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Succinylcholine concentration (serum/plasma)

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

This test measures the level of succinylcholine, a medication used during certain types of surgery to help relax muscles.

Quick summary

["Succinylcholine levels help monitor how your body processes this drug before or after surgery."]

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

Key facts at a glance

LOINC
17661-0
Short code
Succinylcholine SerPl-mCnc
Synonyms
Succinylcholine SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is This Test Measuring?

Succinylcholine is a fast-acting muscle relaxant often used in anesthesia to prevent involuntary muscle movements during surgery. This test checks how much of the drug remains in your bloodstream, which can affect how long its effects last and whether it’s safe to use in your case.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you’re receiving succinylcholine during surgery or if there’s concern about how your body processes it, such as in cases of muscle disorders or genetic variations that could alter drug metabolism.

How Is the Sample Collected?

A blood sample is drawn from a vein in your arm. The sample is collected in a tube that separates serum or plasma from blood cells for testing.

What Does the Result Mean?

Results are typically interpreted in the context of your medical condition, the dose of succinylcholine administered, and how long since the medication was given. Abnormal levels may indicate how quickly your body breaks down the drug or if it’s not working as expected.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

None

Frequently asked questions

What are the normal reference ranges for this test?
Reference ranges for succinylcholine concentration can vary by lab and clinical context. They are not standardized alone but are instead interpreted based on the timing relative to drug administration and patient-specific factors like metabolism.
How long does it take to get results from this test?
Results are usually available within 24 hours, depending on lab processing times. Your healthcare provider will discuss the findings with you during or after your surgery.
Can I eat or drink before this test?
No fasting is typically required for this test, as it involves a blood draw. However, always follow your provider’s specific instructions for your procedure.
  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