Non-Invasive Techniques for Detection of Hemoglobin in Blood:A Review

Hemoglobin is the most important blood parameter. Hemoglobin is the protein in red blood cells that carry oxygen to the body. Low level of hemoglobin can be due to disease like anemia and high hemoglobin level may be due to polycythemia Vera. Conventional methods are mostly used to calculate hemoglobin level. These methods involve pricking of blood with needle and sending it to laboratory for further analysis this result in delay and chances of infection. Now a day’s many non invasive techniques such as colour analyses, pulse oximetry and photoplethysmography has been evolved that can be used to determine hemoglobin level in blood non-invasively. This paper gives review of the work has been done in this field. The proposed work deals with the utilizing the non invasive technique like pulse oximetry and design a portable, simple, low cost and easy to operate device to determine hemoglobin in real time. Keywords— Non-invasive hemoglobin level detection techniques; pulse oximetry; colour analyses; PPG.