This book focuses on promising new biomarkers for diagnosing and treating Autism Spectrum Disorder (ASD). It explores genetic, immunologic, and metabolic markers, including those related to oxidative stress and mitochondrial dysfunction. The book also examines current limitations-such as small sample sizes and lack of specificity-and discusses future applications like multiplex immunoassays and machine learning. Its ultimate aim is to clarify these tools' potential and complexities in developing personalized treatment strategies.