Neurogenetics bridges the disciplines of neuroscience and genetics, exploring how genetic variation shapes the development and function of the nervous system. Increasingly, it is recognized as a foundational field in understanding and managing a wide range of neurological and developmental disorders. What were once enigmatic or untreatable conditions are now understood at the molecular level—opening pathways to targeted diagnostics and therapies. Recognizing neurogenetic diseases early is critical. These conditions often present with characteristic patterns of physical features, developmental delays, or neurological symptoms. Careful clinical evaluation—paired with targeted laboratory studies and neuroimaging—enables early suspicion and identification. The ability to distinguish genetic syndromes through patterns such as facial dysmorphism, tone abnormalities, seizures, or regression is essential for directing further genetic testing and optimizing patient outcomes. Behind these clinical efforts, the laboratory plays an increasingly central role. Next-generation sequencing, metabolic profiling, and other high-throughput technologies are driving an explosion of data that is rapidly advancing our understanding of disease mechanisms. This data-to-diagnosis pipeline is not only improving accuracy and speed of diagnosis but also informing the development of highly targeted treatments. For many disorders that were once fatal in infancy or early childhood, we are now seeing meaningful interventions—ranging from enzyme replacement therapies to gene editing and antisense oligonucleotides—transform the clinical trajectory. This chapter will explore the vital role of clinical observation, diagnostic technologies, and genetic insight in understanding neurodevelopmental disease. It will also examine how expanding laboratory capabilities and genomic data are reshaping the future of diagnosis and treatment, offering real hope to patients and families affected by previously untreatable conditions.