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24-Hour Urine Lead Concentration (Mass)

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

This test measures the total amount of lead found in your urine over a full day. It helps assess long-term exposure to lead, which can be harmful to your body.

Quick summary

["A 24-hour urine lead test helps detect chronic lead exposure that daily blood tests might miss."]

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

Key facts at a glance

LOINC
34325-1
Short code
Lead 24h Ur-sCnc
Synonyms
Lead 24h Ur-sCnc
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 you have symptoms of lead poisoning (e.g., fatigue, abdominal pain, or neurological issues), work in an environment with lead exposure, or have conditions like kidney disease that increase lead absorption. It’s also used in monitoring children or adults with known lead exposure.

How the Test Works

You’ll collect all urine for a full 24-hour period in a special container. The sample is then sent to a lab for analysis to measure lead levels in your urine.

Sample Collection Process

To prepare, empty your bladder before starting. Collect every drop of urine for the next 24 hours, including first-morning urine. Store the sample in a cool, dark place until ready to return it. Follow your doctor’s instructions precisely to ensure accuracy.

What to Expect After the Test

Results take several days to process. Your doctor will review them with you and discuss next steps, such as further testing, treatment, or changes to your environment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lead Urine 24-Hour

Frequently asked questions

What does a high lead level mean?
High lead levels in urine may indicate chronic exposure to lead, which can damage organs like the kidneys and brain, especially in children. Your doctor will interpret results in the context of your symptoms, medical history, and other tests.
How often should I get this test?
Your doctor will determine how often you need this test based on your exposure risk, symptoms, and test results. Regular monitoring may be recommended if you work in a high-risk job or have conditions that increase lead sensitivity.
Can I drink alcohol before the test?
No, avoid alcohol before collecting your urine sample, as it may affect lead levels. Follow your doctor’s specific instructions for diet, medications, or other preparations.
  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