The TrueHb Hemometer System is intended to be used for the quantitative measurement of hemoglobin in fresh capillary whole blood samples taken from the forearm, upper arm, hand, thigh, calf, or fingers. The TrueHb Hemoglobin Monitoring System is intended for use outside the body (in vitro diagnostic use) by healthcare professionals and individuals. It should not be used for diagnosis of diseases or for on newborns.

The TrueHb Hemometer System is based on the principle of reflectance photometry. A drop of blood is applied to the strip. It disperses within the hydrophilic mesh. The hemoglobin is extracted out from the RBC and, with the help of reagents present in the strip, is converted into a complex. The optical reflectance is measured which is inversely proportional to the concentration of hemoglobin in the blood sample. This corresponds to the total hemoglobin present in blood.