The Greyledge Method of Ratios app lets busy medical professionals get patient-specific values for ratios that can be used at a glance to assess the quality of their patient’s Platelet-rich Plasma or Bone Marrow Concentrate sample. For example, the ratio of platelets to red blood cells tells you how good the reduction process was in getting rid of the red blood cells. You need to have hemoanalytic data in order to use this App.