Skip to content

24-Hour Urinary Copper Excretion Rate

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

This test measures how much copper your body excretes in urine over a full day. Copper is a mineral that plays a role in many bodily functions, including energy production and immune support.

Quick summary

["Assesses copper loss through urine, which can help identify copper-related health concerns."]

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

Key facts at a glance

LOINC
14666-2
Short code
Copper 24h Ur-sRate
Synonyms
Copper 24h Ur-sRate
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 This Test Is Done

Your doctor may order this test if they suspect a condition affecting copper metabolism, such as Wilson’s disease (a genetic disorder causing copper buildup) or other copper-related disorders. It can also be part of monitoring for kidney function or certain genetic conditions that alter copper excretion.

What to Expect Before the Test

You’ll collect all your urine for a full 24-hour period, typically starting and ending with your first morning urine. Store the urine in a refrigerator or cool container, and bring the entire sample to the lab. Follow your doctor’s instructions carefully to ensure accurate results.

How the Test Works

The test measures the amount of copper in your urine over 24 hours. Your sample is analyzed in a lab to determine the total copper excreted, which helps assess how well your body is processing this mineral.

Possible Results and Interpretation

Results are compared to standard ranges for healthy individuals. Low levels may indicate conditions like Wilson’s disease or malabsorption issues, while very high levels could suggest kidney problems or other metabolic disorders. Your doctor will discuss findings with you based on your medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-hour urine copper

Frequently asked questions

What causes abnormal copper excretion?
Conditions like Wilson’s disease (which causes copper to build up in the body), kidney disease, or certain genetic disorders that disrupt copper metabolism may lead to abnormal results. Dietary factors, such as excessive copper intake, can also influence these levels.
How long will I need to collect urine for this test?
You’ll typically collect urine for a full 24-hour period, starting and ending with your first morning urine. This ensures an accurate measurement of daily copper excretion.
Can I take medications or supplements before this test?
Some medications or supplements containing copper or other minerals may affect results. Always check with your doctor or lab technician before the test to avoid interference.
  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