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Amphetaminesusubqlscn

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

This test checks for the presence of amphetamines (stimulant drugs) in a sample, using blood serum to screen for illegal or controlled substances.

Quick summary

{"This test detects amphetamines and related stimulant drugs in your blood","A positive result means amphetamines were found in the sample","The test is used for clinical monitoring, workplace testing, or forensic analysis","False positives can occur—confirmation testing may be needed","Results are confidential but may be shared with healthcare providers"}

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

Key facts at a glance

LOINC
8156-2
Short code
Amphetamines Usub Ql Scn
Synonyms
Amphetamines Usub Ql Scn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
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 is this test?

The Amphetamines Screen test is a laboratory test that looks for the presence of amphetamines in your blood serum. Amphetamines are a class of stimulant drugs that include methamphetamine (meth), MDMA (ecstasy), and prescription medications like Adderall and Dexedrine. This test uses a screening method to detect whether these substances or their metabolites are present in your bloodstream.

How is the test performed?

A healthcare professional will draw a small sample of blood from a vein in your arm. This blood sample is then sent to a laboratory where it is processed to separate the serum (the liquid part of blood) from the blood cells. The serum is analyzed using specialized equipment to detect the presence of amphetamines or their breakdown products (metabolites). The test is designed as a screening tool, meaning it identifies samples that may contain these substances. Positive screening results typically require confirmation with a more specific test.

Why might I need this test?

Your healthcare provider may order this test for several reasons: to monitor patients on prescription amphetamine medications, to investigate symptoms of drug intoxication or overdose, as part of a workplace drug testing program, or in forensic or legal investigations. The test may also be used in emergency room settings when a patient presents with unusual symptoms that could be related to stimulant use.

What do the results mean?

A negative result means no amphetamines were detected in your sample at the time of testing. A positive result indicates that amphetamines or related substances were detected. However, because this is a screening test, a positive result does not confirm the specific substance or amount present. Follow-up confirmation testing is usually performed to verify positive results. It's important to discuss your results with your healthcare provider, who can explain what they mean in your specific situation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How long do amphetamines stay in my blood?
Amphetamines can typically be detected in blood serum for about 24-48 hours after use, though this varies depending on the specific substance, dose, individual metabolism, and frequency of use. Chronic or heavy use may result in longer detection windows.
Can my diet or medications affect the test results?
Certain prescription medications, over-the-counter drugs, and dietary supplements may potentially cause false-positive results. It is important to inform your healthcare provider about all medications and supplements you are taking before the test. Some cold medications and antidepressants may cross-react with the screening test.
Will the test show if I legally take ADHD medication?
Yes, this test will detect prescription amphetamines like those used for ADHD (such as Adderall, Vyvanse, or Dexedrine). If you have a valid prescription, inform the testing facility and your healthcare provider. A positive result from legitimate prescription use should be interpreted in light of your medical history.
Is the test confidential?
Test results are protected under medical privacy laws (such as HIPAA in the United States). Results are typically shared only with you and your authorized healthcare providers. However, if the test is part of a workplace or legal investigation, results may be shared with your employer or relevant legal authorities per applicable laws and consent agreements.
Do I need to fast before this test?
No fasting is typically required for this blood test. However, you should follow any specific instructions provided by your healthcare provider or the testing facility. Stay well-hydrated, as this can make blood draw easier.
  1. 1
    MedlinePlus - Drug TestingSource
  2. 2
    Mayo Clinic Laboratories - Amphetamines ScreenSource
  3. 3
    LabCorp - Amphetamines ScreenSource

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