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Understanding Your Laboratory Test: A Patient's Guide to What It Is, Why You Need It, and How to Interpret Your Results

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

A urine test that detects the presence of barbiturates, a class of sedative medications, in your system.

Quick summary

{"This test checks for barbiturate drugs (sedatives) in your urine","It is used for monitoring medication use, detecting overdose, or workplace drug testing","Results can show if you have taken barbiturates within the past few days to weeks","Positive results indicate recent barbiturate use","Follow your healthcare provider's instructions for sample collection"}

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

Key facts at a glance

LOINC
53746-4
Short code
BARBU
Synonyms
Barbiturates Pnl Ur
Category
chemistry
Sample
serum
Container
Sterile urine collection container, preferably a plastic screw-cap specimen cup without preservatives; red-top urine transport tube acceptable for chain-of-custody specimens
Units
N/A
Ref low
0
Ref high
200
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
Immunoassay screening with confirmation by Gas Chromatography-Mass Spectrometry (GC-MS) or Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
CPT
80307
SNOMED
272210001
Specimen volume
30-50 mL random urine specimen; minimum 10 mL required for analysis
Stability
Room temperature: 24 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days. For forensic specimens, follow chain-of-custody storage requirements.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–72 hours
Order
routine

This test is a laboratory evaluation that measures specific substances or markers in a sample from your body, giving your healthcare provider important information about how your organs and body systems are functioning.

The Barbiturates panel is a urine test that detects the presence of barbiturates in your urine. Barbiturates are a class of prescription sedative medications that were historically used to treat anxiety, insomnia, and seizures. While they have largely been replaced by safer medications, they may still be prescribed in certain situations or may be detected as illicit substances.

Your provider may order this test to help diagnose a new health problem, monitor a condition you already have, check how well a current treatment is working, or screen for potential issues before any symptoms appear.

Your healthcare provider may order this test for several reasons: to monitor if you are taking your prescribed barbiturate medication as directed, to check for drug overdose or poisoning, to evaluate unexplained symptoms like severe drowsiness or confusion, or as part of routine drug screening for employment or legal purposes.

The test is usually performed by a trained healthcare professional who collects a small sample, such as blood or urine, in a clinic or laboratory setting. The procedure is typically quick, and most people experience only minor, brief discomfort.

You will provide a urine sample in a sterile container. For accurate results, follow any specific instructions provided by your healthcare provider or testing facility. The sample is then sent to a laboratory where it is analyzed using immunoassay techniques followed by confirmatory testing if needed.

Your results are compared against established reference ranges. Values within the normal range generally suggest typical function, while values that are higher or lower may point to a condition that needs further evaluation. Always review your results with your healthcare provider to understand exactly what they mean for your health.

A negative result means no barbiturates were detected in your urine at the time of testing. A positive result indicates that barbiturates were found in your urine. The specific level and type of barbiturate can provide additional information about when the drug was taken and how much. Your healthcare provider will interpret these results in the context of your medical history and current medications.

Reference range

Negative: <200 ng/mL (cutoff varies by laboratory). Positive result indicates presence of one or more barbiturate compounds above the established screening threshold.N/A

Specimen: serum

No special preparation required. Patients should be informed that certain prescription and over-the-counter medications may produce positive results. Inform the laboratory of all medications currently being taken.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is clinically significant for monitoring patients prescribed barbiturates for seizure disorders or sedation, detecting intentional or accidental overdose, identifying drug misuse or abuse, and fulfilling regulatory or workplace testing requirements. Barbiturate use can lead to serious side effects including respiratory depression, drowsiness, confusion, and in severe cases, coma or death. Detecting these drugs helps healthcare providers manage patient safety and appropriate treatment.

Frequently asked questions

How long do barbiturates stay in urine?
Barbiturates can be detected in urine for several days to weeks after use, depending on the specific drug, dose, frequency of use, and individual factors like metabolism and kidney function. Short-acting barbiturates may be detectable for 2-4 days, while long-acting ones can be detected for up to 3 weeks.
Will this test show if I have a prescription?
The test can detect barbiturates in your system but does not distinguish between prescribed and non-prescribed use. If you have a valid prescription, inform your healthcare provider and the testing facility before the test. They may verify your prescription with your pharmacy.
Can over-the-counter medications affect the results?
Some over-the-counter medications and supplements are unlikely to cause a positive result. However, certain drugs or substances may occasionally cause false positive results. Always inform your healthcare provider about all medications, supplements, and substances you are taking.
Is fasting required before this test?
No fasting is typically required for a urine barbiturate test. You can eat and drink normally before providing the sample unless otherwise instructed by your healthcare provider.
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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