Days Set Up
Analytic Time

2 - 8 days

Soft Order Code

Test Updated:


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Test Overview

Test Methodology

Qualitative Colorimetry

Test Usage

Indole is produced by bacterial action on tryptophan in the small intestine. Most is eliminated in the feces; the remainder is absorbed and detoxified in the liver and excreted as indican (indoxyl sulfate) in the urine. The amount of indican normally excreted in the urine is small. However, large amounts are produced as a results of high protein diets and in various disorders such as Hartnup disease, intestinal obstruction, gastric cancer, hypochlorhydria, biliary obstruction, and malabsorptive conditions such as sprue and blind-loop syndrome.

Reference Range


* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect random urine with no preservatives. Mix well, transfer two 4 mL aliquots (minimum 3 mL) into plastic transport tubes, and freeze.

Normal Volume
9 mL urine (divided into 2 4.5 ml aliquots)
Minimum Volume
3 mL urine

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.