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Test Code NNH3 Ammonia, Plasma

Important Note

Due to specimen stability requirements, this test cannot be collected at sites other than St Joseph Hospital.  Please ask patients to come to the hospital lab for their specimen collection.

Additional Codes

EPIC:  LAB47

Methodology

Enzymatic
Used in the diagnosis of hepatic encephalopathy and hepatic coma in the terminal stages of liver cirrhosis, hepatic failure, acute and subacute necrosis, and Reye’s syndrome.

Performing Laboratory

St. Joseph Hospital

Specimen Requirements

Collect a full, lavender top (EDTA) tube. Invert several times to mix blood and immediately place on wet ice. Transport to Lab ASAP.  Centrifuge for 10 minutes in a refrigerated centrifuge and remove plasma from cells within 30 minutes of collection.  

Reference Values

Male: 16-60 umol/L

Female: 11-61 umol/L

Day(s) Test Set Up

Monday through Sunday

Available STAT

Test Classification and CPT Coding

82140