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Test Catalog

Test ID: CTCP    
Circulating Tumor Cells (CTC) for Prostate Cancer by CellSearch, Blood

Specimen Type Describes the specimen type needed for testing

Whole blood

Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.

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 (Supply T668).


Container/Tube: CellSave tubes only

Specimen Volume: Two 10-mL tubes

Collection Instructions:

1. Use the Circulating Tumor Cell Collection Kit (Supply T630).

2. Draw whole blood in 2 CellSave preservative 10-mL tubes.

    - Draw a minimum of 7.5 mL of whole blood into each tube.

3. Immediately gently invert each tube 8 times.

4. Send specimen on same day of draw.

Additional Information: 

1. Date and time of draw are required.

2. Stabile at 15 to 30 degrees C for 96 hours. Ship specimen ambient. Do not refrigerate or freeze. Protect from extreme temperatures.

3. Tubes cannot be combined; each tube must contain at least 7.5 mL.

Forms: If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

Pathology Test Request Form (T246) (

Oncology Test Request Form (T729) (

Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.

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 prostatic carcinoma.


Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.

Specimen TypeTemperatureTime
Whole bloodAmbient4 days