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Serum or plasma concentration of secobarbital (barbiturate drug)

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

This test measures the amount of secobarbital, a barbiturate medication, in your blood. It helps doctors assess your current level of exposure to this drug, which may be important after overdose, poisoning, or recent administration.

Quick summary

["This test helps determine if you’re at risk of drug-related complications or need medical intervention."]

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

Key facts at a glance

LOINC
12500-5
Short code
Secobarbital Stl Ql
Synonyms
Secobarbital Stl Ql
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test if you’ve been exposed to secobarbital—such as through accidental ingestion, suicide attempt, or recent medical treatment. It can also be used to monitor your response to the drug or check for toxicity in certain medical settings.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The test is quick and typically done in a lab setting.

What the Results Mean

Results are compared to a general reference range, but exact values depend on factors like your medical history, dose, and timing since exposure. High levels may indicate overdose or severe poisoning, while low levels suggest insufficient drug presence.

Common Causes of Abnormal Results

Elevated levels may occur after recent ingestion, overdose, or improper medication use. Very low levels might mean the drug has cleared your system too quickly or you’re not taking it as prescribed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Secobarbital Level

Frequently asked questions

Why might I need this test if I’ve taken secobarbital?
Your doctor may order it to check if your blood contains dangerous levels of the drug, especially if you’ve had symptoms like drowsiness, confusion, or breathing difficulties. It helps guide treatment decisions, such as supportive care or antidote administration.
How soon after taking secobarbital will I need this test?
Timing depends on the dose and your metabolism. Some tests may be done shortly after exposure (within hours), while others could be scheduled later if needed for long-term monitoring.
Can I drink water before this blood test?
Yes, you can drink water unless your doctor specifies otherwise. Avoid alcohol or caffeine before the test, as they might affect your blood composition or test results.
  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