• Nutritional assessment: evaluation of dietary protein adequacy and amino acid balance.
• Digestive considerations: exploration of maldigestion or malabsorption patterns.
• Micronutrient status: indirect insight into vitamin and mineral cofactors linked to amino acid metabolism, such as B6, B12, folate, zinc and magnesium.
• Metabolic workload: review of amino acids involved in detoxification and oxidative pathways.
• Renal and hepatic context: observation of amino acid handling in urine.
• Neurochemical precursors: assessment of amino acids linked to neurotransmitter pathways.
• Cardiometabolic markers: observation of metabolites such as homocystine.
• Comprehensive functional review: part of a broader nutritional and metabolic workup.

Overview

The Urine Amino Acids test measures a broad panel of amino acids and related metabolites in urine, collected either over 24 hours or from a first morning void. Urine-based analysis reflects amino acid availability across the day and may highlight early shifts in nutrient adequacy, as healthy kidneys typically conserve essential amino acids efficiently.

A 24-hour collection provides a day-long overview and is less influenced by circadian variation, while a first morning void offers a practical alternative when full collection is not feasible. Results are typically reviewed in relation to dietary intake, digestive function, micronutrient cofactors and metabolic demands.

Findings are presented in a functional format to support interpretation and may be considered alongside clinical history, dietary patterns and other laboratory data as part of a wider nutritional assessment.

Practical

This test can be collected either in the morning (first morning void), or as a 24 hour collection.

The 24-hour urine amino acid analysis has the highest probability of detecting abnormalities if renal function is normal. The 24-hour test indicates what is high and low over the course of a day, reflects blood and tissue amino acid pools, and is not affected by circadian rhythm. Healthy kidneys efficiently conserve essential amino acids. Therefore, urine levels of amino acids decrease first and tend to give an earlier indication of inadequacy than do plasma levels.

A first morning void urine (FMV) amino acid analysis, with results normalized per gram creatinine, provides an alternative when a complete 24-hour collection is not a viable option. The FMV analysis is excellent for identification of marked abnormalities, particularly with respect to gastrointestinal health, inherited disorders in amino acid metabolism and renal function, and can be used for protein challenge testing.

1 x Specimen vial with oxalic acid powder*