A child with seizures, developmental regression, movement problems, or a cerebral palsy-like picture may not always fit neatly into a common diagnosis. In some inborn errors of metabolism, the problem mainly affects the central nervous system, and routine blood or urine testing may not show the full picture.
This video explains how cerebrospinal fluid, or CSF, can provide important clues in selected neurometabolic disorders. We discuss CSF glucose and GLUT1 deficiency, CSF lactate and mitochondrial disease, CSF 5-MTHF and cerebral folate deficiency, CSF amino acids such as glycine and serine, BH4-related disorders, and neurotransmitter metabolites such as HVA and 5-HIAA.
CSF testing is not a routine screening test, and it does not replace blood, urine, MRI, genetic testing, or specialist evaluation. But in the right clinical setting, it can help doctors trace the pathway behind drug-resistant epilepsy, developmental regression, abnormal movements, oculogyric crises, white matter changes, basal ganglia findings, or symptoms that worsen with fasting, infection, fatigue, or exercise.
This video is for educational purposes only and cannot replace medical diagnosis or treatment. Decisions about lumbar puncture, CSF metabolic testing, medication management, and interpretation of results must be made by qualified medical professionals.