A device and method for continuous identification and screening of diabetes using Photo-Plethysmogrpahy (PPG) signal. The invention operates in two phases 1) Training phase and 2) Probe Phase. In the training phase the invention acquires a PPG signal by monitoring arterial pulse palpation from a control group of individuals. The acquired signal is amplified and noise is removed, the signal is then converted into digital format and sampled at a predefined frequency to generate a preprocessed signal. This preprocessed signal is analyzed using harmonic analyses, and features of the signal are extracted and used as database set. In the probe phase, PPG signal is acquired from an individual under test. The acquired PPG signal undergoes preprocessing and analyzed using harmonic analysis and features are extracted. The features extracted in both phases are matched to classify the individual under test as a normal, a pre-diabetic or a diabetic individual.
