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24-Hour Urinary Inorganic Arsenic Concentration

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of inorganic arsenic found in your urine over a 24-hour period. It helps assess exposure to arsenic, which can occur from contaminated water, food, or environmental sources.

Quick summary

["This test helps check if you’ve been exposed to arsenic over time."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
53838-9
Short code
Inorg Arsenic 24h Ur-mRate
Synonyms
Inorg Arsenic 24h Ur-mRate
Category
chemistry
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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms of arsenic poisoning (e.g., skin changes, nerve damage) or if you live in an area with known arsenic contamination in water or food. It’s also used in research or occupational health settings to monitor exposure in certain jobs or environments.

What Does the Test Involve?

You’ll collect all your urine over 24 hours in a special container. The test measures the total inorganic arsenic in that urine sample. The sample is sent to a lab for analysis.

What Are Common Results?

Results are typically reported as the total amount of inorganic arsenic excreted in milligrams or micrograms per day. Your results will be compared to reference ranges specific to the lab, but no standard ranges apply universally.

What Does It Mean If Results Are Abnormal?

High levels may indicate chronic exposure to arsenic, which can cause long-term health effects like organ damage or increased cancer risk. Low levels may suggest limited exposure or normal variation. Your provider will discuss findings with you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Chronic exposure to inorganic arsenic can lead to serious health issues, including kidney damage, skin lesions, and an increased risk of certain cancers. This test helps identify potential exposure before symptoms appear, allowing for early monitoring or intervention.

Short name

24h Urine Arsenic

Frequently asked questions

Why do I need a 24-hour urine test instead of a single sample?
A 24-hour urine test gives a more accurate picture of your average arsenic exposure over time. A single sample might miss fluctuations in your intake or metabolism, so collecting urine over a full day ensures a reliable measurement.
What should I do if I miss any urine during the test?
If you miss any urine, try to catch it as soon as possible. If you can’t complete the full 24 hours, your provider may adjust the test or ask for a shorter collection period. Always follow your lab instructions carefully.
Can I take medications or supplements that might affect this test?
Some medications or supplements (like certain diuretics or vitamins) may indirectly affect urine volume or composition. Let your provider know about all medications or supplements you’re taking before starting the test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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