What is the reference range for Iodine (Urine)?

The standard reference range for Iodine (Urine) is WHO adequacy threshold ≥100 µg/L; population median 100–299 µg/L indicates sufficiency.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Biomarker Reference · I

What does the Iodine (Urine) test measure?

Q: Which tests measure Iodine (Urine)?

Iodine (Urine) is measured in 2 tests on BiomarkersLabs.com, including Blood Spot + Dried Urine ICPMS Toxic and Essential Elements, Blood Spot Thyroids + Dried Urine ICPMS Toxic and Essential Elements.

Iodine (Urine) (I) is a clinical biomarker used in heavy-metals-toxicology assessment. Iodine is concentrated by the thyroid for thyroid-hormone synthesis; excess is rapidly excreted in urine, so urinary iodine reflects very recent dietary intake (past day or two). It is measured in 2 laboratory tests on BiomarkersLabs.com.

Reference Range: WHO adequacy threshold ≥100 µg/L; population median 100–299 µg/L indicates sufficiency.
Units: µg/L, µg/g creatinine
Measured In: 2 tests
Category: Heavy Metals

Functional medicine optimalWHO criteria define sufficiency as a population median 100–199 µg/L (pregnancy 150–249 µg/L); individual optimal ranges are less well established and vary by reproductive status.

What is Iodine (Urine)?

Iodine is concentrated by the thyroid for thyroid-hormone synthesis; excess is rapidly excreted in urine, so urinary iodine reflects very recent dietary intake (past day or two). Because of high day-to-day variability, a single spot-urine iodine is an imprecise marker of individual status, though it is the standard method for population surveillance.

Why is Iodine (Urine) measured?

Urinary iodine is used to screen for deficiency or excess in populations and to guide iodine supplementation in pregnancy. In individuals, it must be interpreted cautiously — a low value on one occasion may not reflect chronic deficiency, and very high values can occur after iodine-containing contrast or supplement loading.

Reference ranges

Standard reference: WHO adequacy threshold ≥100 µg/L; population median 100–299 µg/L indicates sufficiency.
Functional medicine optimal: WHO criteria define sufficiency as a population median 100–199 µg/L (pregnancy 150–249 µg/L); individual optimal ranges are less well established and vary by reproductive status.
Units: µg/L, µg/g creatinine

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Iodine (Urine)

2 tests on BiomarkersLabs.com include this biomarker.

BML-HMT-009Comprehensive

Blood Spot + Dried Urine ICPMS Toxic and Essential Elements

Iodine (Urine) reference range in this test: ZRT laboratory-specific; WHO population median ≥100 µg/L indicates iodine sufficiency.

BML-HMT-011Comprehensive

Blood Spot Thyroids + Dried Urine ICPMS Toxic and Essential Elements

Iodine (Urine) reference range in this test: WHO adequacy threshold ≥100 µg/L; population median 100–299 µg/L indicates sufficiency.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Arsenic (Urine)As3 tests Mercury (Blood)Hg3 tests Lead (Blood)Pb3 tests Cadmium (Blood)Cd4 tests Selenium (Blood)Se2 tests Zinc (Blood)Zn3 tests Copper (Blood)Cu3 tests Magnesium (Blood)Mg1 test

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