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Serum or plasma concentration of secobarbital (barbiturate metabolite)

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

This test measures the amount of secobarbital, a barbiturate medication, in your blood. It helps doctors assess drug levels, especially after recent use or overdose.

Quick summary

["This test helps monitor medication safety and response to barbiturate treatment."]

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

Key facts at a glance

LOINC
4029-5
Short code
Secobarbital Ur Ql
Synonyms
Secobarbital Ur Ql
Category
chemistry
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

Why This Test Is Done

Doctors may order this test if you’ve been prescribed secobarbital (a sedative/hypnotic) or if you’ve experienced symptoms like confusion, drowsiness, or breathing difficulties. It may also be done after an overdose to confirm exposure or guide treatment.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw from a vein in your arm. If you’re taking blood from a catheter, the process may be slightly different. Always follow your healthcare provider’s instructions.

What the Test Results Mean

Results are reported as a concentration (e.g., micrograms per milliliter). High levels may indicate overdose or improper metabolism. Low levels could suggest recent discontinuation or poor absorption. Your doctor will interpret results in the context of your symptoms and medical history.

Common Reasons for Testing

This test is primarily used in emergency settings or during acute monitoring (e.g., after a suspected overdose) to assess barbiturate exposure. It may also be part of a broader toxicology screen if barbiturates are suspected in poisoning.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Secobarbital level

Frequently asked questions

What does a high level of secobarbital mean?
High levels may indicate recent ingestion of secobarbital or barbiturate-containing medications. This can lead to severe symptoms like coma, respiratory depression, or even death. Your doctor will adjust treatment (e.g., supportive care, activated charcoal) based on the result.
How long does it take to get results?
Results are typically available within 24 hours, depending on lab processing times. In emergency situations, results may be available sooner. Follow-up with your healthcare provider for next steps.
Can I drink alcohol before this test?
No, avoid alcohol before testing as it may interfere with lab results or affect your safety. Follow your doctor’s specific instructions regarding fasting or other restrictions.
  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