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Quick Answer. A personâs normal ammonia level typically ranges between 15 to 45 micrograms per deciliter. To determine these levels, an ammonia blood test is performed.
An ammonia test 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 normally converts ammonia into urea, which is then eliminated in urine. Ammonia levels in the blood rise when the liver is not able to convert ammonia to urea. This may be caused by cirrhosis or severe hepatitis. For this test, a blood sample may be taken from either a vein or an artery. An ammonia test is done to: 1  Check how well the liver is working, especially when symptoms of confusion, excessive sleepiness, coma, or hand tremor are present.  Check the success of treatment for severe liver disease, such as cirrhosis.