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Cocaine metabolite benzoylecgonine concentration (serum/plasma)

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

This test measures the presence of benzoylecgonine, a breakdown product of cocaine, in your blood. It helps assess recent cocaine use.

Quick summary

["This test helps doctors determine if you’ve used cocaine recently, aiding in treatment planning or legal evaluations."]

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

Key facts at a glance

LOINC
91029-9
Short code
Cocaine+BZE Mec Ql Scn
Synonyms
Cocaine+BZE Mec Ql Scn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
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

Why This Test Is Done

Your healthcare provider may order this test if you’ve been exposed to cocaine, suspected of using it, or are part of a substance use assessment. It can also be used in legal cases or to monitor treatment progress.

What to Expect Before the Test

No special preparation is needed. The blood sample is typically taken from a vein in your arm. If you’re nervous, let your provider know—they can help make it more comfortable.

What the Test Results Mean

Results show the amount of benzoylecgonine in your blood. Higher levels suggest recent cocaine use, but they don’t indicate how much was consumed or for how long. Results may vary based on factors like metabolism and timing since use.

How the Test Works

This test uses a specialized lab method to detect benzoylecgonine in your blood. It’s not the same as testing for cocaine directly—it measures its breakdown product instead.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Benzoylecgonine levels can provide evidence of recent cocaine exposure, useful for medical, legal, or treatment-related decisions. However, they don’t show past use alone—other factors like timing and metabolism play a role. False positives or negatives can occur, so results should be interpreted with clinical context.

Short name

Benzoylecgonine (BZE) Level

Frequently asked questions

How long does it take to get test results?
Test results are usually available within 1–3 business days, depending on your lab. Follow up with your provider if you have questions about the timing.
Can I drink water before this test?
Yes, you can drink water as needed, but avoid caffeine or alcohol before the draw if your provider recommends it.
Does this test detect other drugs?
No, this test specifically measures benzoylecgonine. If you’re concerned about other substances, ask your provider about additional tests.
  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