Geisinger Proven Diagnostics Test Catalog

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Search by: Test Name: or Test Code or CPT Code:


Test code:
Specimen type:
Plasma or Serum*
Tube type / collection container:
Specimen collection notes:
All stat/line draw requests: Plasma separator tube.
All routine requests/off-site specimens: Serum separator tube.
What to submit:
2 mL of serum or plasma; minimum 0.2 mL.
Patient preparation:
Specimen Processing Instructions:
Allow serum to clot. Centrifuge serum or plasma at 1100-2000 g for a minimum of 10 minutes. 
Transport temperature:
Refrigerated (preferred). Room temperature or frozen specimens also acceptable.
Specimen stability:
Room temperature: 2 days. Refrigerated: 7 days. Frozen: 3 months.
Rejection criteria:
Stability limits exceeded.
Reference range:
0 - <1 yr: <49
> 1 yr: Male: 10-50. Female: 10-35.
Alert limits:
Above 500 U/L.
Additional information:
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Alanine aminotransferase (ALT)
Spectrophotometric (Colorimetric)
Clinical Significance:
ALT is useful in the diagnosis and management of certain liver disorders such as viral hepatitis and cirrhosis. Signfiicant elevations of ALT occur in diseases of the liver and hepatotoxicity.
Doctoral Director Review:
Jay Jones Ph.D.    02/04/2014

Performing Locations

Geisinger Medical Center

Performing laboratory: Automated Chemistry
Doctoral director: Jay Jones Ph.D.
Technical specialist: Larry Quinton
Frequency: Daily, Monday - Sunday
Performed stat? Y
Review/ revision date: 02/04/2014
Reviewed/revised by: Larry Quinton

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Doctoral director: Jay Jones Ph.D.
Technical specialist: Melissa Whetstone    
Frequency: Daily, all shifts    
Performed stat? N
Review/ revision date: 12/03/2013    
Reviewed/revised by: Melissa Whetstone