Cancer antigen 125 (CA125) is a protein produced by a variety of cells, particularly ovarian cancer cells. It is found in trace amounts in the pleura, pericardium and peritoneum of healthy adults.
A CA125 test may be done to:
This test is not currently used as a screening test for ovarian cancer because:
A CA125 test is usually done in a private laboratory or hospital laboratory. No special preparation is usually needed.
An increased CA125 value can occur in non-cancerous and cancerous conditions.
In cancerous conditions:
The doctor will decide if more tests, procedures, follow-up care or additional treatment is needed.
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