The doctor, after taking a detailed history, proceeds to a gynecological examination to exclude other causes with similar symptoms (simple cysts). Intravaginal ultrasound MRI scan can provide reliable information. However, the only reliable method of diagnosis is surgery (laparoscopy and histological examination). In contrast, the CA 125 index, which we can see with a blood test, is not reliable, as it does not always rise. After the diagnosis, the doctor is able to know the extent of the disease. There are stages 1, 2, 3 and 4, which refer to minimal, light, moderate and severe endometriosis, respectively.