UCSF Navigation Bar

UCSF Departments of Pathology & Laboratory Medicine Home Page

Lab Manual for UCSF Clinical Laboratories

Lab Manual for SFGH

Internal Resources

Click here for more information about laboratory operations and procedures

If you have additional questions regarding this test, please call: 415-353-1667

Search Our Test Menu

Amphetamine Screen, Urine

Item Value
Approval req'd? No
Available Stat? Yes
Test code AMPU
Test group Amphetamine
Performed by Parnassus Chemistry
In House Availability Test available 24 hours per day 7 days per week
Method Competitive enzyme immunoassay method (Beckman UniCel DxC 800 analyzer) using G6PDH-labeling
Container type Urine cup
Amount to Collect See preferred volume
Sample type Random urine
Preferred volume 1 mL urine
Min. Volume 0.5 mL urine
Normal range Negative

Note: a negative result indicates that this class of drugs is not present, or they are present at a concentration below the cut-off concentration of 1000 µg/L
Stability Refrigerated 1 week, frozen at -20C 2 weeks
Turn around times STAT 2 hours, Routine 4 hours
Additional information
A concentration of < 1000 µg/L is considered negative by this test. A positive result is ≥ 1000 µg/L and indicates the presence of this class of drugs. This immunoassay is only a screening test and is not definitive. Results cannot be used for medico-legal purposes.

This assay detects amphetamine and methamphetamine and has some cross reactivity with MDA (methylenedioxyamphetamine) and MDMA (methylenedioxymethamphetamine; ecstasy).

Click here for List of Cross Reactive Substances

False positive results may occur due to other cross reacting substances, however, positive results are NOT routinely confirmed by a second method. If confirmation of the test result is required, it is the responsibility of the physician to separately order a specific confirmatory test for the drug identified. Contact laboratory at x 31667 to request confirmatory testing. Confirmation test code AMPC. Samples are held for 7 days. False negative results are also possible, for example, with use of newer designer amine compounds.

Amphetamine can be detected in urine from 24 hours up to 9 days after use. Methamphetamine can typically be detected 1.5-6 days after use. (From: Verstraete AG. Detection Times of Drugs of Abuse in Blood, Urine and Oral Fluid. Ther Drug Monit, 26(2) April 2004, 200-205).
LOINC code 19343-3
Last Updated 3/24/2013 7:36:57 PM
Entry Number 54
Lab Procedure Link Click here for Procedure
UCSF home page UCSF home page About UCSF Search UCSF UCSF Medical Center