LabCorp Test

Carbohydrate Antigen (CA) 19-9 Blood Test

Quick Overview

Used to monitor pancreatic, liver, gastrointestinal, and colorectal malignancies.

Test #002261


Availability: In stock

Also Known As CA 19-9; Cancer Antigen-GI; CA-GI
Preparation No fasting required. Stop biotin consumption at least 72 hours prior to the collection.
Test Results 1-2 days. May take longer based on weather, holiday or lab delays.

The determination of CA 19-9 can't be used for the early detection of pancreatic carcinoma. Three to seven percent of the population have the Lewis a-negative/b-negative blood group configuration and are therefore unable to express the mucin with the reactive determinant CA 19-9. Patients who are 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 can be insufficient to detect true Lewis antigen-negative individuals. Even genotype positive patients for the Lewis antigen may produce varying levels of CA 19-9 as the result of gene dosage effect. This factor must be taken into account when interpreting the findings. For diagnostic purposes, results should be assessed in conjunction with the patient's medical history, clinical examination, and other findings.

Trusted, Secure, & Confidential

Please wait...