This test measures the amount of mercury in your blood.
Mercury is a heavy metal that can be toxic. It occurs naturally as a liquid at room temperature and as an odorless vapor.
You can be exposed to mercury from polluted air or water, if you work in an industry that still uses mercury, from eating fish that are high in mercury, and from some complementary and alternative health remedies.
Long-term exposure to mercury can cause kidney and brain damage in adults. Exposure to mercury during pregnancy can cause permanent damage to the developing fetus. Breastfeeding may also expose infants to mercury.
Children who are exposed to mercury can suffer damage to their kidneys, nervous system, and digestive system.
Mercury is also present in silver amalgam dental fillings. Minute amounts of mercury may be absorbed from these fillings, but this amount is not likely to cause health problems.
You may have this test if your doctor suspects that you have mercury poisoning. Symptoms include:
Shortness of breath
Inhaling mercury can cause:
Burning sensation in your mouth
You may also need this test to monitor your safety if it's possible that you could be exposed to mercury at your work.
You may also have this test if you are pregnant or breastfeeding and have been exposed to high levels of mercury.
Your doctor may also order tests of your urine or breast milk to measure for mercury. He or she may also test hair from your scalp to measure mercury exposure.
Many things may affect your lab test results. These include the method each lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider.
The results of this test are given in nanograms per milliliter (ng/mL). Having some mercury in your blood does not necessarily mean you will develop health problems.
Here is the breakdown on higher results:
5 ng/mL: This may mean you are being exposed to unhealthy levels of mercury at your work or in your diet.
30 to 40 ng/mL: This level usually causes some symptoms and some brain or kidney damage.
Above 100 ng/mL: This is considered mercury poisoning.
The test requires a blood sample, which is drawn through a needle from a vein in your arm.
Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.
Certain Chinese herbal preparations or skin-lightening creams that contain mercury can cause your blood level to rise. Eating fish and shellfish that contain high levels of mercury can increase your mercury levels.
You don't need to prepare for this test.