The use of perforator flaps all over the body, as free microsurgical transfers, as well as pedicled or transposition flaps gained more and more importance in the surgery of tissue defects. When we consider harvesting such flaps at trunk level, in repeatedly traumatized areas, after previous surgery or when we plan to use the perforator flap as a free flap, it is very important to perform preoperative investigations aimed to precisely localize the perforator or perforators able to sustain such a flap. But, at limb level and, especially, at forearm level, the preoperative investigations cannot always have a complete justification. After a short review of the main preoperative investigations used in flap surgery and considering our color Doppler study, we will present in this article our technique of performing such flaps in the forearm, without any preoperative perforator vessel detection.