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Arsenic, Random Urine with Reflex to Fractionated
Ordering Recommendation
Preferred test for the assessment of acute or chronic arsenic exposure. This test is able to differentiate between toxic inorganic and methylated species as well as benign organic forms. Results are reported as total inorganic, total methylated, and organic arsenic.
New York DOH Approval Status
Specimen Required
Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, nonessential over-the-counter medications (upon the advice of their physician), and avoid shellfish and seafood for 48 to 72 hours. High concentrations of iodine may interfere with elemental testing. Collection of urine specimens from patients receiving iodinated or gadolinium-based contrast media should be avoided for a minimum of 72 hours post exposure. Collection from patients with impaired kidney function should be avoided for a minimum of 14 days post contrast media exposure.
Random urine.
Transfer an 8 mL aliquot from a well-mixed collection to ARUP Trace Element-Free Transport Tubes (ARUP supply #43116), available online through eSupply using ARUP Connect(TM) or contact ARUP Client Services at 800-522-2787. (Min: 2 mL)
Refrigerated. Also acceptable: Room temperature or frozen.
Acid-preserved urine. Specimens collected within 72 hours after administration of iodinated or gadolinium-based contrast media.
Ambient: 1 week; Refrigerated: 2 weeks; Frozen: 2 months
Methodology
Quantitative High Performance Liquid Chromatography (HPLC) / Quantitative Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
Performed
Sun-Sat
Reported
1-5 days
Reference Interval
| Test Number |
Components |
Reference Interval |
|---|---|---|
| Arsenic Urine - per volume | Less than or equal to 34.9 microg/L | |
| Arsenic, Urine - ratio to CRT | Less than or equal to 29.9 microg/g CRT |
Interpretive Data
The ACGIH Biological Exposure Index (BEI) for arsenic in urine is 35 ug/L measured at the end of the work week. The ACGIH BEI is based on the sum of inorganic and methylated species. For specimens with elevated total arsenic results, fractionation is automatically performed to determine the proportions of inorganic, methylated, and organic species.
Elevated results may be due to skin or collection-related contamination, including the use of collection containers that are not certified to be trace element-free. If an elevated result is suspected to be due to contamination, confirmation with a second specimen collected in a certified trace element-free container is recommended.
Methodology: Inductively Coupled Plasma - Mass Spectrometry (ICP-MS)
Laboratory Developed Test (LDT)
Note
If total arsenic concentration is found to be elevated based on reference intervals, then Arsenic, Fractionated, will be added to determine the proportion of organic, inorganic, and methylated forms. Additional charges apply.
Hotline History
Hotline History
CPT Codes
82175; if reflexed, add 82175
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0020207 | Creatinine, Urine - per volume | 35674-1 |
| 0025001 | Arsenic Urine - per volume | 30924-5 |
| 0025058 | Arsenic, Urine - ratio to CRT | 13463-5 |
Aliases
- Arsenic/Creatinine Ratio, Random, Urine
- As
- ASU
- Normalized Urine Arsenic
- Normalized Urine As
