In recent years, the rate of Neutrophil/Lymphocyte ratio (NLR) has been shown to be a marker of systemic inflammation that associated with prognosis in many diseases like malignancies and chronic inflammatory diseases. Based on previous studies, there is not any finding about NLR and cellular morphological mechanism studied together in inflamation-related diseases; attention deficit hyperactivity disorder(ADHD) and autism spectrum disorders(ASD). We assessed the effect and association of these parameters on ethiopathogenesis of neurodevelopmental disorders. Methods: 30 healthy and 30 each patients who were diagnosed with ADHD and ASD were evaluated at psychiatry department in tertiary hospital. The hemogram profile were analyzed and NLR parameter was statistically evaluated among groups. However, apoptotic stage of cells were staining with 2 different methods. Apoptotic mechanism of ADHD, ASD and control group were comparably displayed. Results: NLR values in patients diagnosed with ADHD and ASD were significantly higher compare to control; lymphocyte count was found significantly lower level in patient groups. Apoptotic morphology becomes evident as degree of disease increment. Conclusions: This parameter can be used as an easily applicable method is estimated to be risk for psychiatric diseases. The positive association of NLR with apoptotic imaging indicates a marker of cellular degradation with neurodegenerative disorders.