Geisinger Medical Laboratories Test Catalog

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


Geisinger Epic Procedure Code: LAB2933             Geisinger Epic ID: 19492

Specimen type:
Plasma (platelet-poor)
Preferred collection container:
Specimen required:
1 mL aliquot of plasma; minimum 0.4 mL. Please submit a separate frozen aliquot for this test. It may not be combined with any other test requiring a frozen aliquot.
Special notes:
Specimen can only be collected in a 3.2% sodium citrate tube. See Specimen Processing Instructions.

Specimen processing instructions:
Centrifuge within one hour of collection. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. 
Transport temperature:
Frozen. Ship frozen sample on dry ice.
Specimen stability:
Room temperature: Unacceptable. Refrigerated: Unacceptable. Frozen (-70°C or lower): 30 days. Frozen (-20°C): 14 days.
Rejection criteria:
Shipping room temperature or refrigerated is unacceptable. Specimen cannot be collected in a 3.8% sodium citrate tube. Gross hemolysis.

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:
Protein C antigen.
Enzyme Immunoassay (EIA)
PROTCA, Quest test code 4948
Clinical significance:
Aids in diagnosis of congenital deficiencies characterized by recurrent venous thrombosis. Acquired deficiencies associated with Protein C include: oral anticoagulant therapy, liver disease, vitamin K deficiency, malignancy, consumptive DIC, surgery, trauma, antibodies to Protein C and hepatic immaturity of the newborn.

Performing Locations

Quest Diagnostics

Technical Lead: Michael Weaver    
Frequency: Set up: Sunday, Tuesday-Friday. Report available: 1-4 days.    
Performed STAT? No
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