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Heavy Metal Blood Test
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Heavy Metal Blood Test

Heavy metal blood tests measure levels of potentially toxic metals in your system to diagnose poisoning or monitor workplace exposure.

What is a heavy metal blood test?

A heavy metal blood test is a group of tests that measures the levels of harmful metals in your blood. While it is normal to have trace amounts of some metals in your body, high levels can lead to heavy metal poisoning, which may cause organ damage, behavioral changes, and cognitive difficulties.

Commonly tested metals include lead, mercury, arsenic, cadmium, and chromium. Testing may also be performed on urine, fingernails, or hair.

Why do I need a heavy metal blood test?

Your provider may order this test if you have been exposed to heavy metals or exhibit symptoms of poisoning, such as:

  • Nausea, vomiting, or abdominal pain
  • Diarrhea
  • Tingling in the hands and feet
  • Shortness of breath
  • Chills
  • Muscle weakness
  • Memory loss or behavioral changes
  • Arrhythmia

Children under age 6 are often tested for lead if they live in homes built before 1978, as lead-based paint and household dust pose significant risks to developing brains.

What happens during the test?

A health care professional will collect a small blood sample from a vein in your arm using a small needle. The process typically takes less than five minutes.

Preparation

You should avoid eating seafood for 48 hours before your test, as some fish and shellfish contain high levels of mercury.

What do the results mean?

  • Higher than normal levels: May indicate heavy metal poisoning. Your provider may recommend chelation therapy, which uses medication to help your body remove the metals.
  • Normal or low levels: Usually indicate no poisoning. However, because some metals leave the bloodstream quickly to be stored in tissues, your provider may order additional tests (urine, hair, or fingernail) if symptoms persist.

Frequently Asked Questions

Blood levels of most metals (lead, mercury, cadmium, arsenic) peak within hours to a few days after acute exposure, so testing as soon as possible—ideally within 24‑48 hours—captures the highest concentration. For chronic low‑level exposure, routine screening can be done at any time, but your clinician may ask about recent work or environmental changes to interpret the values correctly.
The primary treatment is chelation therapy, using agents such as dimercaprol, calcium disodium EDTA, or DMSA, which bind lead and facilitate urinary excretion. Chelation is reserved for blood lead concentrations above the CDC’s action threshold (≥5 µg/dL in children, ≥10 µg/dL in adults) and after confirming no contraindications. Risks include kidney dysfunction, electrolyte imbalances, and gastrointestinal upset, so therapy is closely monitored with repeat blood tests and kidney function panels. Lifestyle changes—removing the source of exposure, improving nutrition (iron, calcium, vitamin C) and ensuring a clean home environment—are also essential components of management.
Both methods are acceptable, but venous blood is the gold standard because it provides a larger sample volume and more precise quantification. For children under 6, many pediatric clinics use a heel‑stick or finger‑prick with specialized micro‑tubes, which are validated for lead and mercury. Discuss with your pediatrician which method is best for your child’s age and comfort.
Yes. Methylmercury from fish and shellfish can temporarily raise blood mercury levels. To avoid a misleading result, most labs request that you avoid all fish, shellfish, and seafood for at least 48 hours before the draw. If you cannot abstain, inform the lab so they can note the potential dietary contribution.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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