What is the reference range for Creatinine (Urine)?

The standard reference range for Creatinine (Urine) is 20–300 mg/dL (varies with muscle mass, hydration, and sex). Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Creatinine (Urine)?

Creatinine (Urine) is measured in 1 test on BiomarkersLabs.com, including EnviroTOX Complete + Metals.

Biomarker Reference · Cr

What does the Creatinine (Urine) test measure?

Creatinine (Urine) (Cr) is a clinical biomarker used in heavy-metals-toxicology assessment. Creatinine is a breakdown product of creatine phosphate in muscle, excreted in urine at a relatively constant rate. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: 20–300 mg/dL (varies with muscle mass, hydration, and sex)
Units: mg/dL, mmol/L
Measured In: 1 test
Category: Heavy Metals

Functional medicine optimalWithin the reportable range (20–300 mg/dL) for valid correction.

What is Creatinine (Urine)?

Creatinine is a breakdown product of creatine phosphate in muscle, excreted in urine at a relatively constant rate. Urinary creatinine is used to normalise spot urine concentrations of analytes (expressed as µg/g creatinine) to account for urine dilution or concentration, though it is imperfect in very dilute (<20 mg/dL) or very concentrated (>300 mg/dL) samples.

Why is Creatinine (Urine) measured?

Creatinine correction improves comparability of spot urine metal levels. Very low creatinine suggests over-hydration or collection error; very high creatinine suggests dehydration or incomplete mixing. Some laboratories flag samples outside 20–300 mg/dL as unsuitable for creatinine-corrected reporting.

Reference ranges

Standard reference: 20–300 mg/dL (varies with muscle mass, hydration, and sex)
Functional medicine optimal: Within the reportable range (20–300 mg/dL) for valid correction.
Units: mg/dL, mmol/L

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

Tests that measure Creatinine (Urine)

1 test on BiomarkersLabs.com include this biomarker.

BML-HMT-016Comprehensive

EnviroTOX Complete + Metals

Creatinine (Urine) reference range in this test: 20–300 mg/dL (varies with muscle mass, hydration, and sex)

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Mercury (Urine)Hg2 tests Lead (Urine)Pb2 tests Cadmium (Urine)Cd2 tests Arsenic (Urine, Total and Speciated)As2 tests Aluminium (Urine)Al1 test Antimony (Urine)Sb1 test Barium (Urine)Ba1 test Caesium (Urine)Cs1 test

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