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There is no reference interval for arsenic in urine, for two independent reasons. First, no health-based limit can exist: inorganic arsenic is a genotoxic carcinogen, and no safe threshold is definable for such substances. The German HBM Commission therefore published only a background-exposure reference value and explicitly no health-based value; EFSA has used a margin-of-exposure approach since 2024 for the same reason. Second, total urinary arsenic is not interpretable on its own: arsenobetaine from fish and shellfish is harmless but raises the result several-fold for days. A result without speciation therefore mostly reflects what you recently ate. Discuss your result with your doctor; we do not state a number we cannot substantiate.