Equipment Bedside ultrasound machine Low-frequency (eg, 2 to 5 MHz) probe (transducer), either curvilinear or phased-array * High-frequency (eg, 5 to 10 MHz) linear probe, for examining the pleura Ultrasound gel (nonsterile) or, often, water-based surgical lubricant Glove, to cover probe tip (providing barrier protection) * A phased array probe is often preferred for E-FAST because its small footprint can more readily be placed between the ribs.