Frequently Asked Questions


The Drug Line is lighter than the Control Line. Does this mean some drug is present?
What is meant by a Preliminary Positive Result?
How do I know if the First Check Home Drug Test worked properly? What if I am unsure of the result?
How soon can I read my results?
When is the best time to take the test?
Are there any factors that can affect the test result?
What cut-off levels do First Check Home Drug Tests use for detecting drugs in urine?
Why don’t First Check Home Drug Tests use “zero” as the cut-off level for detecting drugsin urine?
How soon after taking a drug can you detect it in urine with a First Check Home Drug Test and how long can a drug be detected in urine?
Is a white line considered a Preliminary Positive Result?
If I test negative with a First Check Home Drug Test, does this guarantee I will test negative on other drug tests administered by a professional?
If I send a urine sample to First Check’s laboratory for confirmatory testing, do I need to give my name, address and telephone number?
Are First Check Home Drug Tests CLIA waived?
How do I ship your sample to the lab?

How accurate are First Check® Home Drug Tests?

  •  Many First Check® Home Drug testing products are more than 99 percent accurate in detecting specific drugs in urine. The accuracy of the test depends on several factors such as how close to the cut-off level the drug is in your urine, how soon the test was administered after ingesting a drug, and how much of the drug was used or ingested.

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The Drug Line is lighter than the Control Line. Does this mean some drug is present?

  • No. Any line next to the word Drug or the drug abbreviation (depending on the test you have purchased), no matter how dark or light, is considered a Negative Result and no further testing is required. It is possible that the intensity of the lines will vary among the drugs being tested for due to a variety of reasons such as; how diluted the urine is, the pH or protein level of the urine, or interference from a metabolite in the urine that closely resembles the drug.

    What is meant by a Preliminary Positive Result?
    • The First Check Home Drug Test is considered a “screening test.” We recommend all Preliminary Positive Results be sent to our laboratory for free confidential confirmatory testing. Gas chromatography/mass spectrometry (GC/MS) is considered the gold standard in laboratory testing for most drugs.

    How do I know if the First Check Home Drug Test worked properly? What if I am unsure of the result?
    • The test is working properly as long as a red or pink colored line appears next to the word Control or the letter C (depending on the test you have purchased).
    •  The result is Negative when a red or pink colored line appears next to the word Drug or the drug abbreviation (depending on the test you have purchased).
    • The result is Preliminary Positive when NO line appears next to the word Drug or the drug abbreviation (depending on the test you have purchased).
    • If you have questions about your results call 1-888-788-5716 to speak with one of our First Check representatives.
    • If you are unsure about your results please re-test using a new First Check Home Drug Test.

    How soon can I read my results?
    • You can read your results after 5 minutes as long as a red or pink colored line has appeared next to the word Control or the letter C.
    • Disregard all results after 10 minutes.

    When is the best time to take the test?
    • Use first morning urine when possible as this urine tends to be the most concentrated urine of the day making it best for detecting any drugs that may be in the system.
    • However, First Check Home Drug Tests can be used any time of day.

    Are there any factors that can affect the test result?
    • Certain over-the-counter medications or prescription drugs may cross-react with the First Check Home Drug Test and cause a Preliminary Positive Result.
    • The test will only give accurate results on fresh human urine samples. Old or diluted urine samples may not be suitable for testing.
    •  If you are testing someone else, keep in mind that First Check Home Drug Tests are only as accurate as the urine sample being tested. Samples can easily be “adulterated” (i.e., contaminated or tampered) with common household products such as bleach and other liquids if you’re not closely supervising the entire process.
    • This test provides a screening result only. It is not designed to determine the actual concentration of a drug, the level of intoxication nor is it to be used for legal purposes.

    What cut-off levels do First Check Home Drug Tests use for detecting drugs in urine?
    • The cut-off level for each drug varies (depending on the type of drug) and is measured in nanograms (ng/ml).
    •  Although First Check Home Drug Tests are designed to detect a very small amount of a drug in urine, if the amount is below the established cut-off level, you may test negative for that drug even though you may have taken the drug.

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    Why don’t First Check Home Drug Tests use “zero” as the cut-off level for detecting drugs in urine?
    • First Check uses standard cut-off levels to help to reduce the likelihood of false-positive
      screening results which can occur when using a zero cut-off level.

    How soon after taking a drug can you detect it in urine with a First Check Home Drug Test and how long can a drug be detected in urine?
    • Most drugs can be detected in urine with a First Check Home Drug Test within a few hours after taking the drug; however this can vary depending on the type of drug taken, the amount taken, the frequency of use, and the metabolism of the person being tested.
    • Each drug is cleared by the body at different rates. Some drugs, for example marijuana, can stay in the body for up to several weeks after use.

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    Is a white line considered a Preliminary Positive Result?
    • Yes. A white waxy looking line in the Drug Window (sometimes referred to as a “ghost line”) is considered a Preliminary Positive Result and should be sent into the lab for confirmatory testing.
    • A Negative Result can only be based on the appearance of a red or pink colored line in the Drug Window. Even if the line in the Drug Window is very faint, as long as there is some red or pink color to it, it is considered a Negative Result and should not be sent to the lab for confirmatory testing.

    If I test negative with a First Check Home Drug Test, does this guarantee I will test negative on other drug tests administered by a professional?
    • Many First Check® Home Drug testing products are more than 99 percent accurate in detecting specific drugs according to the designated cut-off levels. However, if a more sensitive test is administered, there is a chance of testing positive if drugs are present in urine.

    If I send a urine sample to First Check’s laboratory for confirmatory testing, do I need to give my name, address and telephone number?
    • No, it is not necessary to include your name, address or phone number with your sample.
    • Samples are run using the anonymous Identification Number included on the Identification Label in the test kit and all testing in our laboratory is strictly confidential. You will need this Identification Number to retrieve results, so keep it in a safe place. If you include your name or return address on the shipping label, this information will not be documented in any fashion.
    • For more information on shipping your sample to our laboratory for confidential confirmatory
      testing See Below. 

    Are First Check Home Drug Tests CLIA waived?
      • For more information on CLIA, please refer to the FDA website

       


      How do I ship your sample to the lab?

      • Step 1: Attach Identification Label
        • Attach Identification Label to the Collection Cup and place check mark in the box for the drug(s) that gave a Preliminary Positive Result.
        • Attach the lower portion of the Identification Label to the designated location on the insert and store in a safe place.
        • Important: Without this Identification Label, we will be unable to test your sample and you will need this number to retrieve your results.
      • Step 2: Place Test in Box
        • Make sure the Test Lid is securely fastened to the Collection Cup then place it in the Plastic Transportation Bag.
        • Seal bag and place into the Pre-Addressed Mailing Box.
      • Step 3: Ship Sample
        • Close Pre-Addressed Mailing Box and secure with packing tape.
        • Samples should be mailed within 24 hours of collection.
        • Important: The mailing box is not pre-paid. To ensure prompt delivery, be sure to pay the mail service the appropriate shipping charges.

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