An optical blood monitoring system with a ratiometric model determines hematocrit values for a hemodialysis patient, from which hemoglobin values for the patient are estimated. The ratiometric model is calibrated, normally against a cell counter, using blood from a blood bank. The blood from a blood...http://www.google.de/patents/US20100110416?utm_source=gb-gplus-sharePatent US20100110416 - MEASURING HEMATOCRIT AND ESTIMATING HEMOGLOBIN VALUES WITH A NON-INVASIVE, OPTICAL BLOOD MONITORING SYSTEM
