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Test Code C199 CA 19-9

Important Note

This test may be affected by biotin interference. Patients on high dose biotin (5mg/day or more) should not have samples drawn until at least 24 hours after the last biotin administration.

Specimen Type

Plasma

Container/Tube

Li-Heparin, Mint Green Top

Offsite Collection Instructions

1. Collect sample following standard collection methods
2. Within 2 hours of collection the sample must be spun and aliquoted
3. Transport refrigerated (2 – 8˚C).

Turnaround Time

4 hours

Test Includes

N/A

Preferred Volume

0.5 mL

UCMC Collection Instructions

1. Collect sample following standard collection methods
2. Within 2 hours of collection the sample must be received in Laboratory Service Center
3. Transport room temperature (15 – 25˚C).

STAT Turnaround Time

N/A

Test Usage

Immunoassay for the in vitro quantitative determination of CA 19-9 tumor associated antigen, in human serum and plasma. The assay is indicated for the serial measurement of CA 19-9 to aid in the management of patients diagnosed with cancers of the exocrine pancreas. The test is useful as an aid in the monitoring of disease status in those patients having confirmed pancreatic cancer who have levels of CA 19-9 at some point in their disease process exceeding the median concentration determined for the apparently healthy cohort.

Critical Results

N/A

Test Limitations

The measured CA 19-9 value of a patient’s sample can vary depending on the testing procedure used. 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.

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 the 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.

Fee Code

30086301

Stability: Room Temp

2 hours

Stability: Refrigerated

5 days

Stability: Frozen

3 months

Specimen Minimum Volume

0.2 mL

DAY(S) AND TIME(S) PERFORMED

24 hours, 7 days a week including holidays.

STAT DAY(S) AND TIME(S) PERFORMED

N/A

CPT

86301

Method Name

Electrochemiluminescence Immunoassay (ECLIA)

Reference Values

< 37 U/mL

Reject Due To

Whole blood/unspun samples greater than 6 hours will be rejected.

Synonyms

N/A

Additional Information

N/A

Included in Additional codes

N/A

Coverage Information

N/A