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Ammonia: Definition, Metabolism and Hyperammonemia

Ammonia (NH3) is a nitrogen-containing compound produced in the body during the breakdown of proteins. At high concentrations, it is toxic to the human organism.

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Things worth knowing about "Ammonia"

Ammonia (NH3) is a nitrogen-containing compound produced in the body during the breakdown of proteins. At high concentrations, it is toxic to the human organism.

What Is Ammonia?

Ammonia (chemical formula: NH3) is a colorless, pungent-smelling compound made up of nitrogen and hydrogen. In the human body, ammonia is produced primarily during the breakdown of amino acids and other nitrogen-containing substances. Because ammonia is toxic at elevated levels, the liver converts it into the less harmful compound urea through the urea cycle (also known as the ornithine cycle). Urea is then excreted by the kidneys via urine.

Formation and Metabolism

Ammonia is generated in the body through several pathways:

Breakdown of amino acids (protein building blocks) in the liver and intestine
Bacterial decomposition of protein in the large intestine
Degradation of nucleotides (components of DNA and RNA)
Muscle metabolism, especially during intense physical activity

The liver plays a central role in detoxifying ammonia. Via the urea cycle, ammonia is converted into urea, which is then excreted through the kidneys. A small fraction is also excreted directly by the kidneys as ammonium salts, which is important for acid-base regulation.

Clinical Significance: Hyperammonemia

When blood ammonia levels rise above the normal range (approximately 15–45 µmol/L in adults), the condition is called hyperammonemia. This can have serious neurological consequences, as ammonia can cross the blood-brain barrier and directly damage brain tissue.

Causes of Hyperammonemia

Liver diseases: Cirrhosis, acute liver failure, hepatitis – the liver can no longer adequately detoxify ammonia
Inherited metabolic disorders: Defects in the urea cycle (e.g., ornithine transcarbamylase deficiency)
Medications: For example, valproic acid can interfere with ammonia metabolism
High protein intake or gastrointestinal bleeding in patients with pre-existing liver damage
Urea cycle disorders in newborns

Symptoms of Hyperammonemia

Fatigue, confusion, and personality changes
Headache and nausea
Tremor and movement disorders
In severe cases: loss of consciousness, coma (hepatic encephalopathy)
In newborns: poor feeding, respiratory distress, seizures

Diagnosis

Ammonia levels in the blood are measured using a blood gas analysis or a dedicated laboratory test. The blood sample must be handled carefully (e.g., kept cool and analyzed promptly), as ammonia levels can rise rapidly after collection. Additional tests such as liver function markers (e.g., bilirubin, transaminases) are used to identify the underlying cause.

Treatment

Treatment depends on the underlying cause of the elevated ammonia levels:

Dietary measures: Reducing protein intake to decrease ammonia production
Lactulose: A laxative that lowers the pH in the gut and reduces ammonia absorption
Antibiotics (e.g., rifaximin): Suppression of ammonia-producing gut bacteria
Ammonia scavengers: Medications such as sodium benzoate or sodium phenylbutyrate, which bind and facilitate excretion of ammonia
Treatment of the underlying condition: e.g., managing liver disease or liver transplantation in cases of severe liver failure
For inherited urea cycle disorders: long-term dietary management and medication

Ammonia in the Environment and Industry

Beyond its role as a metabolic byproduct, ammonia is also widely used in industry. It is a key raw material in the production of fertilizers, plastics, and cleaning agents. Inhalation of ammonia gas can cause severe irritation of the respiratory tract, eyes, and mucous membranes. High concentrations can be life-threatening.

References

Butterworth, R.F. (2014). Pathophysiology of hepatic encephalopathy: A new look at ammonia. Metabolic Brain Disease, 17(4), 221–227. PubMed PMID: 12602498.
Haberle, J. et al. (2019). Suggested guidelines for the diagnosis and management of urea cycle disorders: First revision. Journal of Inherited Metabolic Disease, 42(6), 1192–1230. PubMed PMID: 31100448.
World Health Organization (WHO) (2016). Environmental Health Criteria 54: Ammonia. Available at: https://www.who.int

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