Circulating Tumor Cell Count
Ordering Recommendation

May use to predict survival in patients treated for metastatic breast, prostate, and colorectal cancers. May use to evaluate response to therapy.

Immunomagnetic Separation/Immunofluorescent Stain/Computer Assisted Analysis
1-5 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
Specimen Required
Patient Preparation
If the patient is on doxorubicin therapy, allow at least 1 week following administration of a dose of doxorubicin before blood draw. 
2 CellSave Preservative tubes (ARUP supply # 44867) available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787. (Min: 8 mL per tube) 
Specimen Preparation
Transport 20 mL whole blood. (Min: 16 mL) 
Storage/Transport Temperature
Room temperature. 
Unacceptable Conditions
Specimens not collected in the CellSave tube or collected in expired CellSave tubes. Short draws. 
Submit with Order: Source of metastatic cancer. This assay is FDA approved only for breast, colorectal, or prostate metastatic cancers; other types will not be tested. 
Ambient: 4 days; Refrigerated: Unacceptable; Frozen: Unacceptable 
Reference Interval
By report
Interpretive Data
Refer to report.

For additional information, refer to the Breast Cancer Management Assays, Prostate Cancer, or Colorectal Cancer topic at

The CellSearch™ Circulating Tumor Cell kit is intended for the quantification of circulating tumor cells (CTC) of epithelial origin for metastatic breast, colon, or prostate cancer, in whole blood. This assay can be used to predict progression free and overall survival in patients treated for metastatic cancer.

The results of a CellSearch™ test should be interpreted with caution if specimens are drawn within 7 days of administration of doxorubicin therapy.
Hotline History
View Hotline History
Component Test Code*Component Chart NameLOINC
0093400Circulating Tumor Cell Number
0093401Patient History - Metastatic Cancer Type63929-4
2007444EER Circulating Tumor Cell Count11526-1
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • Cell Search
  • Circulating Tumor Cells, Breast, Colon, Prostate
  • CTC