Inorganic Arsenic and Creatinine, 24-Hour Urine
Measures inorganic arsenic collected in urine over 24 hours, with urine creatinine used to help assess the collection and interpret the result.
["An elevated result may indicate exposure to inorganic arsenic, a toxic element found in contaminated water, foods, or certain workplaces."]
Key facts at a glance
- LOINC
- 44300-2
- Short code
- Inorg Arsenic/Creat 24h Ur
- Synonyms
- Inorg Arsenic/Creat 24h 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 urine collected for 24 hours. Urinary creatinine is also measured to help evaluate urine concentration and whether the collection appears adequate.
Why might I need this test?
It may be ordered to investigate suspected arsenic exposure, especially after contact with contaminated water, soil, industrial materials, or certain occupational chemicals. It can also be used to follow arsenic levels during treatment or exposure investigation.
How is the test performed?
You collect all urine for a full 24-hour period in the container provided by the laboratory. The urine is then analyzed for inorganic arsenic, and the result may be interpreted along with the amount of creatinine in the collection.
How do I prepare for the test?
Follow the laboratory's collection instructions carefully and note the date and time you begin. Ask whether you should avoid seafood, which can increase urinary arsenic, and do not stop medicines or supplements unless your clinician instructs you to do so.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An elevated urinary inorganic arsenic result may indicate recent exposure to inorganic arsenic from sources such as contaminated drinking water, industrial work, pesticides, or contaminated foods. Creatinine helps the laboratory account for differences in urine concentration and assess the adequacy of the 24-hour collection. Results should be interpreted by a clinician because recent exposure, diet, medications, and laboratory methods can affect them.
Short name
24-Hour Urine Inorganic Arsenic
Frequently asked questions
Does eating seafood cause a high result?
Why is creatinine included in this test?
What should I do if my arsenic level is high?
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