Urine Valine

Urine Valine measures the amount of valine, an essential branched‑chain amino acid, that your body excretes in urine. Because urine can be more or less concentrated depending on how much you drink, the result is typically adjusted to creatinine, which helps make results more comparable between samples.

This test is often part of a quantitative urine amino acid profile performed by chromatography or mass spectrometry. It helps your clinician assess how your body is processing amino acids and can provide clues about inherited metabolic conditions and nutritional status.

Valine levels in urine can change when the body has trouble breaking down branched‑chain amino acids, during periods of illness or fasting, or when protein intake is unusually high or low. Doctors may order this test to help evaluate suspected inborn errors of metabolism, to follow up on an abnormal newborn or genetic screen, or to monitor dietary therapy in known metabolic disorders.

Results can also inform nutritional assessment and help guide adjustments to diet, supplements, or medications. Interpreting urine valine alongside other amino acids and related metabolites gives a fuller picture of what is happening in your body.

Your clinician will interpret your result using age‑specific reference intervals and by looking at patterns with other amino acids, especially leucine and isoleucine. A single unexpected value may be rechecked, since hydration, recent meals, or illness can shift results.

If your level is outside the expected range, next steps may include repeat testing, plasma amino acids, urine organic acids, or genetic evaluation, depending on your history and symptoms. Management may involve dietary changes, adjusting supplements, or treatment for an underlying condition. Your care team will explain what your specific result means for you and whether any follow‑up is needed.