Ammonia testing measures the amount of ammonia in the blood. Most ammonia in the body forms when protein is broken down by bacteria in the intestines. The liver’s role is to normally convert ammonia into urea, which is then eliminated and excreted in urine.

However, a good indication of liver dysfunction is when Ammonia levels in the blood rise due to the liver not being able to convert ammonia to urea. This may be caused by cirrhosis or severe hepatitis.

For this test, a blood sample is taken and sent urgently for analyses.