how far back can a hair drug test

While urine drug testing can typically look back a week hair follicle drug tests have a detection window of 90 days. The hair drug test can detect drugs going back approximately 7 to 90 days.

A Closer Look Drug Testing Panels Quest Diagnostics

Although there is no released research or tests it is suspected that the body hair test can be detected much further back as far back as a year.

. For these reasons an increasing number of companies choose it over a urine drug test for their safety-sensitive employees. Body hair can represent anywhere from a few months to a year of drug use though this varies between individuals. Second they can look further back into a persons history.

The biggest benefit of hair follicle testing is the long history it can provide. Its an optimal method for detecting long-term drug use because it can detect drugs used within the past 90 days. Hair testing is a method of drug testing approved by the US.

For very long hair segmental analysis can give a broader timeline. If the tester takes 2 Inches the detention time is increased by 30 days. However bear in mind that each and every individual has different hair growth rates and the time frame is only an approximate value.

Since human hair grows about a half an inch per month one and a half inches of hair is equal to a 90 day detection period. A hair drug test can detect all illicit drugs and some prescription drugs. They know that their tests become increasingly unreliable over time.

Whilst urine testing can provide results from a more recent timespan an average hair test can typically show around two to three months worth of drug use. Since drugs are detectable in hair for a long time testing hair determines prior use of drugs. Its a far better indicator of long-term patterened drug use as opposed to only recent drug activity.

It can pick up on drugs only as recent as seven days because it takes three to seven days for drugs to become embedded in hair. The standard 15-inch sample taken near the root provides a snapshot of drug use over the past 90 days. This is why drug test labs only claim to be able to go back 90 days.

To properly conduct a hair test a minimum sample submission size of 05 inches is required up to a maximum of 15 inches. The way that drug testing companies limit their test to a 90-day window is by only testing 15 inches of your hair closest to the scalp. Thats because the chemicals from the drugs that end up in.

Get the Most Out of Your Hair Tests with Our Easy-to-use Process. The results will not and can not detect the specific day of drug use. Lab technicians cut the hair to test length.

Hair Follicle Drug Tests can trace the usage of certain illegal drugs for an extended amount of time say a maximum of 90 days. If head hair it too short body hair can be used. Testing for Alcohol Use.

If the hair was 1 12 inch 90 days and so on. Ad Cleanse your hair of unwanted toxins with Aloe rid Zydot ultra clean hair shampoo. Many substances can be detected in hair.

The standard length of hair used for a drug test is only one and one-half inches. Hair drug tests can detect the consumption of foreign substances as far back as 90 days. Drug testing with hair can detect drug metabolites up to 90 days after abuse.

Typically hair tests can see as far back as 90 days using just 15 inches of hair although some tests can go back a full year. Sometimes marijuana doesnt show on a hair test. Hair follicle drug tests can identify drug use up to 90 days prior to the test date.

Depending on the length of the hair collected it can even go back as far as a year. The main reason behind the introduction of the hair follicle drug test is their accuracy and their longer detection period which other drug testing methods will find it difficult to trace over. Which Drug Test Goes Back the Furthest.

The hair follicle drug test when using the standard 15 inches of hair can detect previous drug use up to 3 months. Your hair grows at a rate of about one-half inch per month from the scalp. They immediately discard the unused portion.

Every half inch of hair corresponds to a drug abuse history of approximately 30 days. Its less invasive harder to cheat more accurate and it has a longer detection window meaning drug testing centers can look further back into an individuals history to see patterns of substance use and abuse. Follicle tests can detect drug use starting seven days back and up to 90 days back depending on how long the hair specimen is.

When the hair sample is taken from slower-growing body hair such as from the. Hair tests go back 90 days or more. For example a segment of head hair 15 inches from the scalp will represent up to 90 days of drug use.

With the rate that hair grows ten inches could provide over eighteen months of data. If a longer piece of hair is selected the drug test results can go back much further in fact years further to detect drug use. Hair closest to the head represents the most recent drug use.

Hair testing is more expensive than other types of drug tests such as urinalysis or saliva tests but its more accurate because the test cannot be fooled with. A sample of 40-50 hair strands is taken close to the scalp usually giving a drug detection of up to 90 days from 15 inches when taken to the laboratory for testing. This drug test is also difficult to cheat adulterate or substitute.

How Far Back Does it Test. With the urine drug test the applicant or employee might refrain from drug use for five or more days and. Most hair drug tests can detect heavy or regular use of certain illicit substances over the past three months.

Food and Drug Administration. Hair follicle testing doesnt test the hair follicles roots but rather the first 15 inches of growth. If the collector took a hair 1 inch long they can detect any drugs consumed on the last 60 days.

How far back can the hair follicle test go to detect drug use. Hair follicle drug testing is known for its accuracy and ability to detect drugs and medical cannabis use for up to 90 days after consumption unlike urine tests commonly used by employers in the United States. 15 inches of hair is needed for the standard 90 day drug test.

How A Hair Follicle Drug Test Works