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Mercury (total) in serum/plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of mercury present in your blood, which can help identify exposure to this heavy metal.

Quick summary

["Mercury levels in your blood may indicate potential exposure or health risks from this toxic substance."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
42499-4
Short code
D Dimer CSF Ql
Synonyms
D Dimer CSF Ql
Category
coagulation
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like nerve damage, kidney issues, or high levels of mercury in your environment (e.g., from certain industrial products, fish, or contaminated water). It can also be part of routine monitoring for people at higher risk, such as those exposed to mercury in their workplace or hobbies.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if instructed. Bring a list of medications to your appointment, as some may affect results.

How the Test Works

A blood sample is drawn from a vein in your arm. The sample is then analyzed in a lab using a sensitive detection method to measure mercury levels.

Possible Results and Next Steps

High levels of mercury may signal exposure that requires medical attention, such as reducing intake of mercury-containing foods or adjusting work environment practices. Low or normal levels do not necessarily mean no risk, especially if you have known exposure history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Mercury Level

Frequently asked questions

What Does a High Level Mean?
High mercury levels can damage your nervous system, kidneys, or cause other health problems, particularly in children or people with pre-existing conditions. Your doctor will discuss next steps based on your symptoms and exposure history.
What Does a Low Level Mean?
Low levels may mean you are not currently exposed to high amounts of mercury, but ongoing monitoring may still be recommended if you have a history of exposure.
How Often Should I Get This Test?
Your doctor will determine how often you need this test based on your risk factors, such as occupation, diet, or environmental exposure. Follow their guidance for regular check-ups.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy