What does the GABA (γ-Aminobutyric Acid), Urine test measure?

Why is GABA (γ-Aminobutyric Acid), Urine measured?

In Sanesco's framework, urinary GABA is interpreted in relation to urinary glutamate as a proxy for the peripheral inhibitory-to-excitatory balance, informing supplementation with GABA precursors, B6, magnesium, L-theanine, and taurine in patients with anxiety, sleep disturbance, muscle tension, and stress reactivity. Low GABA relative to glutamate in functional medicine is associated with a pattern of excitatory dominance. Practitioners should communicate the blood-brain barrier limitation clearly — oral GABA supplementation does not directly enter the CNS under normal physiological conditions, and peripheral urinary GABA does not represent central GABAergic inhibitory function.

Reference ranges

Standard reference

# REVIEWER FLAG: Confirm Sanesco reference range for urinary GABA — highly platform-specific.

Functional medicine optimal

# REVIEWER FLAG: Confirm Sanesco optimal range designation.

Units

µg/g creatinine

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.