**4. Serum markers in endometriosis**

Levels of CA-125 may be elevated in the serum and peritoneal fluid of women with endometriosis and the concentration of serum CA-125 usually correlate with the severity and the clinical course of the disease. The sensitivity of the serum test is low for the screening of general population, but sensitive in the monitoring the response to hormonal treatment of women with endometriosis. Antiendometrial antibodies are found in 83% of women with confirmed endometriosis and the titers low after hormonal treatment and a good response.
