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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.
Full Answer. Many factors can cause a personâs blood ammonia levels to be high, including medications that increase these levels and a high-protein diet. However, abnormally high level of ammonia in the blood may be a sign of different medical conditions, such as liver failure, hypokalemia, congestive heart failure, leukemia and hyperthermia.