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JWH-018 Pentanoate/Creatinine Ratio, Urine

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

A urine test for a JWH-018 metabolite, normalized to creatinine, that may help identify recent exposure to this synthetic cannabinoid.

Quick summary

["A detectable result may indicate exposure to JWH-018, but it does not by itself show impairment or how long ago exposure occurred."]

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

Key facts at a glance

LOINC
72783-4
Short code
JWH-018 pentanoate/Creat Ur
Synonyms
JWH-018 pentanoate/Creat Ur
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

This urine test measures a metabolite associated with JWH-018, a synthetic cannabinoid sometimes called a “spice” substance. The result is compared with the urine creatinine level to account for differences in urine concentration.

Why might I need this test?

This test may be used in substance-use evaluation, workplace or school screening, or when a clinician needs objective evidence of possible JWH-018 exposure. It is not usually part of a routine physical examination.

How is the test performed?

A urine specimen is collected and analyzed in the laboratory for the JWH-018 pentanoate metabolite. The laboratory reports the result relative to urine creatinine as a mass ratio.

How do I prepare for the test?

Follow the collection instructions provided by the healthcare professional or laboratory. No fasting is generally required, but unusual fluid intake or dilution of the urine sample can affect interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A detectable or elevated result may indicate exposure to JWH-018. A negative result does not completely exclude exposure because the metabolite may not yet be present, may have already cleared, or the test may not detect a particular product. The result should be interpreted with timing, symptoms, other findings, and the specific laboratory method.

Short name

JWH-018 metabolite, urine

Frequently asked questions

Does this test prove that someone was impaired?
No. The test can indicate exposure, but it cannot determine intoxication, driving impairment, or the exact time of use by itself.
How long can JWH-018 be detected in urine?
Detection depends on the amount used, frequency of use, individual metabolism, and the laboratory method. Urine testing generally reflects a more recent window than blood testing, but it cannot establish a precise time of exposure.
Why is the result compared with creatinine?
Creatinine is used as an adjustment for urine concentration. This helps reduce the effect of unusually concentrated or diluted urine on interpretation.
  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