Cancer Antigen 125 (CA-125)

Oncology

Normal Reference Ranges

Adult

< 35 U/mL

Pediatric

N/A U/mL

Clinical Significance

Not recommended for general screening due to low specificity. Primarily used to monitor response to therapy or detect recurrence in known Ovarian Cancer.

Causes of High

  • Ovarian cancer
  • Endometriosis
  • Pelvic Inflammatory Disease (PID)
  • Pregnancy
  • Cirrhosis

Causes of Low

  • Normal finding
  • Successful ovarian cancer treatment