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Coma Panel >> Blood Ammonia
Blood Ammonia

Ammonia levels in the blood rise when the liver is not able to convert ammonia to urea. This may be due to some severe liver disease such cirrhosis (irreversible shrinkage of liver) or hepatitis (inflammation of liver).

To determine how well the liver is functioning

  • To evaluate the effect of treatment on severe liver disease, such as cirrhosis
  • To confirm the diagnosis of a childhood disorder called Reye's syndrome that can damage the liver and the brain. Ammonia testing can also help predict the outcome (prognosis) of a diagnosed case of Reye's syndrome.
  • Check the level of blood ammonia in a person receiving high-calorie parenteral nutrition

Are there any special precautions?
Ideally, you should not eat, drink anything other than water, or smoke for 8 hours before having an ammonia blood test. Also avoid strenuous exercise just prior to having this test

How soon the results are available?
Results are usually available within 12 hours.

What the results of blood ammonia test will tell me?
Normal range: 10 - 40 umol/L.

High values
High levels of ammonia in the blood may be caused by:

  • Liver disease
  • Reye's syndrome
  • Heart failure
  • Kidney failure
  • Severe bleeding from the stomach or intestines

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