Laser therapy in gynecology and obstetrics is well established. CO2 laser devices are used in the treatment of vulvarand cervical lesions such as condylomata acuminata and intraepithelial neoplasia.The main advantage is a better cosmetic result(noscars,very accurate preparation). Nd:YAG laser energy can be used for endometrium ablation but the main focus lies on the treatment of twin-to-twin transfusion syndrome in monochorionic twins.The application of laser therapy in gynecology and obstetrics is being progressively challenged by the development of high-frequency electric surgery. In the early 90s,coagulation by laser was considered to be the gold standard in gynecology and obstetrics. With the enormous improvements in high-frequency electric surgery,the clinical focus may change away from the laser towards high-frequency electric surgery . Concerning clinical handling and practicability at our department high-frequency electro surgery has proven as the method of choice for endoscopic ablative procedures. In hysteroscopic surgery high-frequency electric surgery can be considered as an equivalent alternative to laser, where as the treatment of vulvar and cervical lesions as well as intrauterine therapy of twin-to-twin transfusion syndrome is still considered to be advantageous using laser energy.