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: Chloromethane, Whole Blood, Mass Concentration

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

: This test measures the amount of chloromethane (also called methyl chloride) in a whole blood sample. It is used to assess exposure to this volatile industrial chemical.

Quick summary

[": A chloromethane blood test estimates recent exposure to this chemical by measuring its mass concentration in whole blood."]

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

Key facts at a glance

LOINC
9507-5
Short code
Chloromethane Bld-mCnc
Synonyms
Chloromethane Bld-mCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

: What Is Chloromethane?

: Chloromethane, also known as methyl chloride, is a colorless, sweet-smelling gas used in industry and also produced naturally in small amounts. People can be exposed by breathing it in workplaces or from certain consumer products.

: Why the Test Is Ordered

: A healthcare provider may order this test when there is concern about exposure to methyl chloride, such as after an occupational incident or a spill. It helps estimate how much of the chemical is present in the body.

: How the Test Is Performed

: A blood sample is drawn from a vein, usually in the arm, and collected in a tube designated for whole blood. Because chloromethane is volatile, timing and proper sample handling matter for accurate results.

: What the Results Mean

: Results report the mass concentration of chloromethane in whole blood. Interpretation depends on the testing laboratory and the circumstances of exposure, so results should always be discussed with your provider rather than compared to arbitrary cutoffs.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

: Chloromethane exposure can cause headache, dizziness, nausea, and in higher exposures, effects on the nervous system and liver. Blood measurement helps document exposure but must be interpreted alongside symptoms, exposure history, and timing, since the chemical clears from the body relatively quickly.

Short name

: Methyl chloride blood level

Frequently asked questions

: Is this test part of routine blood work?
: No. It is a specialized test ordered only when exposure to chloromethane is suspected; it is not included in standard blood panels.
: How soon after exposure should the test be done?
: Because chloromethane leaves the body fairly quickly, testing is most useful when done soon after exposure. Your provider will advise on the best timing for your situation.
: Can I get this test without a doctor's order?
: This is typically a provider-ordered test performed in a clinical or occupational health setting. Discuss any concerns about exposure with a healthcare professional.
  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