Metabolic Analysis Markers (Urine)

Indoleacetic Acid (IAA)

Optimal Result: 0 - 4.2 mmol/mol creatinine.

A tryptophan metabolite that may be produced by GI bacteria or, rarely, it may be a marker for Hartnup's disease. Supplementation with tryptophan or 5-hydroxy-tryptophan (5HTP) may elevate levels, but a high value does not indicate the need to reduce or eliminate intake. Urine amino acid testing may confirm Hartnup’s disease.

What does it mean if your Indoleacetic Acid (IAA) result is too high?


- Malabsorption of tryptophan
- Hypochlorhydria

Additional Investigations:

- Investigate possible causes of malabsorption
- IP
- IgG Food Sensitivity


- Mucosal support
- Elimination diet
- Betaine HCl
- Digestive enzymes

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