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Lab test

Mercury, RBCs Test

This test measures the amount of mercury present in red blood cells. Quest describes it as intended for exposure monitoring or investigation of mercury, rather than for clinical diagnostic use.

Quest patient service center

About this test

The test measures mercury concentration in red blood cells (RBCs) using inductively coupled plasma/mass spectrometry (ICP/MS), a method that quantifies trace metals directly from the sample. Quest describes the result as intended for exposure monitoring or investigation, rather than for diagnosing a medical condition.

The sample is 1 mL of red blood cells, collected in an EDTA trace metal-free tube, sometimes described as a royal blue-top tube. That specialized collection tube is used to avoid metal contamination that could otherwise affect a trace-metal result like this one.

Who might consider this test?

  • Usually looking into a possible mercury exposure
  • Want a quantitative measurement to track or investigate alongside that history

Test details

CollectionQuest patient service center

Quest resources

Additional details

What this test looks at

The test reports one value: the concentration of mercury measured specifically in red blood cells, using the ICP/MS method described above. Quest frames this measurement for exposure monitoring or investigation, not as a diagnostic result to be read on its own.

This test isn't part of the Celio Health store at the moment, so it can't be ordered or requested here. The test menu lists everything that can.

Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.

Frequently asked questions

What does this test measure?

It measures the concentration of mercury in red blood cells (RBCs), using inductively coupled plasma/mass spectrometry (ICP/MS).

How is the sample collected?

Through a blood draw that collects 1 mL of red blood cells into an EDTA trace metal-free tube, sometimes called a royal blue-top tube.

Do I need to prepare for this test?

No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.

Is this test used to diagnose mercury poisoning?

No. Quest describes this test as intended for exposure monitoring or investigation, not for clinical diagnostic use. A clinician interprets the result together with the reason it was ordered.

Last updated 2026-09-18 · How we write about lab testing

Educational content

This page is for general educational purposes only. It is not medical advice, and it is not a substitute for consultation with a qualified healthcare professional. Laboratory results should always be interpreted by a licensed clinician who knows your health history. If you have questions about your health or your results, talk with your doctor. If you think you may be experiencing a medical emergency, call 911.