ChangZhou Realhealth Medical Devices Co., LTD.

Alcohol Testing Products

Saliva Alcohol Test Strip

  • Introduction

    SEO Rapid Alcohol Test is intended for use as a rapid method to detect the presence of alcohol in saliva for blood alcohol concentration (BAC) greater than 0.02%. It has been published that the concentration of alcohol in saliva is almost equal to that in blood.
    The rapid test is intended for the semi-quantitation of ethyl alcohol in human saliva. To confirm the concentration of positive specimens, an alternate, non-enzymatic technology such as headspace gas chromatography should be used.


    Alcohol intoxication can lead to loss of alertness, coma, death and as well as birth defects. The BAC at which a person becomes impaired is variable. The United States Department of Transportation (DOT) has established a BAC of 0.02% (0.02g/dL) as the cut-off level at which an individual is considered positive for the presence of alcohol. 1-3
    Determination of ethyl alcohol in blood and saliva is commonly used for measuring legal impairment, alcohol poisoning, etc.  Gas chromatography techniques and enzymatic methods are commercially available for the determination of ethyl alcohol in human fluids.  SEO Rapid Alcohol Test is designed as the screen tool to rapidly determine if the BAC level is higher than 0.02% by testing saliva specimen.


    SEO Rapid Alcohol Test is based on the high specifity of alcohol oxidase (ALOx) for ethyl alcohol in the presence of peroxidase and enzyme substrate such as tetramethylbenzidine (TMB) as shown in the following:

    The distinct color on reactive pad could be observed in less than 20 seconds after the tip was contacted with saliva samples with the ethyl alcohol concentration greater than 0.02%. It should be pointed out that other alcohols such as methyl, propanyl and allyl alcohol would develop the similar color on the reactive pad. However, these alcohols are not normally present in saliva.

    1. Instruction for use
    2. SEO Rapid Alcohol Test

     Each test contains these materials:
    Tetramethylbenzidine (TMB)        0.12mg
    Alcohol oxidase (EC)               0.5 IU
    Peroxidase(EC)                0.35 IU
    Proteins                      0.15mg

    1. Timer or clock

    1. For in vitro use only.
    2. Do not use the product beyond expiration date.
    3. Handle all specimens as potentially infectious.
    4. The product is sensitive to the presence of alcohol and moisture.    After open the package, the test device should be used immediately.

    1. Nothing should be placed into the mouth of the subject for at least 10 minutes prior to saliva collection. This includes food, drink, tobacco products or other materials.
    2. Saliva specimen can be collected in a sputum cup or a clean container, or directly applied to the reaction pad of the test strip.
    3. Avoid contact with skin by wearing gloves and proper laboratory attire.

    Good laboratory Practice recommends the daily use of control material to validate the reliability of device. Commercially available controls that contain sodium azide or other preservatives that will inhibit the enzyme activity cannot be used with SEO Rapid Alcohol Test.
    SEO Rapid Alcohol Test may be qualitatively verified by using a test solution prepared by adding 10 drops of ethanol alcohol into 8 oz of distill water. This solution should show a distinct positive result.

    1. Open the foil package and remove the test strip.
    2. Saturate the reactive pad by dipping the reaction pad into the saliva specimen collected in a sputum cup, or by applying saliva directly to the reaction pad. After 10 seconds, shake off the excess saliva.
    3. Immediately start timer and at 2 minutes, compare the reactive pad with the provided colored chart.
    Results after more than 2 minutes may be not accurate

    Negative: Almost no color change by comparing with the background. The negative result indicates that the BAC is less than 0.02%.
    Positive: A distinct color developed all over the pad. The positive result indicates that the BAC is 0.02% or higher.
    Invalid: The test should be considered invalid If only the edge of the reactive pad turned color that might be ascribed to insufficient sampling. The subject should be re-tested.

    SEO Rapid Alcohol Test is designed for use with human saliva only. A positive result indicates only the presence of alcohol and does not indicate or measure intoxication.
    There is a possibility that technical or procedure error as well other substances in certain foods and medicines may interfere with the test and cause false results. Please refer to “ Interference” section for list of substances that will interfere the test results.
    SEO Rapid Alcohol Test is a semi-quantitative assay. It identifies alcohol in human saliva at a concentration of 0.02% BAC.
    1. Accuracy
    The following data were obtained based on 86 clinical saliva samples.
    GC(+)    (>0.02%BAC) GC(-)
    SEO Strip(+) 37 5*
    SEO Strip(-) 1 43
    Sensitivity Specifity Agreement
    98% 90% 93%
    * The alcohol concentration was between 0.09-0.016g/dL.
    B. Detection Limit
    Detection limit at least at 10mg/dL (0.01g/dL)
    C. Interference
    The following substances may interfere with the SEO Rapid Alcohol Test:
    Strong oxidizers           Ascorbic acid
    Tannic acid                 Polyphenolic compopunds
    Mercaptans           Uric acid
    Bilirubin                Oxalic acid
    These compounds are not normally present in sufficient amount in saliva to interfere with the test. However, the precautious step must be taken so that these materials are not introduced into the mouth during the 10 minutes test period proceeding to the test.

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