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Lead in Nail Mass Concentration (24-hour)

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

This test measures the amount of lead present in your fingernails over a 24-hour period. Lead exposure can occur from environmental sources like dust, paint, or contaminated food/water.

Quick summary

["Nail lead testing helps assess long-term exposure to lead, which may not show up in blood tests alone."]

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

Key facts at a glance

LOINC
8202-4
Short code
Lead Nail-mCnt
Synonyms
Lead Nail-mCnt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you’ve had repeated exposure to lead (e.g., occupational hazards, living in an older home with lead paint) or if blood lead levels are elevated but unclear. It helps track chronic exposure that blood tests might miss.

How Is the Test Performed?

A small sample of your fingernails is collected (usually from the fingertips). The nails are cleaned to remove surface contaminants before analysis. The lead content is measured using a specialized laboratory technique.

What Do the Results Mean?

Results are reported as mass concentration (micrograms of lead per gram of nail). Higher levels may indicate ongoing exposure to lead, which can affect your health over time. Your provider will interpret results in the context of your medical history and other tests.

What Are the Risks?

There are no risks associated with nail lead testing. The procedure is quick and painless, and only a small amount of nail is needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lead in nails (24-hour)

Frequently asked questions

Why might my healthcare provider recommend this test?
They may suggest it if you’ve had occupational exposure to lead, live in an older home with peeling paint, or if your blood lead levels are elevated but unclear. It helps assess long-term exposure that can’t always be detected in blood tests.
How long does it take to get results?
Results are typically available within 1–2 weeks after the sample is sent to the laboratory.
Can I do anything to prepare for this test?
No special preparation is needed. Avoid trimming or filing your nails before the test, as this could alter the sample.
  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