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Cocaine Screen, Urine

Item Value
Test Update Information Effective 01/14/2013, the platform used for the cocaine metabolite immunoassay screen has changed from the Abbot Axsym to the Beckman UniCel DxC 800.
Approval req'd? No
Available Stat? Yes
Test code COCU
Test group Cocaine
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 cocaine metabolite is not present, or it is present at a concentration below the cutoff concentration of 300 µg/L
Synonyms benzoyl-ecgonine
Stability Refrigerated 7 days, frozen at -20C 2 weeks
Turn around times Stat 2 hours, Routine 4 hours
Additional information Cocaine use is measured as the benzoylecgonine metabolite. A concentration < 300 µg/L is considered negative by this test. A positive result is ≥ 300 µg/L and is consistent with possible presence of this metabolite. This immunoassay is only a screening test and is not definitive. Results cannot be used for medico-legal purposes.

Benzoylecgonine can be detected within 1-3 days after use and can be detected as long as 22 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)

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.

Samples are held for 7 days. Contact laboratory at x 31667 to request confirmatory testing. Confirmation test code: COCAC

Click here for List of Cross Reactive Substances
LOINC code 3397-7
Last Updated 1/18/2013 12:05:37 PM
Entry Number 241
Lab Procedure Link Click here for Procedure
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