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Arsenic, 24-Hour Urine

Test Codes

EPIC: LAB1231491, Beaker: XARU24, MAYO: ASU24

Department

Send Outs

Instructions

• Please refer to the Specimen Collection Manual for instructions on 24-Hour Urine Collection:

• Urine 24-Hour Collection - Inpatient
• Urine 24-Hour Collection - Outpatient
• Urine 24-Hour Collection - Outreach

• Patient should not eat seafood for a 48-hour period prior to start of collection.

• 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 Collection Criteria

Collect (preferred specimen): 24-hour urine sample with no preservative.
Keep 24-hour urine specimen iced or refrigerated during collection.

• Include start and end dates and times for the collection period on the specimen container.

Urine Preservative Options
No Preservative	6N Hydrochloric Acid	Boric Acid (10g)	Sodium Carbonate	50% Acetic Acid
Preferred	Acceptable	Unacceptable	Unacceptable	Acceptable

Physician Office/Draw Specimen Preparation

Maintain specimens refrigerated (2-8°C or 36-46°F) prior to transport.

Preparation for Courier Transport

Transport: Entire 24-hour urine collection, refrigerated (2-8°C or 36-46°F).

Rejection Criteria

Specimens not collected and processed as indicated.

In-Lab Processing

Measure total volume of 24-hour urine specimen. Record total volume and collection start and end dates and times in the LIS system. Aliquot 8.0 mL from the well-mixed 24-hour urine collection into a metal-free transport tube. (Minimum: 3.0 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 72 hours
Refrigerated (2-8°C or 36-46°F): 28 days
Frozen (-20°C/-4°F or below): 28 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Mayo Clinic Laboratories in Rochester, MN.

Performed

Monday – Saturday
Results available in 2-5 days.

Reference Range

By report.

Test Methodology

Quantitative Inductively Coupled Plasma / Mass Spectrometry.

CPT Codes

82175

Contacts

Last Updated

10/16/2024