 [ Symptoms ] my 2 year old has been throwing up for about 10 hours and has not gone to the bathroom in 8 hours what should i do [ Disease ] a fibroscan is a non invasive imaging study that evaluates the degree of liver stiffness or scaring known as fibrosis it does this by determining the speed of sound waves through the liver utilizing a sonogram similar to blood tests such as fibrotest and fibrosure the fibroscan works well in determing the 2 extremes of liver disease   minimal or no scarring from cirrhosis it does not work so well in evaluating moderately damaged livers and this scan is not yet approved in the u s liver biopsy while not perfect still remains the gold standard for determining the stage of liver disease