Cocaine Blood Test in California

What this test measures

This test looks for cocaine and the compounds the body produces as it breaks the drug down. The main metabolite is benzoylecgonine, and other markers include ecgonine methyl ester, norcocaine, and cocaethylene, which forms when cocaine and alcohol are used together. Blood has a shorter detection window than urine, so it is most useful when recent use is the question. Screening immunoassays provide a fast initial answer.

The sample is collected by venipuncture at a partner laboratory. An immunoassay screens for cocaine-related compounds, and any non-negative screen is usually confirmed with a chromatographic method such as gas chromatography mass spectrometry or liquid chromatography tandem mass spectrometry. That two-step approach reduces false positives from substances that can cross-react with the initial assay. Specimen handling follows chain-of-custody procedures when required.

People order this test in emergency or clinical settings, as part of a workplace program, or for other testing programs that allow blood specimens. It is not a diagnosis of a substance use disorder and cannot establish impairment on its own. Results should be reviewed by the authorized professional managing the testing program, and clinical questions belong with a qualified healthcare provider.