Cancer Antigen 19-9

Last Modified: 2/13/2019 2:58:44 PM

  Medicare Medical Necessity Restrictions May Apply
Medical Necessity Documentation:
Client Notes:  
Patient Preparation: Patient should discontinue taking Biotin, Vitamin B7, or Vitamin H 48 hours before getting blood drawn.
Specimen Requirements: 1.0 mL Serum in a SST Gold Top Tube
Collection Instructions:  
Minimum Volume: 0.5 mL
Transport & Storage: Temperature/Stability: 8 hours Ambient
48 hours Refrigerated
Rejection Criteria: Glass Tubes
Reference Range: CA 19-9: <35 U/mL
Critical Ranges:  
Test Comments: This test was performed using the Roche Cobas 8000. Values obtained with different assay methods cannot be used interchangeably, because the concentration of CA 19-9 in any given specimen can vary, due to differences in assay methods and reagent specificity. Serum CA 19-9 levels, regardless of value, should not be interpreted as absolute evidence of the presence or absence of malignant disease.

Patients taking vitamin supplements containing doses of >5 mg/day may have falsely decreased test results generated.
Methodology: Immunochemiluminometric Assay ECLIA
Clinical Significance: A large percent of patients with gastrointestinal tumors (such as pancreative, liver, gastric,  colorectal tumors) and some other malignancies have been shown to have elevated serum or plasma CA 19-9 levels may be useful for monitoring disease activity predicitng replaps following treatment. CA 19-9 should not be used as a screening test.
Custom Panel: No


Days Performed: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
Sites Performed: Parkview Regional Medical Center
PHL Test Code: CA199
EPIC Test Code: IMO407
Alternate Test Names: CA 19-9; Carbohydrate Antigen 19-9
Included Tests:  
CPT Coding: 86301

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