Heavy Metals Blood Test (Lead, Mercury, Arsenic, and Cadmium Panel)

What is this test? This test measures the amount of certain metals in your blood. Your doctor may order it if there is concern that you have been exposed to toxic metals through your job, your home environment, food, water, or certain medications.

This test examines the pattern of three substances in your urine: beta-alanine, beta-aminoisobutyrate (BAIB), and gamma-aminobutyrate (GABA, also known as GABA). These are all amino acid derivatives that your body produces during normal metabolism. The test doesn't just measure each substance separately—it looks at how they relate to each other, which helps doctors identify specific metabolic problems.

What are these substances? The substances measured are metals such as lead, mercury, arsenic, and cadmium. Very small amounts of some metals are normal, but when they build up in the body at higher levels, they can damage your nerves, kidneys, liver, and other organs.

Beta-alanine is an amino acid that helps build carnosine, a compound important for muscle function and buffering acid during exercise. Beta-aminoisobutyrate is produced when your body breaks down thymine, a component of DNA. GABA is the main calming neurotransmitter in your brain, helping to reduce nerve cell activity and promote relaxation.

Why is it done? This test is done to find out whether you have been exposed to harmful levels of metals, to help explain symptoms such as fatigue, numbness or tingling, stomach pain, or mood changes, and to monitor your progress if you are receiving treatment to remove metals from your body.

This test is primarily used to screen for and diagnose inherited metabolic disorders. Abnormal patterns of these compounds in urine can indicate problems with how your body processes certain amino acids or produces neurotransmitters. Doctors may order this test if you have symptoms such as developmental delays, muscle weakness, seizures, or unexplained neurological problems.

How is the sample collected? A health professional will clean a spot on your arm and draw a small amount of blood from a vein using a thin needle, then apply a bandage. In some cases, a urine sample may also be requested, depending on which type of exposure your doctor is checking for.

You will need to provide a urine sample. Generally, a first-morning sample is preferred as it is more concentrated. Your healthcare provider may give you specific instructions about diet or medication restrictions before collecting the sample. It's important to follow these instructions carefully for accurate results.