The method of diagnosing the brain blood vessel automatic adjustment function of the patient has, the stage which measures the blood pressure of the patient and the stage which measures the blood pressure substantially simultaneously, the stage which judges the brain blood vessel automatic adjustment state of the patient oxygen content of the vein of the brain of the patient measurement value of oxygen content of stage and the blood pressure and the vein which non view blood are measured correlation are attached on the basis of the correlation attaching of measurement value of oxygen content of stage and the blood pressure and the vein which in the time domain, and.< Selective figure > Figure 1患者の脳血管自動調節機能を診断する方法は、患者の血圧を計測する段階と、血圧を計測する段階と実質的に同時に、患者の脳の静脈の酸素含有量を非観血的に計測する段階と、血圧および静脈の酸素含有量の計測値を時間領域で相関付ける段階と、血圧および静脈の酸素含有量の計測値の相関付けに基づいて、患者の脳血管自動調節状態を判断する段階と、を備える。【選択図】 図1
