Hair Follicle Testing: How It Works


What is hair follicle testing? What is the process of testing hair follicle? You will find answers in this article.

Hair Follicle

With the help of a small hair sample it is possible to identify what specific drugs were used by the person who is being tested.

How does a drug get into hair follicle?

Hair, as it grows, is nourished by blood. If there are drugs in blood, they will eventually reach hair and will be embedded in hair shaft. It takes approximately one week after a drug was consumed for hair that is affected by a drug to grow above the scalp. No matter whether drugs were ingested smoked, orally, injected or snorted, metabolites are produced when drugs are processed by the body.

What is the process of hair follicle testing?

Every hair drug test actually works on the same principle and is based on the same process of finding drugs in hair. For any hair follicle test, you need to provide a sample hair that can actually be taken from any part of your body. Usually, at least 100-120 strands of hair (that are at least 0.5 inch long) are needed. If your hair is 0.5 inch long, it can give a 30-day drug use history. If it is longer, for example 1.5 inch long, then you can get a 90-day drug use history (hair grows approximately 0.5 inch per month).

How effective is hair follicle testing?

Hair follicle testing is easy and quite accurate. When it comes to indentifying low-level drug consumption of such drugs as PCP, opiates, cocaine, and methamphetamine over an extended period of time, hair follicle tests are more effective in comparison to urine drug tests.

What drug types can be detected with the help of a standard hair follicle test?

  • Cocaine (Cocaine, Benzoylecgonine)
  • Marijuana
  • Methamphetamine (Ecstasy. Methamphetamine/Amphetamine)
  • Opiates (6-Monacteyl Morphine, Morphine, Codeine,)
  • Phencyclidine (PCP)
Posted in Passing a drug test | Tagged , , , | 2 Comments

2 Responses to “Hair Follicle Testing: How It Works”

  1. Howard Goetterman says:

    If you shave your hair then let it grow back how long will it still show up. Does this speed up the clenseing process?

  2. a friend says:

    all bull aside i passed a hair test in 30days. this was in 1996 for gordon food service. my head was shaved so they cut it outta my armpits. i had only smoked weed at that time and even told them i had quite 31 days prior. they said take it anyway and called me and said your hired in three days.

    hope this helps

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