Lab test

Ammonia Test - Ammonia Levels Liver Test

An ammonia blood test measures the amount of ammonia in the blood, a waste product that the liver normally processes.

Typical price

From $198

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

An ammonia blood test measures the amount of ammonia in the blood, a waste product that the liver normally processes. When liver function is reduced, ammonia can build up. Clinicians order it to help assess liver function, especially when there are symptoms such as confusion, unusual tiredness, or changes in alertness. It is interpreted alongside other liver tests and clinical findings.

• Blood ammonia A waste product normally processed by the liver, measured to help assess liver function.

• People with known or suspected liver dysfunction.
• Individuals with confusion, drowsiness, or changes in alertness.
• Those with unusual fatigue and liver-related symptoms.
• People being monitored for complications of liver disease.
• Anyone with abnormal liver tests being evaluated further.

• Fasting may be requested; follow the provider's instructions.
• Avoid smoking and strenuous exercise before the draw.
• Take medications as directed unless told otherwise.
• The sample must be handled and processed promptly.
• Tell the provider about liver conditions and current medications.

An elevated blood ammonia can be associated with reduced liver processing and may accompany symptoms such as confusion or drowsiness. Levels can be affected by sample handling, fasting, and other factors, so results are interpreted with clinical findings and other liver tests. A single value does not establish a diagnosis. Discuss your result with a healthcare provider.

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