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Test Code Ca 19-9 Ca 19-9

Aliases

Carbohydrate Antigen 19-9

Useful For

Aids in the diagnosis of Pancreatic Cancer

Patient Preparation

No special patient preparation required

Collection Method

Venous collection

Minimum Volume

  • Adults: 1 mL
  • Pediatric: 0.8 ml

Container

Lt Green / Plasma Separator / Lithium Heparin

Preferred Specimen

Light Green Top (lithium heparin) plasma

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top

Plasma:

  • Light Geen Top (lithium heparin)
  • Purple or Pink Top (K2/K3 EDTA)

 

Reference or Target Ranges

2 – 35 U/mL

Reportable Units

U/mL

Critical Value

Not defined for this assay

Reasons for Rejection

Hemolysis Threshold 1000 mg/dL
Icterus Threshold 66 mg/dL
Lipemia Threshold 1500 mL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

Ambient 5 days
Refrigerated (4°C to 8°C) 14 days
Frozen(-40°C to 0°C) 3 months

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Routine: 4 hours from arrival in lab
Stat Availability No
Performing Bench UH Chemistry, WCH Chemistry
Methodology/Method Description Roche Cobas – Two site immunoenzymatic sandwich assay

Ca 19-9 values determined on patient samples by different testing procedures cannot be directly compared with one another and could be the cause of erroneous medical interpretations.

 

Additional Information/Important Notes

Important Note:
Patients known to be genotypically negative for Lewis blood group antigens will be unable to produce the CA 19-9 antigen even in the presence of malignant tissue. Phenotyping for the presence of Lewis blood group antigen may be insufficient to detect true Lewis antigen negative individuals. Even patients who are genotype positive for the Lewis antigen may produce varying levels of CA 19-9 as the result of gene dosage effect.

CPT Codes

86301