The role of sonography in stable patients suspected of ectopic pregnancy is to establish the diagnosis using positive, suggestive or negative signs. Establishing whether or not intrauterine gestation is present is crucial, as is the detection of any extrauterine abnormality. Sonography may be normal in ectopic pregnancy or when it is not abnormal findings are frequently nonspecific. Therefore, the sonographic results must be correlated and integrated with the clinical history and findings as well as with other diagnostic procedures. The combination of ultrasound scanning with beta hCG was found highly contributory to the determination of the existence of an ectopic pregnancy. During a twenty-month period, 138 patients were examined due to clinical suspicion of “subacute” ectopic pregnancy. Sixty-one patients were managed according to a non-invasive protocol composed of: a) ultrasound scanning alone and b) ultrasound scanning. combined with. serum beta subunit hCG. Ultrasonograms for ectopic pregnancy diagnosis were coded: positive (fluid in cul-de-sac or extrauterine sac); suggestive empty uterus, adnexal mass and pseudo-gestational sac) and negative (intrauterine gestational sac and normal pelvis).