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Barbiturate (Drug Screen) in Urine

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

This test checks for the presence of barbiturate drugs in your urine, which are a type of sedative or sleeping pill sometimes used medically or abused.

Quick summary

["A barbiturate drug screen helps identify if barbiturates were recently consumed."]

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

Key facts at a glance

LOINC
32111-7
Short code
Secobarbital Spec Ql
Synonyms
Secobarbital Spec Ql
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

Why This Test Might Be Ordered

Your healthcare provider may order this test if you’ve been suspected of using barbiturates, if you’re experiencing symptoms like drowsiness, confusion, or breathing difficulties, or if you’re under medical supervision for substance use monitoring.

What to Expect During the Test

You’ll provide a urine sample in a sterile container. The lab will analyze it for barbiturate compounds using a sensitive detection method. No special preparation is needed, but avoid drinking alcohol or certain medications before testing if instructed.

What the Results Mean

A positive result indicates the presence of barbiturates in your urine, which may suggest recent use. A negative result means no detectable barbiturates were found. Results are qualitative (present or absent) rather than quantitative, so they don’t provide exact amounts.

Common Uses and Considerations

This screen is often used in medical settings to assess substance use, monitor treatment plans, or guide decisions about care. It’s important to note that barbiturates can be harmful in high doses and may interact with other medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Urine Drug Screen for Barbiturates

Frequently asked questions

What does a positive result mean?
A positive result suggests recent barbiturate exposure, which could indicate misuse, accidental ingestion, or medical use. It’s critical to discuss your results with your healthcare provider, as barbiturates can be dangerous and require proper management.
How soon after use will the test detect barbiturates?
Barbiturates may be detectable in urine for several days after use, depending on the specific drug and your metabolism. However, the test only confirms presence or absence, not the exact timing or amount.
Can false positives or negatives occur?
False positives are rare but possible due to cross-reacting substances in urine. False negatives can occur if the drug was used shortly before testing or if the sample was improperly collected. Your provider can clarify results based on clinical context.
  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