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Test ID HGRU Mercury, Random, Urine

Reporting Name

Mercury, Random, U

Useful For

Detecting mercury toxicity

Specimen Type


Specimen Required

Collection Container/Tube: Clean, plastic urine collection container

Submission Container/Tube: Plastic, 5-mL tube (T465) or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 2 mL

Collection Instructions:

1. Collect a random urine specimen.

2. See Trace Metals Analysis Specimen Collection and Transport in Special Instructions for complete instructions.

Additional Information: High concentrations of gadolinium and iodine are known to interfere with most metals tests. If either gadolinium- or iodine-containing contrast media has been administered, a specimen should not be collected for 96 hours.

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 7 days
  Frozen  7 days

Reference Values

0-15 years: not established

≥16 years: 0-9 mcg/L

Day(s) and Time(s) Performed

Monday through Friday; 7 p.m., Saturday; 2 p.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
HGRU Mercury, Random, U 5689-5


Result ID Test Result Name Result LOINC Value
60248 Mercury, Random, U 5689-5

Clinical Information

The correlation between the levels of excretion in the urine and the clinical symptoms is considered poor, but urinary mercury (Hg) is the most reliable way to assess exposure to inorganic mercury.


For additional information, see HG / Mercury, Blood.


Daily urine excretion >50 mcg/day indicates significant exposure (per World Health Organization standard).

Clinical Reference

1. Lee R, Middelton D, Caldwell K, et Al: A Review of Events That Expose Children to Elemental Mercury in the United States. Environ Health Perspect 2009;117:871-878

2. Bjorkman L, Lundekvam BF, Laegreid T, et al: Mercury in human brain, blood, muscle and toenails in relation to exposure: an autopsy study. Environmental Health 2007;6:1186-1476

Analytic Time

1 day

Method Name

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)