Test Catalog

Test ID: CTCCC    
Circulating Tumor Cells (CTC) for Colorectal Cancer by CellSearch, Blood

Specimen Type Describes the specimen type validated for testing

Whole blood

Advisory Information

The CellSearch System is also FDA approved for metastatic breast and metastatic prostate cancer.

-For metastatic breast cancer patients, order CTCBC / Circulating Tumor Cells (CTC) for Breast Cancer by CellSearch, Blood.

-For metastatic prostate cancer patients, order CTCPC / Circulating Tumor Cells (CTC) for Prostate Cancer by CellSearch, Blood.

Shipping Instructions

Specimen must be shipped immediately to ensure processing can be completed within 96 hours of draw. Send specimen Monday through Friday only and not the day before a holiday. Ship specimen overnight in an Ambient Mailer-Critical Specimens Only (T668).


Ship specimen ambient. Do not refrigerate or freeze. Protect from extreme temperatures.

Necessary Information

Date and time of draw are required.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Patient Preparation: Patients on doxorubicin (Adriamycin) must wait a minimum of 7 days after administration before blood can be drawn for this test.


Circulating Tumor Cell Collection Kit (T630)-Required

Ambient Mailer-Critical Specimens Only (T668)

Container/Tube: CellSave tubes only

Specimen Volume: Two 10-mL tubes

Collection Instructions:

1. Collect whole blood in 2 CellSave preservative 10-mL tubes.

2. Collect a minimum of 7.5 mL of whole blood into each tube; tubes cannot be combined; each tube must contain at least 7.5 mL.

3. Immediately gently invert each tube 8 times.

4. Send specimen on same day of draw.

Special Instructions Library of PDFs including pertinent information and forms related to the test


1. Pathology/Cytology Information (T707) in Special Instructions

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

Specimen Minimum Volume Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

7.5 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected


Mild reject; Gross reject






Specimen drawn in a tube other than CellSave tube or submitted in an expired CellSave tube. Specimens > or =96 hours old. Specimens submitted for reasons other than monitoring metastatic colorectal carcinoma

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTime
Whole bloodAmbient4 days