Gastric Volume

By using pattern recognition you can use the following images to compare with the images your are obtaining when interrogating the gastric antrum. The following algorithm walks you through and guides you to the correct aspiration risk estimation. Keep in mind you must follow NPO guidelines. Use in BMI up to 40, non-pregnant adults only.A pediatric formula is provided :

Do you see this image?

Grade 0 RLD.gif

Do you see this image?

Grade 2 Full02.gif

Do you see this image?

Grade 2 Full stomach 01.gif

Or this one? (72).gif

Or this one?

Grade 2 clear distended image.gif

Gastric Volume Calculator ( Non pregnant)

At this point the risk appears intermediate since you don't know if what you are seeing is more than gastric secretions. Use the following gastric volume estimator to evaluate risk. A result indicating >1.5ml/kg volume implies a high aspiration risk. The gauge at the bottom of the calculator will give you an estimate or the risk.

You will need the cross sectional are on RLD. To calculate  or estimate it click 


Interpretation of Findings


Grade 0 Gastric Antrum

Minimal Aspiration Risk

Interpretation of Findings


Full Stomach

High Aspiration Risk

Unable to estimate risk