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Lead [Mass Concentration] in Blood

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

This test measures the amount of lead in a blood sample to check for exposure to this harmful heavy metal. It is used to screen people at risk and to monitor those known to have been exposed.

Quick summary

["A blood lead test shows how much lead is currently in your bloodstream and helps guide follow-up and prevention."]

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

Key facts at a glance

LOINC
79266-3
Short code
Lead Dentin-mCnt
Synonyms
Lead Dentin-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

What the Test Measures

The test measures the mass concentration of lead in whole blood, which reflects recent exposure to lead. Lead is a metal that can enter the body through breathing contaminated air or dust, drinking contaminated water, or eating contaminated food.

Why It Is Ordered

Your clinician may order this test if you have symptoms of lead exposure, work in a job that involves lead, live in an older home with lead paint or pipes, or have another risk factor. It may also be used to monitor people already known to have elevated levels.

How the Sample Is Collected

A small sample of blood is drawn, usually from a vein in your arm. In some cases a finger-stick sample may be used for screening. Be sure to tell the collector about any lead exposure risks so results can be interpreted correctly.

What Results Mean

Results are compared with age-specific reference levels set by health authorities. Because no safe blood lead level has been identified, even low levels may prompt steps to reduce exposure. Your clinician will explain what your result means for you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Blood Lead Level

Frequently asked questions

Does a blood lead test show past exposure?
A blood lead test mainly reflects recent exposure, but lead can stay in the blood for weeks to months. Very old or chronic exposure may be better assessed with other tests chosen by your clinician.
Do I need to fast before this test?
Fasting is generally not required for a blood lead test, but follow any specific instructions from your clinician or the laboratory.
Can I lower my blood lead level?
The main step is to find and remove the source of exposure. Your clinician may recommend dietary and hygiene measures and, in some cases, medical treatment. Never attempt chelation or other treatments without medical supervision.
  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