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/US8130369?utm_source=gb-gplus-sharePatent US8130369 - Measuring hematocrit and estimating hemoglobin values with a non-invasive, optical blood monitoring system
