Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

MERCURY, TIMED URINE

General Information

Lab Order Codes:

MERU

Synonyms:

Hg, Urine

CPT Codes:

83825 – Mercury, quantitative

Test Includes:

Urine mercury concentration reported in mcg/specimen.

Logistics

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

Specimen Type:

Urine

Container:

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

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:

None

Sample Rejection:

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

Interpretive

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.

Limitations:

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.

Methodology:

Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)

References:

Mayo Medical Laboratories (January 2011)

Updates:

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



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