Carbohydrate Antigen 19-9 (CA 19-9)

Label Mnemonic:	CA199
Epic code:	LAB2792
Downtime form:	A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery

Chemistry
6240 RCP
356-3527

Specimen(s):

Plasma

Collection Medium:

Plasma Separator Tube 4.5 mL

Alternate Collection Media:

Call laboratory for additional acceptable specimen collection containers.

Minimum:

3 mL whole blood in light green top tube or TWO Microtainer^® devices

Delivery Instructions:

Deliver to laboratory within 1 hour of collection.

Testing Schedule:

24 hrs/day, 7 days a week, including holidays.

Turn Around Time:

1 hour (upon receipt in laboratory)

Reference Range:

0.0 - 34 U/mL

Comments:

This assay may be significantly impacted by high-dose biotin (>5 mg dose) taken within previous 12 hours. High concentrations of biotin may lead to falsely decreased results. These concentrations may be found in patients taking over-the-counter supplements with biotin content much higher than nutritional requirements for biotin. Specimens should not be collected until at least 12 hours after the last dose.

Test Limitations:

Hemolysis=2200, Icterus=66, Lipemia=1500

Methodology:

Electrochemiluminescence Immunoassay (ECL)

CPT Code:

86301

See Additional Information:
Biotin Interference with Immunoassays