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Laboratory: Clinical Biochemistry  (SENDOUTS)
Test Name:
Test Code: HGU
Clinical Information:
Avoid seafood consumption for three days prior to collection.
Test Indications: Detecting mercury toxicity, even though the correlation between the levels of mercury excretion in the urine and the clinical symptoms is considered poor.
24-hour urine mercury measurement is the preferred test to assess toxicity in patients who have suspected stable and chronic exposure to elemental mercury. While whole-blood mercury concentrations can reflect very large acute mercury exposure, this test becomes less reliable as redistribution to tissues takes place, making 24-hour urine testing more reliable in stable, chronic, or low-grade mercury exposures.
Treatment with a chelating agent is indicated in selected patients. Chelators increase the urinary excretion of mercury.

Test Approval Requirements: F260-11-02 Biochemistry Approval for Test Referral Form

Collection Devices:
Specimen Required:
Urine: 10.0 mL

Specimen Stability:
Ambient: 14 days
Refrigerated: 11 months
Frozen: 11 months
Urine: 10.0 mL

Shipping & Storage: Collect and transfer 10 mL in a metal-free specimen vial. State ’24 h urine’, ’collection date’ and ’total volume’ or indicate ’Random’. Store and send refrigerated to In-Common Laboratories.
Referred Out Location: In-Common Laboratories
Reference Values:
Within 2 Weeks
See Also:
More Information: