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Cancer antigen 125 is a protein biomarker found to be elevated in some ovarian cancers.  It should be used in conjunction with other diagnostic tools, i.e. the Cancer Profile™©.

The test is useful if the CA-125 level was high when the cancer was first diagnosed. In these cases, measuring the CA-125 over time is a good tool to determine if ovarian cancer treatment is working.


Normal values are <35 U/mL.


Values obtained with different assay methods should not be used interchangeably.

CA-125 Ovarian Tumor Marker