Lewis Eisen, Peter Doelken, Sahar Ahmad
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