Urine Taurine

The urine taurine test measures the amount of taurine your kidneys excrete. Taurine is a sulfur‑containing compound often grouped with amino acids. It supports bile acid conjugation, eye and heart function, cell volume regulation, and antioxidant defenses.

Your body gets taurine from your diet and also makes some on its own. The kidneys normally reabsorb most amino acids and related compounds, so only a small portion appears in urine. This test is performed on a spot or 24‑hour urine sample, sometimes alongside other amino acids, and may be reported as a concentration or adjusted to urine creatinine.

Changes in urinary taurine can reflect nutrition, supplement use, and how well the kidney’s proximal tubules reabsorb amino acids. High levels may occur with heavy taurine intake, use of energy drinks or supplements, or with tubular injury and generalized aminoaciduria. Low levels can be seen with low intake, impaired absorption, or certain metabolic conditions.

Clinicians may order this test when evaluating possible inborn errors of metabolism, suspected tubular disorders such as Fanconi syndrome, or to monitor nutritional status in infants or people receiving specialized nutrition. It can also complement plasma amino acid testing when symptoms or family history suggest a metabolic or renal tubular problem.

Your result is interpreted in the context of age‑specific reference ranges and the type of collection used. Laboratories may report taurine as a concentration or as a value normalized to urine creatinine to account for urine dilution. Hydration, recent diet, and supplements can influence results, so your clinician will consider these details.

If your level is outside the expected range, your clinician may suggest repeating the test, obtaining a 24‑hour collection, or performing follow‑up evaluations such as plasma amino acids, standard kidney tests, and other urine studies. Do not start or stop supplements without medical advice. For children, rapid growth and different renal handling can affect interpretation, and pregnancy can also change amino acid handling, so discuss context and next steps with your care team.