Alanine Aminotransferase (ALT) : 823

Test Code
ALTAU or 823

Alias/See Also

CPT Codes

The assay manufacturer, Beckman Coulter, warns that patients treated with sulfasalazine may generate false low results for ALT.

Transport Container
Preferred Specimen
1 mL serum

Alternative Specimens
Sodium heparin (green-top) tube; Lithium heparin (green-top) tube

Minimum Volume
0.5 mL

Transport Temperature
Room temperature.

Specimen Stability
Serum and plasma:
Room temperature: 72 hours; Refrigerated: 5 days; Frozen: Unacceptable

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Anticoagulants other than heparin


Setup Schedule
Sunday - Saturday

Report Available
1 day

Reference Range
                                Male (U/L)          Female (U/L)

<1 Month 3-25                         3-25

1-11 Months 4-35                         3-30

1-3 Years                  5-30                         5-30

4-12 Years                8-30                         8-24

13-15 Years              7-32                         6-19

16-19 Years              8-46                         5-32

≥20 Years 9-46                         6-29

Clinical Significance
Alanine Aminotransferase (ALT) measurements are particularly useful in the diagnosis and management of certain liver diseases, e.g., viral hepatitis and cirrhosis. ALT activity in tissue is generally much lower than aspartate aminotransferase (AST) activity and is found in highest concentrations in the liver. Significant elevations of ALT occur only in diseases of the liver. ALT is often measured in conjunction with AST to determine whether the source of the AST is the liver or the heart. ALT is normally not elevated in cases of myocardial infarction, i.e., a normal ALT, in conjunction with an elevated AST, tends to suggest cardiac disease. However, slight elevations of ALT may occur if an infarct destroys a very large volume of heart muscle.

Performing Laboratory
med fusion

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.