A system for determining a biologic constituent including hematocrit transcutaneously, noninvasively and continuously. A finger clip assembly includes including at least a pair of emitters and a photodiode in appropriate alignment to enable operation in either a transmissive mode or a reflectance mode....http://www.google.com.au/patents/US20040127779?utm_source=gb-gplus-sharePatent US20040127779 - Method and apparatus for non-invasive blood constituent monitoring
