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Background: Attention Deficit Hyperactivity Disorder is a neurodevelopment disorder characterized with symptoms of inattention, hyperactivity and impulsivity. It is know that nearly one sixth of the children diagnosed with ADHD have problems in sensory processing skill at a level to affect the daily life quality. In children diagnosed with ADHD, experiencing sensory processing problem without a certain cerebral lesion, it is shown in researches that neural connections and dopamine has central roles. It is emphasized in studies that objective measurement methods and laboratory findings should be developed to distinguish the bio-markers and sensory processing dysfunctions that may aid in the early diagnosis and treatment stages of ADHD. Methods: In this study 104 children with ADHD diagnosis have participated. The sensory processing skills of the participant who are conforming to the inclusion and exclusion criteria are evaluated with Sensory Profile Test Caregiver Survey. The urea, creatinine, ALT, AST, TSH, free T3, free T4, zinc, folic acid, vitamin D, vitamin B12 and ferritin values in the blood serum level are measured in fasting blood. The relations between the sensory processing skills and blood serum level values are statistically analyzed with Pearson test. Results and Conclusions: Our study had found out that in children with ADHD, the sensory processing skills is related with the folate, vitamin B12, zinc, creatinine values in the blood serum level.