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Test Code BLOD0608 Cancer Antigen 125 (CA 125), Serum

Useful For

CA 125 is a tumor-associated antigen produced by epithelial ovarian carcinoma and is used before and after treatment to check for residual tumor.



Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Serum
Container/Tube: Red top or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL

Collection Instructions: If there is a delay in transport of >8 hours, refrigerate specimen, and send specimen refrigerated.


Specimen Rejection:

1. Specimen other than serum

2. Unfrozen specimen >24 hours old

Specimen Transport Temperature

Ambient <8 hours/Refrigerated <24 hours/Frozen

Specimen Stability


Specimen Type Temperature Time
Serum Ambient 8 hours
  Refrigerated 24 hours
  Frozen 1 month


Reference Values

0-30 U/mL

Day(s) Test Set Up

Monday through Friday

Test Classification and CPT Coding