Patent ID: 7186217

Claim:
A biological photometer comprising a light source which generates light being irradiated to a subject, a photometer unit which detects light transmitted inside the subject and produces a hemoglobin signal corresponding to hemoglobin density inside the subject, and a signal processing unit which prepares hemoglobin variation information of the subject based on the hemoglobin signal and displays the hemoglobin variation information, characterized in that the signal processing unit is provided with a memory unit which stores characteristics of hemoglobin variation patterns of respective normal health and a variety of diseases as reference templates, a characteristic extraction unit which extracts characteristics of a hemoglobin variation pattern of the subject based on the hemoglobin signal produced by the photometer unit, and a judgment unit which judges normal health or a kind of disease of the subject through comparison between the extracted characteristics of the hemoglobin variation pattern and respective reference templates of the normal health and the variety of diseases stored in the memory unit.