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Amphetaminesusubql

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

A blood test that checks for the presence of amphetamine-type stimulants in a substance sample.

Quick summary

{"This test detects amphetamines (such as methamphetamine, MDMA, or certain ADHD medications) in blood samples","It is commonly used in emergency, forensic, or workplace testing situations","Results can help identify substance use or exposure"}

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

Key facts at a glance

LOINC
8154-7
Short code
Amphetamines Usub Ql
Synonyms
Amphetamines Usub Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 [Presence] test is a laboratory analysis that detects whether amphetamine-type stimulants are present in a blood sample. Amphetamines include drugs like methamphetamine (meth), MDMA (ecstasy), and certain prescription medications used for ADHD (such as Adderall or Ritalin). This test does not measure the exact amount of drug but simply indicates whether any amphetamine substance is present.

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 is analyzed using specialized chemical tests to detect the presence of amphetamine compounds. No special preparation is typically needed, but you should inform your doctor about any prescription or over-the-counter medications you are taking.

What do the results mean?

A 'Positive' result means amphetamines were detected in your blood sample, indicating recent use or exposure to these substances. A 'Negative' result means no amphetamines were detected. However, the test has limitations—it may not detect very small amounts of drugs, and certain medications or substances can sometimes cause false positive results. Your doctor will interpret the results in the context of your medical history and situation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How long do amphetamines stay in your blood?
Amphetamines can typically be detected in blood for about 12-24 hours after use, though this varies depending on the specific drug, dosage, and individual factors like metabolism and kidney function.
Can prescription ADHD medications cause a positive result?
Yes. Prescription amphetamines used for ADHD (like Adderall, Dexedrine) or narcolepsy (like Modafinil) may cause a positive result. Always inform the testing facility about all medications you are taking.
Is fasting required before this test?
No fasting is typically required for this blood test. However, follow any specific instructions provided by your healthcare provider.
Can this test tell how much drug was taken?
No. This is a qualitative test that only indicates presence or absence of amphetamines, not the specific amount. Quantitative tests are needed to measure drug levels.
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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