Arsenic, Blood Test
An arsenic, blood test measures the amount of arsenic present in a blood sample. Arsenic is an element found in some environments and foods, and clinicians use this marker to help evaluate the possibility of recent exposure.
About this test
Arsenic occurs naturally in soil, water, and certain foods, and it is also used in some industrial and agricultural settings. Because arsenic is not a nutrient the body needs, measuring it in the blood gives a clinician a way to think about whether recent contact with a source may have occurred. The result is always read as one piece of a larger picture rather than an answer on its own.
The test uses a routine blood draw at a Quest patient service center. A phlebotomist collects a sample from a vein, usually in the arm, and the sample travels to the laboratory. No special preparation is typically required, though people follow any instructions their ordering clinician provides. It is worth knowing that ordinary diet, especially some seafood, can influence arsenic measurements, which is one reason a clinician interprets the marker with a person's recent meals and habits in mind.
A blood measurement tends to reflect fairly recent exposure, since arsenic does not stay in the blood indefinitely. That timing matters: a clinician thinks about when a possible contact happened relative to the draw, and may choose to look at the situation more than once rather than relying on a single sample.
Who commonly orders it
People who look into an arsenic blood test are often exploring a possible source of exposure — for instance well water in certain regions, particular occupations or hobbies, or a household concern that has prompted a wider look. Some raise the topic after reading about arsenic in food or water and want to talk it through with a clinician.
Because everyday diet can affect the reading, this marker is most meaningful when a clinician knows the context around it. The same result can point in different directions depending on recent meals, water source, work, and overall health, so the conversation with a clinician is where it takes on meaning.
What this test looks at
The test looks at how much arsenic is circulating in the blood at the time the sample is drawn. Since arsenic is not something the body requires, its presence points toward contact with an outside source rather than a normal internal process. A clinician uses that alongside where a person lives, what they eat, and how they spend their time to weigh whether an exposure is likely.
It also helps to know the limits of a single sample. Blood reflects a recent window rather than a lifetime of exposure, and diet can nudge the reading, so a clinician reads the marker in context instead of treating it as a standalone verdict.
How it is often used
Clinicians commonly consider an arsenic blood test when a discussion about water, food, work, or hobbies raises a question about exposure. It may also be used to follow a situation over time — for example after a water source has been changed or a workplace practice adjusted — so a clinician can see how the marker shifts. In some occupational settings it is part of a broader monitoring routine overseen by an employer's clinician.
What to expect at your visit
No appointment is needed. People can walk into a Quest patient service center during open hours, and the draw itself is quick — a phlebotomist collects a small sample from a vein in the arm, and most visits wrap up in a few minutes. When the laboratory finishes its analysis, results are posted to the account, ready to review and share with a clinician who can place them in context.
Your results
Results will be emailed securely to you as a PDF.
One-time price · physician order included · no insurance needed
Prefer a fuller panel?
A curated bundle groups this test with the markers clinicians most often review alongside it — often better value than single tests.
Frequently asked questions
What does an arsenic blood test measure?+–
It measures the amount of arsenic present in a blood sample. Arsenic is not needed by the body, so the result helps a clinician evaluate whether recent contact with a source may have occurred.
Can food affect the result?+–
Yes. Some foods, particularly certain seafood, can influence arsenic measurements. A clinician takes recent meals into account when interpreting the marker, which is part of why context matters so much here.
How is the sample collected?+–
Through a routine blood draw at a Quest patient service center. A phlebotomist takes a small sample from a vein in the arm and sends it to the laboratory for analysis.
Does this test show long-term exposure?+–
A blood sample generally reflects fairly recent exposure rather than a lifetime total, because arsenic does not remain in the blood indefinitely. A clinician may consider timing and repeat testing when useful.
Do I need to prepare?+–
No special preparation is usually required, but people should follow any instructions their ordering clinician provides, since the reason for testing and individual circumstances can vary.
How much does the Arsenic test cost?+–
The cash price at Celio Health is $109. That covers the physician's order and the blood draw at a Quest patient service center — no insurance is needed and there's no separate doctor's visit to pay for.