Arsenic, Random Urine with Reflex to Fractionated
Also known as: U ARS RAND
Use
This test is used for the assessment of acute or chronic arsenic exposure, differentiating between toxic inorganic and methylated species as well as benign organic forms. It is particularly useful for monitoring occupational exposure or evaluating potential poisoning in patients. For specimens with elevated total arsenic results, fractionation is automatically performed to determine the proportions of inorganic, methylated, and organic species.
Special Instructions
Patients should avoid nutritional supplements, vitamins, minerals, nonessential medications, and seafood for 48 to 72 hours prior to specimen collection. High iodine concentrations may interfere with testing. Avoid urine collection 72 hours after iodinated/gadolinium-based contrast exposure, and 14 days for patients with impaired kidney function after such media exposure.
Limitations
The test may yield falsely elevated results due to skin or collection-related contamination. Elevated arsenic results due to contamination should be confirmed with a second specimen collected in a certified trace element-free container. Certain medications, supplements, or dietary habits may also affect the test results.
New York Approved
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 30924-5
- 35674-1
- 13463-5
Result Turnaround Time
1-5 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
8 mL
Minimum Volume
2 mL
Container
ARUP Trace Element-Free Transport Tubes
Collection Instructions
Transfer an aliquot from a well-mixed collection to the transport tube.
Patient Preparation
Avoid nutritional supplements, seafood, and contrast media exposure prior to collection as specified.
Storage Instructions
Refrigerated. Also acceptable: Room temperature or frozen.
Causes for Rejection
Acid-preserved urine or specimens collected within 72 hours after administration of contrast media.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 week |
| Refrigerated | 2 weeks |
| Frozen | 2 months |
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