Ammonia

Test Code

AMM

CPT Codes
82140

Preferred Specimen

GREEN Lithium Heparin Plasma On Ice

Minimum Volume

0.25 mL

Other Acceptable Specimens

Venous Blood in Green Microtainer On Ice

Instructions

Separate from cells within 15 minutes of collection

Transport Container

GREEN Lithium Heparin

Transport Temperature

On Ice

Specimen Stability

Room Temp: N/A; Refrigerated: 3 hours

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Not received on ice, Not separated within 15 minutes, Gross hemoloysis

Methodology
Vitros 7600/3400

Reference Range

15-51 ug/dL

Clinical Significance

Ammonia is a waste product of protein catabolism; it is potentially toxic to the central nervous system. Increased plasma ammonia may be indicative of hepatic encephalopathy, hepatic coma in terminal stages of liver cirrhosis, hepatic failure, acute and subacute liver necrosis, and Reye’s syndrome. Hyperammonemia may also be found with increasing dietary protein intake

Performed By
RFGH Laboratory

Performing Laboratory
RFGH Laboratory

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.