Abstract: This paper describes various method of measurement of glucose concentration in the human blood non-invasively. In recent medical practice, the concentration of glucose in blood is measured using an invasive techniques which generally involves puncturing finger. In generic few ml of blood whereas in recent practice less than a drop of blood is taken out and passed through the standard chemical tests to measure glucose concentration. These methods are expensive as well as painful. The frequent finger puncturing causes calluses on the skin and also increases the risk of spreading infectious diseases. So, the development of a non-invasive blood glucose measurement system will be boon to the diabetic patients. This paper describes the method of blood sugar measurement in the human blood non-invasively with various technique. The measurement accuracy of the non-invasive measurement device plays vital role and with noise filtering techniques.

Keywords: Non-invasive techniques, blood glucose measurement, near infrared.