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Test Name

Aspartate Aminotransferase (AST)

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CPT Code(s)**

84450
**IMPORTANT: CPT Code is informational only; obtain the Test Code for ordering.

Methodology

Spectrophotometry  (SP)

Reference Range(s)

  Male (U/L) Female (U/L)
<1 Month 3-51 3-49
1-11 Months 3-65 3-79
1-3 Years 3-56 3-69
4-6 Years 20-39 20-39
7-19 Years 12-32 12-32
20-49 Years 10-40  
20-44 Years   10-30
≥45 Years   10-35
≥50 Years 10-35  

Clinical Significance

AST is widely distributed throughout the tissues with significant amounts being in the heart and liver. Lesser amounts are found in skeletal muscles, kidneys, pancreas, spleen, lungs, and brain. Injury to these tissues results in the release of the AST enzyme to general circulation. In myocardial infarction, serum AST may begin to rise within 6-8 hours after onset, peak within two days and return to normal by the fourth or fifth day post infarction. An increase in serum AST is also found with hepatitis, liver necrosis, cirrhosis, and liver metastasis.

Alternative Name(s)

AST,SGOT

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided 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 payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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19208W
19208W
822X
19208W
822
822
Aspartate Aminotransferase (AST)
822