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Total Anesthesia-Related Toxic Substance Exposure Screening (Serum/Plasma)

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

This test checks for potential exposure to harmful substances during anesthesia, including medications or contaminants that may affect your body.

Quick summary

["Assessing exposure helps ensure your safety during anesthesia procedures."]

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

Key facts at a glance

LOINC
25046-4
Short code
CT W anesthesia
Synonyms
CT W anesthesia
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

This screening evaluates the presence of specific toxicants or anesthetic-related compounds in your blood. It may include monitoring for substances like volatile anesthetics, local anesthetics, or other xenobiotics (foreign substances) that could impact your health.

Why It’s Done

Your healthcare provider may order this test if you’re undergoing anesthesia, especially if you have a history of sensitivity to anesthetics, exposure risks, or if monitoring for potential adverse effects is needed.

Common Uses in Clinical Settings

This screening is often used preoperatively to assess baseline levels of anesthetic agents or contaminants before surgery. It may also be part of a broader toxicology panel if you’ve had recent exposure to potentially harmful substances.

What to Expect Before the Test

No special preparation is typically required. A blood sample will be drawn from a vein in your arm. If you’re undergoing anesthesia, your provider may coordinate the timing with your procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

If elevated levels are found, it may indicate recent exposure to anesthetic agents or other toxins. This can help guide treatment decisions, such as adjusting medications or monitoring for side effects.
Elevated levels may suggest recent anesthetic exposure, which could require closer observation or additional interventions to manage risks.
What does a positive result mean?
A positive result means your blood contains higher-than-normal levels of certain anesthetic-related substances or toxins. This could mean you’ve been exposed recently or may need additional monitoring.
How often will I need this test?
The frequency depends on your medical history, procedure, and healthcare provider’s recommendations. Some patients may need it only once, while others may require follow-up testing.
  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