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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.
Gastrointestinal Bleeding. Gastrointestinal bleeding may cause an elevated blood ammonia level. Red blood cells contain a high concentration of protein. Significant bleeding, especially in the upper part of the digestive system, increases the protein load in the intestine and the production of ammonia.