Lab Dept:


Test Name:

Mercury, Timed Urine

General Information

Lab Order Codes:



Hg, Urine

CPT Codes:

83825 – Mercury, quantitative

Test Includes:

Urine mercury concentration reported in mcg/specimen.


Test Indications:

Useful for detecting mercury toxicity.

Lab Testing Sections:

Chemistry - Sendouts

Referred to:

Mayo Medical Laboratories (MML Test: 8592/HGU)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 - 3 days, test set up Monday - Saturday

Special Instructions:

Submit an entire 24-hour urine collection. No preservative. Refrigerate specimen during and after collection.

Note: Starting and ending times of collection are required for a timed urine collection and must be documented electronically or on the proper request form.


Specimen Type:



24 hour urine container, See Collection

Draw Volume:

24 hour urine. Submit entire collection to the laboratory.

Processed Volume:

10 mL (Minimum: 2 mL) urine from a 24 hour urine collection


Collect in clean, plastic urine container(s) with no metal cap(s) or glued insert. Specimen should be refrigerated or collected on ice to preserve specimen.


Special Processing:

Lab Staff: Mix 24 hour specimen well. Measure entire specimen. Remove aliquot into a 13 mL urine tube or a clean, plastic aliquot container with no metal cap or glued insert. Refrigerate specimen within 4 hours of completion of 24 hour collection. Store and ship at refrigerated temperatures. 24 hour volume is required on request form for processing. Forward promptly.

Patient Preparation:


Sample Rejection:

Improper use of preservatives; improper specimen handling; mislabeled or unlabeled specimens


Reference Range:

0 – 15 years:

Not established

> or = 16 years:

0 - 9 mcg/specimen

24 hour specimens only

Critical Values:

>50 mcg/specimen

Note: The concentration at which toxicity is expressed is widely variable between patients. 50 mcg/24 hours is the lowest concentration at which toxicity is usually apparent.


To avoid contamination by dust, specimen should be collected away from the site of expected exposure.

Gadolinium is known to interfere with most metals tests. If gadolinium-containing contrast media has been administered, a specimen should not be collected for 96 hours.


Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)


Mayo Medical Laboratories (January 2011)


7/13/2010: Units changed from ug/specimen (ug/L) to mcg/specimen (mcg/L).
1/5/2011: Updated reference range.