What is the role of serum ammonia levels in the evaluation of acute liver failure?

Updated: Jun 13, 2019
  • Author: Gagan K Sood, MD; Chief Editor: BS Anand, MD  more...
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Answer

Serum ammonia

The serum ammonia level may be elevated dramatically in patients with fulminant hepatic failure. The arterial serum ammonia level is the most accurate measurement, but venous ammonia levels are generally acceptable. An elevated serum ammonia level does not exclude the possibility of another cause for mental status changes (notably, increased intracranial pressure and seizures).


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