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Oxazepam/Creatinine Ratio, Urine

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

A urine test measuring the oxazepam benzodiazepine relative to creatinine, helping assess drug exposure while accounting for urine concentration.

Quick summary

["A detectable result can indicate oxazepam exposure, but it should be interpreted with your medications and medical history."]

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

Key facts at a glance

LOINC
58368-2
Short code
Oxazepam/Creat Ur
Synonyms
Oxazepam/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 test measures oxazepam, a benzodiazepine medicine, in urine. Oxazepam is compared with urine creatinine to help account for how concentrated or dilute the urine sample is.

Why might I need this test?

It may be ordered to document exposure to prescribed or nonprescribed benzodiazepines, monitor medication use, or evaluate a result in a drug-testing program. The result alone does not establish misuse or impairment.

How is the test performed?

A urine specimen is collected and analyzed in a laboratory. The report compares the amount of oxazepam with the amount of creatinine in the sample.

How do I prepare for the test?

Collect the urine sample at the time and in the container specified by the laboratory or clinician. If a timed collection is requested, collect all urine for the full period. Do not stop prescribed medicines without medical advice.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Oxazepam

Frequently asked questions

What does a detectable urine oxazepam result mean?
It indicates that oxazepam, or a medicine that is converted to oxazepam in the body, was present in the urine. It may reflect appropriately prescribed use, accidental exposure, or another situation that requires clinical review.
Why is the result compared with creatinine?
Urine can range from very concentrated to very dilute. Comparing oxazepam with creatinine helps reduce the effect of urine concentration and makes results from different samples more comparable.
Does a positive result mean someone drove or operated a vehicle?
No. The test does not determine impairment, timing of use, or whether a person was safe to drive. Those questions require additional clinical and behavioral information.
  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