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Lab Dept:
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Chemistry
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Test Name:
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MERCURY, TIMED URINE
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General Information
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Lab Order Codes:
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MERU
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Synonyms:
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Hg, Urine
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CPT Codes:
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83825 – Mercury, quantitative
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Test Includes:
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Urine mercury concentration reported in mcg/specimen.
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Logistics
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Test Indications:
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Useful for detecting mercury toxicity.
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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Mayo Medical Laboratories (MML Test# 8592)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 - 3 days, test set up Monday - Saturday
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Special Instructions:
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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.
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Specimen
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Specimen Type:
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Urine
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Container:
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24 hour urine container, See Collection
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Draw Volume:
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24 hour urine. Submit entire collection to the laboratory.
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Processed Volume:
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10 mL (Minimum: 2 mL) urine from a 24 hour urine collection
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Collection:
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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.
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Special Processing:
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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.
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Patient Preparation:
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None
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Sample Rejection:
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Improper use of preservatives; improper specimen handling; mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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0 – 15 years:
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Not established
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> or = 16 years:
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0 - 9 mcg/specimen
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24 hour specimens only
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Critical Values:
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>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.
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Limitations:
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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.
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Methodology:
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Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)
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References:
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Mayo Medical Laboratories (January 2011)
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Updates:
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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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