Inorganic Arsenic, Creatinine-Adjusted, Urine — Mass Fraction
Measures inorganic arsenic in urine relative to creatinine, which helps account for differences in urine concentration.
["This test evaluates urinary inorganic arsenic exposure while adjusting for how concentrated the urine sample is."]
Key facts at a glance
- LOINC
- 110412-4
- Short code
- Inorg Arsenic/Creat Msmt Ur
- Synonyms
- Inorg Arsenic/Creat Msmt Ur
- Category
- kidney
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What is this test?
This test measures inorganic arsenic in a urine sample and compares it with the amount of creatinine in the same sample. Creatinine adjustment helps account for variations in urine concentration.
Why might I need this test?
It may be used to evaluate exposure to arsenic from occupational sources, contaminated water, soil, or other environmental sources. A clinician may also request it when symptoms or other findings raise concern about toxic metal exposure.
How is the test performed?
A urine sample is collected and analyzed for inorganic arsenic and creatinine. The laboratory uses the creatinine measurement to adjust or interpret the arsenic result relative to the concentration of the urine.
How do I prepare for the test?
Follow the collection instructions provided by your healthcare professional or laboratory, including whether a first-morning, spot, or timed specimen is required. Tell the laboratory about recent seafood consumption, supplements, occupational exposure, or any arsenic-containing products, because these may affect interpretation.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A higher creatinine-adjusted result may indicate increased exposure to inorganic arsenic, but interpretation depends on the collection method, recent diet, workplace or environmental exposure, and other laboratory findings. Some forms of seafood can increase total urinary arsenic without substantially increasing inorganic arsenic, so results may need to be interpreted cautiously. A lower result can occur when the urine is very dilute.
Short name
Creatinine-adjusted urinary inorganic arsenic
Frequently asked questions
Does a high result always mean arsenic poisoning?
Why is creatinine included in this test?
Should I avoid eating seafood before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy