At a Glance
Why Get Tested?
To detect elevated concentrations of ammonia in the blood, to help diagnose severe liver disease and certain genetic urea cycle disorders, to investigate changes in consciousness, or to help diagnose hepatic encephalopathy and Reye’s syndrome
When to Get Tested?
If a patient experiences mental changes or lapses into a coma of unknown origin; if an infant or child experiences frequent vomiting and increased lethargy as a newborn or about a week after a viral illness
A blood sample taken from a vein or artery in your arm
Test Preparation Needed?
Avoid smoking cigarettes prior to collection of the specimen and follow any other instructions that you are given