The usefulness of carpal tunnel pressures measurement during surgery of carpal tunnel sydrome is documented by the authors. 31 patients underwent endoscopic uniportal approach, the pressure in differnt position (neutral position, flexion and extension in wrist,grip of the fingers) and in defferent levels (distal forearm, proximal,central and distal part of carpal tunnel, palm) was measured. The significant drop of pressure was observed after dissection of ligament in all levels.The results are presented in the form of several graphs.