Device selection
•Low-frequency (1–5 MHz) curved array transducer
•If low body weight or paediatric patients, high-frequency (5–12 MHz)
Patient position
•Supine and RLD position
•Semi-recumbent is an alternative if unable to turn lateral
"The purpose of volume assessment is to determine whether the volume present is consistent with a baseline fasting state or is likely caused by the ingestion of fluids. This is achieved by determining the antral CSA in the RLD position, as this is the most sensitive position for observing changes in gastric volume.3 Careful observation of the antrum for peristaltic contractions is valuable, as measurements are most sensitive when taken between contractions when the antrum is at its largest."
PMID: 33456894