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Zolpidem/Creatinine Ratio, Urine

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

A urine test that measures zolpidem relative to creatinine, helping account for differences in urine concentration.

Quick summary

["Detection of urine zolpidem indicates exposure to the sleep medication, whether prescribed or not."]

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

Key facts at a glance

LOINC
72771-9
Short code
Zolpidem/Creat Ur
Synonyms
Zolpidem/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 the sleep medicine zolpidem in urine. The result may also be compared with urine creatinine to help account for how concentrated the urine sample is.

Why might I need this test?

It may be ordered to check for zolpidem exposure during medication monitoring, drug screening, or evaluation of possible accidental or intentional overdose. A positive result alone does not show how the medication was taken or whether someone has impaired function.

How is the test performed?

A urine sample is collected and analyzed in a laboratory to detect zolpidem. When creatinine is included, its amount is used to adjust or normalize the zolpidem measurement.

How do I prepare for the test?

Follow the laboratory's collection instructions and tell the clinician about any prescription or over-the-counter sleep medicines you have taken. The timing of the last dose and the reason for testing can affect interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Zolpidem Screen

Frequently asked questions

Does a positive result mean someone took zolpidem without a prescription?
No. A positive result confirms exposure but cannot determine whether the medication was prescribed, taken accidentally, or taken intentionally.
Why is creatinine included in the test?
Urine concentration varies with fluid intake. Creatinine is used to help normalize the zolpidem result so results from samples with different concentrations can be compared more reliably.
How long after taking zolpidem can it be detected?
Detection depends on the dose, timing, urine concentration, and individual metabolism. If you need an interpretation for a specific situation, discuss the result with the ordering clinician.
  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