Blood lead level is a test that measures the amount of lead in the blood.
Blood lead levels
A blood sample is needed. Most of the time blood is 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.
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.
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.
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 of lead 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 value ranges may vary slightly among different laboratories. Talk to your health care provider about the meaning of your specific test results.
Adults who have been exposed to lead should have blood lead levels below 40 µg/dL or 1.93 µmol/L. Treatment may be recommended if:
Centers for Disease Control and Prevention. Lead: What Do Parents Need to Know to Protect Their Children? Atlanta, GA. www.cdc.gov/nceh/lead/acclpp/blood_lead_levels.htm. Accessed June 23, 2015.
Kao LW, Rusyniak DE. Chronic poisoning: trace metals and others. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 22.
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: Elsevier Saunders; 2011:chap 702.
Schnur J, John RM. Childhood lead poisoning and the new Centers for Disease Control and Prevention guidelines for lead exposure. J Am Assoc Nurse Pract. 2014;26(5):238-47. PMID: 24616453 www.ncbi.nlm.nih.gov/pubmed/24616453.