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Lead levels - blood


Definition:

Blood lead level is a test that measures the amount of lead in the blood.

Alternative Names:

Blood lead levels

How the test is performed:

A blood sample is needed. Most of the time blood is typically drawn from a vein located on the inside of the elbow or the back of the hand.

In infants or young children, a sharp tool called a lancet may be used to puncture the skin.

  • The blood collects in a small glass tube called a pipette, or onto a slide or test strip.
  • A bandage is put over the spot to stop any bleeding.
How to prepare for the test:

No special preparation is needed.

For children, it may be helpful to explain how the test will feel and why it is done. This may make the child feel less nervous.

How the test will feel:

You may feel slight pain or a sting when the needle is inserted. You may also feel some throbbing at the site after the blood is drawn.

Why the test is performed:

This test is used to screen people at risk for lead poisoning. This may include industrial workers and children who live in urban areas. The test is also used to measure how well treatment for lead poisoning is working.

Lead is common in the environment so it is often found in the body in low levels. Small amounts in adults are not thought to be harmful. However, even low levels of lead can be dangerous to infants and children. It can cause lead poisoning that leads to problems in mental development.

Normal Values:

Adults:

  • Less than 20 micrograms/dL of lead in the blood

Children:

  • Less than 10 micrograms/dL of lead in the blood

Note: dL = deciliter

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.

What abnormal results mean:

Adults who have been exposed to lead should have blood lead levels below 40 micrograms/dL. Treatment is recommended if:

  • You have symptoms of lead poisoning
  • Your blood lead level is greater than 60 micrograms/dL.

In children:

  • Blood lead level of 10 micrograms/dL or greater requires further testing and monitoring.
  • The source of lead must be found and removed.
  • A lead level greater than 45 micrograms/dL in a child's blood usually indicates the need for treatment.
  • Treatment may be considered with a level as low as 20 micrograms/dL.
References:

Markowitz M. Lead poisoning. In: Kliegman RM, Stanton BF, St. Geme JW, Schor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa.: Saunders Elsevier; 2011:chap 702.

McGuigan MA. Chronic poisoning: trace metals and others. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa.: Saunders Elsevier; 2011:chap 21.


Review Date: 4/24/2013
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2002 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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