Amphetaminesusubqlcfm
A confirmatory blood test that detects the presence of amphetamines, a class of stimulant drugs, in your system.
{"This test uses a blood sample to confirm if amphetamine-type drugs are present","It is more accurate than initial screening tests","Results can help doctors understand recent drug use or monitor treatment"}
Key facts at a glance
- LOINC
- 8155-4
- Short code
- Amphetamines Usub Ql Cfm
- Synonyms
- Amphetamines Usub Ql Cfm
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- confirm
- 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?
This is a confirmatory blood test that checks for the presence of amphetamines in your blood. Amphetamines are a class of stimulant drugs that includes methamphetamine (meth), amphetamine (like Adderall), MDMA (ecstasy), and related substances. The test uses a confirmatory method, which is more precise than initial screening tests.
Why might I need this test?
Your doctor may order this test for several reasons: to check for drug use as part of a workplace or legal test, to monitor patients in substance abuse treatment, to evaluate unexplained symptoms that might be related to drug use, or to confirm results from a previous screening test.
How is the test performed?
A healthcare professional will draw a blood sample from a vein in your arm. The sample is then sent to a laboratory where it undergoes confirmatory testing using specialized equipment. This method is highly accurate and can identify specific types of amphetamines.
What do the results mean?
A negative result means no amphetamines were detected in your blood at the time of testing. A positive result indicates that amphetamines or related substances were found. Your doctor will discuss what the results mean for your specific situation, as some medications or medical conditions might affect the results.
Are there any risks?
The risks are minimal and similar to routine blood tests. You may experience slight bruising or soreness at the needle site. In rare cases, fainting or infection may occur.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
How long do amphetamines stay in blood?
Will prescription medications affect my results?
Do I need to fast before this test?
How long does it take to get results?
Sources
- 1
- 2
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.
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