Geisinger Medical Laboratories Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB2493             Geisinger Epic ID: 19453

Specimen type:
Serum or plasma
Preferred collection container:
Alternate Collection Container:
4 mL green/green-top (sodium heparin) tube
3 mL lavender-top (K2 EDTA) tube
Specimen required:
1 mL serum or plasma; minimum 0.5 mL.

Specimen processing instructions:
Place the specimen in a refrigerator or ice bath for 30 minutes after collection. Centrifuge the specimen as soon as possible after complete clot formation has taken place. Centrifuge and aliquot. 
Transport temperature:
Specimen stability:
Room temperature: 4 days, Refrigerated: 14 days, Frozen: 6 months.
Rejection criteria:
Gross hemolysis • Unseparated serum or plasma • Whole blood specimens • Grossly lipemic.

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:
Homocysteine value.
Quest test code 31789, HOM, HCY
Clinical significance:
An elevated concentration of homocysteine is an independent risk factor for cardiovascular disease. When used in conjunction with methylmalonic acid (MMA), these tests are useful to diagnose and monitor vitamin B12 (cobalamin) and folic acid deficiency and are often useful in evaluating macrocytosis (an elevated MCV, an erythrocytic index).

Performing Locations

Quest Diagnostics

Technical Lead: Michael Weaver    
Frequency: Set up: Monday-Fridaiy night. Report available: Next day.    
Performed STAT? No
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