Does this test have other names?
What is this test?
This test measures the amount of mercury in your urine.
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. You can also be exposed
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 in silver amalgam dental fillings. Tiny amounts of mercury may be
absorbed from these fillings, but this amount is not likely to cause health problems.
Why do I need this test?
You may have this test if your healthcare provider suspects that you have mercury
poisoning. Symptoms include:
Shortness of breath
Inhaling mercury can cause:
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 might also have this test if you are having chelation therapy for mercury poisoning.
Chelation is a treatment that flushes out and removes toxins from your body. This
test finds out whether the treatment is working.
What other tests might I have along with this test?
Your healthcare provider might also order a test to measure mercury levels in your
blood. He or she may also test hair from your scalp to measure mercury exposure.
What do my test results mean?
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 healthcare
Results are given in nanograms per milliliter (ng/mL). Urine levels of mercury less
than 20 ng/mL are considered safe.
Having some mercury in your urine doesn't mean you will develop health problems.
High levels of mercury in your urine could mean that you have mercury poisoning and
How is this test done?
The test requires a urine sample. Your healthcare provider will tell you how to collect
a sample in a sterile container.
This test may use a 24-hour urine sample. For this sample, you must collect all the
urine you produce for 24 hours. Empty your bladder completely first thing in the morning
without collecting it and note the time. Then collect your urine every time you go
to the bathroom for the next 24 hours.
Does this test pose any risks?
This test poses no known risks.
What might affect my test results?
Certain medicines and skin-lightening creams that contain mercury can cause your mercury
levels to rise. Eating fish and shellfish that contain high levels of mercury can
raise your mercury levels.
How do I get ready for this test?
You don't need to prepare for this test.