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Opioid Substance Involvement Screening Score (Serum/Plasma)

Published: August 9, 2026Updated: August 17, 2026

This test uses a blood sample to assess the likelihood of recent opioid use based on specific biomarkers. It’s not a direct test for opioids but evaluates patterns that may indicate exposure.

Quick summary

["This score helps healthcare providers understand if recent opioid use may be a factor in your health concerns."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
95510-4
Short code
STREETOPIOIDSSUBSTANCEINVOLVEMENTSCORE
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
0.5 N/A – —
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
nida
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

What This Test Measures

The test evaluates multiple blood biomarkers that collectively contribute to an overall score. These biomarkers may include metabolites of opioids or other substances that reflect recent substance involvement. The score is calculated based on the presence and concentration of these markers, not a single measurement.

How the Test Works

Instead of measuring opioids directly, the test looks at patterns in your blood that suggest opioid exposure. This approach helps identify potential substance involvement without pinpointing a specific drug.

Why It’s Done

Doctors may order this test if you have symptoms that could be linked to opioid use, such as confusion, respiratory issues, or withdrawal-like symptoms. It can also be used in cases where substance involvement is suspected but not confirmed by other tests.

What to Expect

You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab. Results are interpreted by a healthcare provider to guide further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

While this score doesn’t diagnose opioid use disorder or confirm specific drug use, it provides a useful tool for healthcare providers to assess risk factors. A higher score may prompt additional testing or discussions about substance use, but it doesn’t replace clinical judgment or patient history.

Short name

Opioid Involvement Score

Frequently asked questions

What does this test tell me about my health?
This test doesn’t show whether you’ve used opioids directly. Instead, it looks for patterns in your blood that may suggest recent exposure. Your healthcare provider will discuss the results with you and may recommend further testing or support if needed.
How accurate is this test?
The test is designed to be a screening tool, not a definitive diagnosis. It’s based on multiple biomarkers and helps guide further evaluation but isn’t foolproof. Accuracy depends on the clinical context and patient history.
Can I fast before this test?
No fasting is required for this blood test. However, always follow your healthcare provider’s instructions for any specific preparations, as they may vary depending on the test.
  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 17, 2026. · Read our editorial policy