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The proposed work is to design and develop an algorithm to evaluate the total haemoglobin level in the blood. The doctors should have a track of the haemoglobin level of their patients in hospitals because it plays a vital role during delivery, operations, monitoring patients in Intensive Care Units (ICU), donation of blood etc. At present the measurement of haemoglobin is a strenuous process as it is done using invasive methods and it might cause infections & is painful. In this approach a finger probe with five LED's and a Photodetector is used. The output voltage from the photodetector is passed through a signal conditioning amplifier (to eliminate noise and to enhance the voltage signal). The acquisition of signal from the finger is done through the Photoplethysmography (PPG) principle. The non-invasive method can be used over invasive methods because it is painless, infection free and the real-time results are obtained. The accuracy of the device is compared with the haemoglobin level measured from a pathological laboratory. haemoglobin is measured in g/dl (grams per decilitre).
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