What is Glutamate, Urine?
Glutamate is the primary excitatory neurotransmitter of the central nervous system and is simultaneously central to peripheral nitrogen metabolism, the urea cycle, and protein catabolism. Urinary glutamate derives largely from renal tubular amino acid metabolism and dietary protein catabolism rather than central glutamatergic synaptic activity. It serves as the direct biosynthetic precursor to GABA via glutamic acid decarboxylase, making its ratio to urinary GABA the key interpretive metric in Sanesco's inhibitory-excitatory balance framework.