In further detail, in autistic patients, a blood test with analysis of blood count, erythrocyte sedimentation rate (ESR), C-reactive Protein (CRP), autoimmunity test, thyroid function tests, screening for anemia (iron, ferritin, transferrin, B12 vitamin, folic acid), electrolytes, pancreatic, and liver function, lipid profile, and blood sugar levels may be evaluated, especially in patients with eating and feeding disorders or with gastrointestinal symptoms (such as abdominal pain, diarrhea, or constipation). This evidence concerns the gene CRP and anemia (phenotype).