Urine drug test strips are a popular and inexpensive way to screen for the use of drugs. These easy to use tests determine if a certain level of drugs, also known as the detection level, are present in someone’s urine. The test does not tell you how much or how little of the drug is present , but only if it is above the detection level for the test.
How to Read a Drug Test
The intensity of the color of a line on the drug test does not mean anything and should not be interpreted as a measure of the amount of drugs. A faint line on a drug test is still a line, so if you have a faint line in the “T” area of the test then you have a negative drug screen. As you can see in the negative test results photos below, the THC strip is much lighter in color than the OXY test strip, but the test result is still negative.
One of the most common questions we receive is about the faint lines on a drug test and we have confirmed this answer with the manufacturer of the tests – the intensity of the color of the line does not mean anything on the test. Any line in the “T” region of the test strip, dark or very light, is considered a negative test.
What is an INVALID test result?
No line appears in the Control Region (C).
The most likely reasons for this are insufficient specimen volume, incorrect procedural techniques or a faulty test. Please read the directions again and repeat the test with a new test card. If result is still invalid, please contact us at our drug testing forums.