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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.
High levels of ammonia in the blood are dangerous and can cause symptoms such as confusion, sluggishness, and coma. High ammonia levels in the blood can result from acute liver failure. Cirrhosis of the liver and poor liver function can also cause high levels.