A system for measuring physiological aspects has a non-invasive monitor configured to generate monitor signals relating to fluid characteristics in the head and body. A computational device is operatively connected to the monitor and is configured to process the monitor signals to generate characterizing data relating to at least one of regional fluid volumes, intra/extracellular fluid volume ratios and blood flow. A data output device is connected to the computational device and is configured to output the characterizing data. A method and a computer program product for recording, measuring, and displaying physiological characteristics are also provided.