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Test Code 199PC Carbohydrate Antigen 19-9 (CA 19-9), Pancreatic Cyst Fluid

Reporting Name

CA19-9, Pancreatic Cyst

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

As an adjunct in the assessment of pancreatic cysts, when used in conjunction with carcinoembryonic antigen, amylase, imaging studies and cytology

Method Name

Immunoenzymatic Assay


Ordering Guidance


This test should not be ordered for pancreatic fluid of noncystic origin (eg, pancreatic duct fluid, peripancreatic fluid) since reference values have not been established for those specimen types. For ordering assistance call 800-533-1710.



Additional Testing Requirements


This test has limited utility when used as the sole tumor marker test. Additional tests should be performed (CEAPC / Carcinoembryonic Antigen (CEA), Pancreatic Cyst Fluid; AMLPC / Amylase, Pancreatic Cyst Fluid, and cytology testing) in conjunction with this test for assessing pancreatic cyst aspirates.



Specimen Required


Patient Preparation: For 12 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).

Source: Pancreatic cyst or pancreatic pseudocyst

Container/Tube: Plain, plastic, screw-top tube

Specimen Volume: 1 mL


Specimen Type

Pancreatic Cyst Fluid

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Pancreatic Cyst Fluid Frozen (preferred) 90 days
  Refrigerated  7 days
  Ambient  72 hours

Reject Due To

Gross hemolysis Reject
Gross icterus OK

Reference Values

An interpretive report will be provided.

Interpretation

Cyst fluid carbohydrate antigen 19-9 (CA19-9) concentrations less than 37 U/mL indicate a low risk for a mucinous cyst and are more consistent with serous cystadenoma or pseudocyst. The sensitivity and specificity are approximately 19% and 98%, respectively, at this concentration.

 

Correlation of these test results with cytology and imaging is recommended.

Day(s) Performed

Monday through Friday

Report Available

1 to 3 days

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

86301

LOINC Code Information

Test ID Test Order Name Order LOINC Value
199PC CA19-9, Pancreatic Cyst 97750-4

 

Result ID Test Result Name Result LOINC Value
199P CA19-9, Pancreatic Cyst 97750-4
SITE6 Site 39111-0

Forms

If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.