Can a hair follicle test go back 6 months?

Can a hair follicle test go back 6 months?

When tested, each centimetre of hair therefore reflects one month’s history of drug use (or non-use). This is why hair strand testing is able to provide such a large window of detection, assessing drug use as far back as 6 months.

How far back does a hair follicle test detect drugs?

How far back can a hair drug test detect drug use? Hair drug tests have the longest detection period, and can typically detect drug use for up to 90 days. Depending on the drugs used, a hair sample can sometimes help determine when drug use occurred and whether it’s been discontinued.

What can cause a false positive hair follicle test?

Prescription medications and certain foods, such as poppy seeds, may contain compounds that might lead to false positive results. Hair samples undergo a two-step process to ensure accurate test results.

What is a cutoff level for drug testing?

In the case of urine analysis, drug testing cutoff levels are measured in nanograms per milliliter (ng/ml). For example, an initial screening for marijuana must show at least 50 ng/ml, and then confirmatory tests must prove at least 15 ng/ml.

How can I get a false positive hair follicle test?

If hair is bleached, it may remove some drugs but allow other drugs to be absorbed by the hair. Additionally, some hair dyes contain substances such as hemp and other products that can lead to potential false positive results.

How long does it take to pass a 15 ng/mL drug test?

Using the 15 ng/mL GC/MS cutoff, the detec- tion time for the last positive urine sample (for six subjects following high dose smoking) was 122 hours—just over five days.

Does coloring your hair help pass a drug test?

During testing, the collected hair is washed and tested for environmental contamination that could change the results of the test. Your results won’t be affected if you wash your hair, dye your hair, or use styling products.

How do you deep clean hair follicles?

Rinse your hair with 1 cup of white vinegar and allow it to sit for at least 1 to 3 minutes, then use a clarifying shampoo. Follow with shine boost rinse or detox hair soak immediately after.