What Is the Normal Ammonia Level?

The normal ammonia levels may vary a bit from lab to lab, so the values mentioned below are more like a reference range. The best thing to confirm your ammonia levels are normal is to check the range your lab uses – it will be there on your lab report.

Generally, for adults, anything between 9.5 and 49 micrograms per deciliter (mcg/dL) is considered normal.

The levels of ammonia are considered normal in children if they are between 40 and 80mcg/dL.
In newborns, the levels of ammonia should be between 90 and 150 mcg/dl.

It is still important to consult with your healthcare provider because sometimes a value that falls outside these normal values may still be considered normal due to many other factors and the range your lab has used.