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  • You are here: Home / DUI Defense / DUI Blood Test / DUI Blood Samples Lab Analysis

    DUI Blood Samples Lab Analysis

    DUI Blood Samples Lab AnalysisThe crime lab analysis of DUI blood samples is critical to your DUI case. From the accreditation of the lab, preparation of the samples and the instruments used in testing, there are numerous potential pitfalls.  Below you will find a brief overview of the different ways blood samples analyzed in DUI cases.

    Different DUI Blood Samples Processes 

    The most common form of BAC (Blood Alcohol Content) called Gas Chromatography, a process in which a sample of blood analyzed using a Gas Chromatograph instrument.  Gas Chromatography is currently the most popular method for analyzing BAC levels in DUI blood samples of suspects.  Furthermore, there are two methods of Gas Chromatography analysis, Headspace Gas Chromatography and Direct Injection Chromatography.  In addition to Gas Chromatography, another less commonly used method called the Enzymatic Method.

    Headspace Gas Chromatography

    In Headspace Gas Chromatography, a nonvolatile solution added to the blood sample.  An internal standard typically also added to the blood for quantitation purposes.  A technician places the vial containing the blood sample into a closed container.  The sample then heated.  Upon heating, a vapor forms, filling the space (called the "headspace") between the vial and the top of the container.  Once the vapor reaches equilibrium,  a sample of the vapor is taken and injected into a gas chromatograph instrument.  This instrument tests the concentration of alcohol that was present in the head space vapor.

    Direct Injection Chromatography

    Direct Inject Chromatography also commonly used.  In this testing procedure, instead of measuring the alcohol levels in the headspace vapor.  The blood itself injected into the chromatography instrument.   This method considered by some to be more reliable then the headspace method.

    Enzymatic Method

    The Enzymatic Method not commonly encountered by DUI defense attorneys.  It's more technical and expensive.  Moreover, only highly sophisticated labs can perform this method.  Labs equipped with properly trained technicians and special machines.

    Dichromate Method/Kozelka-Hines Method

    Not specifically developed for testing ethyl alcohol, this method presents problems of mistaking other chemicals as alcohol, leading to a false reading.

    Related Articles

    DUI Chemical Tests And The Law  -  Three types of DUI Chemical Tests are used to attempt to measure Blood Alcohol Content (BAC). They are breath tests, blood tests, and urine tests.

    The Different Types of DUI Breath Tests  -  Different types of DUI breath tests can be used to detect levels of alcohol present on a person's breath.

    House Arrest and Home Detention in DUI Cases  -  House arrest is a great alternative for both the government and the DUI offender.

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