Cocaine Drug Testing Kit Instructions
Cocaine is an alkaloid found in the leaves of a coca plant. It has been used medicinally as an anesthetic agent, but its addictive property has minimized its modern daily use. As a potent central nervous system stimulant, cocaine has been defined as a controlled substance by the National Institute on Drug Abuse. Cocaine is excreted in urine primarily as benzoylecgnonine in a short period of time. Benzoylecgnonine has a biological half-life of 5 to 8 hours, which is much greater than that of cocaine; generally, it can be detected within 24-60 hours after a cocaine use.
The One Step Test for cocaine is a lateral flow, one-step, competitive immunoassay. This one step test is fast and easy to use; the results are read visually without the need for instrumentation. The test system employs unique monoclonal antibodies to selectively identify cocaine and its metabolites in urine samples with a high degree of sensitivity. The cut off concentration for cocaine and its metabolites is 300 ng/mL; the concentration set by the National Institute on Drug Abuse for the qualitative detection of cocaine in human urine. This product is not intended to monitor drug levels, but only to screen urine for the presence of cocaine and its metabolites.
Note: This test provides only a preliminary analytical test result which should be confirmed by a more specific method. Gas chromatography / mass spectrometry (GC/MS) has been established as the preferred confirmatory method by the National Institute on Drug Abuse (NIDA). Clinical consideration and professional judgment should be applied to any drug of abuse test result, particularly when preliminary positive results are indicated.
PRINCIPLE OF THE TEST
The One Step Test for Cocaine is based on the principle of a competitive inhibition immunoassay, in which a chemically labeled drug (drug conjugate) competes with the drug which may be present in urine, for limited antibody binding sites. The test device consists of a membrane strip, which is pre-coated with cocaine-BSA conjugate on the test band region, and a colored anti-cocaine monoclonal antibody-colloid gold conjugate pad, which is placed at the end of the membrane.
In the absence of drug in the urine, the colored antibody-colloid gold conjugate moves with the sample by capillary action along the membrane until it reaches the immobilized drug conjugate in the test band region. At this point, the antibody colloidal gold conjugate reacts with the pre-coated drug conjugate and forms a visible red colored line as the antibodies form complexes with the drug conjugate. Therefore, the formation of a visible color line on the test band region shows the urine sample tested for cocaine is negative.
When the drug is present in the urine, the drug/metabolite antigen will compete with the drug conjugate coated in the test band region for the limited antibody sites. When a sufficient concentration of drug is present, it will fill the limited antibody binding sites, and thus will prevent attachment of the colored antibody colloidal gold conjugate to drug conjugates pre-coated in the test band region. Therefore, absence of the color band on the test region indicates a positive result.
A control band with a different antigen/antibody reaction is also added to membrane strip to indicate that the test is performed properly. This control line should always be seen. A negative urine sample produces two distinct color bands, and a positive sample produces only one color band in the control zone.
A fresh urine specimen should be used, no special pre-treatment is necessary. The specimen may be refrigerated (2-8oC) and stored up to 2 days, or frozen (-20oC or below) prior to assaying. If samples are refrigerated they should be brought to room temperature before testing.
INTERPRETATION OF RESULTS
Negative: In addition to one pink colored control (C) line in the control region, a distinct pink colored line will also appear in the patient test (T) region. The color intensity of the test line may be weaker or stronger than that of the control line.
Positive: Only one colored line appears in the control (C) region. No apparent line in the patient test (T) region. This indicates the presence of a drug/metabolite at a level of 300 ng/mL or above.
Invalid: No line appears in the control zone “C”. An invalid result may be due to improper testing procedures or deterioration of the kit components. Repeat the assay sequence using a new device.
Note: A faint line on the test region indicates the cocaine in sample is near the cut-off level for the test. These samples should be retested or confirmed with a more specific method before a clinical determination is made.
STORAGE AND STABILITY
The test kit can be stored at temperatures between 2 to 30°C in the sealed pouch to the date of expiration. The test kit should be kept away from direct sunlight, moisture and heat.
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