Drug testing kits use rapid immunoassay method to give positive or negative results based on the concentration of a substance in the human urine.

The rapid immunoassay works based on the predetermined cut-off levels to detect substances. For example, immunoassay may not detect all opioids, but can give false positives even though there has been no drug use. Immunoassay detects how the drug interacts with the body’s immune system and its ability to form antigen-antibody complexes, but does not measure the drug quantity. The most widely used bioanalytical method is the instant immunoassay, which is quick and accurate to detect specific molecules. This is because the substance has bound itself to the chemistry within the test and prevented the formation of lines. In the case of positive test result, the test line will be absent for the corresponding drug being tested. If the specimen is contaminated or adulterated, the control line will not form. When reading the test results, a control line at the top of the drug test strip is seen within the device and a test line below which is present for corresponding drugs tested. Even a faint line in the Test Region is considered as a NEGATIVE TEST RESULT, which means the test has not detected any trace of that particular substance. On the drug test, results don’t vary based on the intensity of the coloured lines. It is significant to understand the interpretation of drug test results (including faint lines) to make a confident decision. What does a faint line on drug test mean?įaint lines are very common on drug tests regardless of screening method being employed. Urine drug test is employed to detect the presence of certain illegal drugs and prescription medications (COC, MMJ, MAMP, PCP, Methadone, Opioids, and many others).

Does a faint line indicate a negative result?.What causes a faint line on the drug test?.

Is a faint line on a drug test still negative?.

Does a faint line mean presence of drug in the urine?.

What does a faint line on drug test mean?.

The most commonly used among various methods of drug testing is the urine drug test since it is quick, cost efficient and accurate. A faint line on a drug test is considered a NEGATIVE Test Result, which means the test has not detected any trace of that particular substance.

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