Test guide
Ammonia Levels
An ammonia levels test measures the amount of ammonia in a sample of your blood. Ammonia is also called NH3. It is a normal waste product in your body. Healthy bacteria in your intestines make ammonia when you digest protein in the foods you eat.
What it is for
An ammonia levels test may be used to help diagnose high ammonia levels in people who have symptoms. The test alone can't diagnose conditions that increase the amount of ammonia in your blood. But it may be used with other tests to help find the cause. Ammonia levels testing can help diagnose conditions such as: Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
Also known as
- NH3 test, blood ammonia test, serum ammonia, ammonia
- plasma
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