Arsenic, 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.

Quantitative High Performance Liquid Chromatography/Quantitative Inductively Coupled Plasma-Mass Spectrometry
1-5 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
Specimen Required
Patient Preparation
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.  Abstinence from iodine-containing medications or contrast agents for at least 1 month prior to collecting specimens for elemental testing is recommended.  
24-hour or random urine collection. Specimen must be collected in a plastic container and refrigerated during collection. ARUP studies indicate that refrigeration of urine alone, during and after collection, preserves specimens adequately if tested within 14 days of collection.  
Specimen Preparation
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 or contact ARUP Client Services at (800) 522-2787. (Min: 2 mL)  
Storage/Transport Temperature
Refrigerated. Also acceptable: Room temperature or frozen.  
Unacceptable Conditions
Urine collected within 48 hours after administration of a gadolinium (Gd) containing contrast media (may occur with MRI studies). Acid preserved urine. Specimens contaminated with blood or fecal material. Specimens transported in non-trace element-free transport tube (with the exception of the original device).  
Trace Elements requisition form may be required (ARUP form #32990-Barcode; #32991-No Barcode).  
Ambient: 1 week; Refrigerated: 2 weeks; Frozen: 1 year  
Reference Interval
Effective May 18, 2015
Test Number
Reference Interval
 Arsenic Urine - per volume0-35.0 µg/L (based on Biological Exposure Index)
 Arsenic Urine - per 24h0-50.0 µg/d
 Arsenic, Urine - ratio to CRTLess than 30 ug/gCRT
0020734Arsenic, Fractionated, Urine
Test NumberComponents
Reference Interval
 Arsenic, OrganicRefer to report
 Arsenic, InorganicRefer to report
 Arsenic, MethylatedRefer to report

 Creatinine, Urine - per 24h
3-8 years140-700 mg/d140-700 mg/d
9-12 years300-1300 mg/d300-1300 mg/d
13-17 years500-2300 mg/d400-1600 mg/d
18-50 years1000-2500 mg/d700-1600 mg/d
51-80 years800-2100 mg/d500-1400 mg/d
81 years and older600-2000 mg/d400-1300 mg/d

Interpretive Data
The ACGIH Biological Exposure Index (BEI) for arsenic in urine is 35 µg/L. The ACGIH BEI is based on the sum of inorganic and methylated species. For specimens with a total arsenic concentration between 35-2000 µg/L, fractionation is automatically performed to determine the proportions of inorganic, methylated and organic species. It may be appropriate to request fractionation for specimens with a total arsenic greater than 30 µg/gCRT despite a total arsenic concentration less than 35 µg/L. If low-level chronic poisoning is suspected, the µg/gCRT ratio may be a more sensitive indicator of arsenic exposure than the total arsenic concentration.

Compliance Statement B: For laboratory developed tests not using a RUO kit, and for FDA approved, cleared or 510(k) exempt assays with alterations. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.
If total arsenic concentration is between 35-2000 ug/L, then Arsenic, Fractionated, will be added to determine the proportion of organic, inorganic, and methylated forms. Additional charges apply.
CPT Code(s)
82175; if reflexed, add 82175 
Component Test Code*Component Chart NameLOINC
0020207Creatinine, Urine - per volume2161-8
0020208Creatinine, Urine - per 24h2162-6
0025001Arsenic Urine - per volume21074-0
0025002Arsenic Urine - per 24h5587-1
0025058Arsenic, Urine - ratio to CRT13824-8
0097110Total Volume19153-6
0097111Hours Collected30211-7
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • Arsenic/Creatinine Ratio, Random, Urine
  • As
  • ASU
  • Normalized Urine As, Normalized Urine Arsenic