Hair Drug Test and Urine Drug Test - FAQ

What is Hair Drug Testing?

Since each hair has it own directly blood supply, the ingestion of any illegal drugs will be transport by blood and trapped by the hair, which can be revealed by analyzing a small sample of hair. Our testing method measures the drug molecules and the metabolites embedded inside the hair shaft, eliminating external contamination as a source of a positive test result. Hair testing results cannot be altered with shampoos or other external chemicals.

What drugs are included in a standard Hair Drug Test?

7 Types of Commonly Abused Drugs (total 19 specific drugs or their metabolites) can be determined: 
Amphetamines (Amphetamine /Methamphetamine & Ecstasy), Cocaine Metabolite (Cocaine & Benzoylecgonine), Opiates (Codeine, Morphine & 6-monoacteyl Morphine), Marijuana Metabolites, Ketamine and Benzodiazepines (
Alprazolam, Clonazepam, Diazepam, Lorazepam, Nordiazepam, Oxazepam, Temazepam)

These seven drug classes are mandated for testing by the U.S. Federal Government and specially focused on Asian region.

We can extend the routine 7 Panel Test (19 drugs) test to a 10 Panel Test (23 drugs) upon requested by the client

What time period does a standard test cover?

A standard screen covers a period of at least 90 days, depending on the length of the tested hair. The hair sample is cut as close to the scalp as possible and the most recent 1.5 inches are tested.

How much hair is needed?

A standard screen with GC/MS confirmation requires at least 0.1 grams of hair or approximately 90 to 120 strands. The thickness of different types of head hair (thick coarse vs. thinning fine) is the reason for this variation.

How does Hair Testing compare to urinalysis?

The primary differences are:
I) Wider window of detection
II) Inability to tamper with the test

Cocaine, methamphetamine, opiates, ketamine and Benzodiazepinesare rapidly excreted in urine and undetectable in urine 72 hours after use. The detection period for hair is limited only by the length of the hair sample, i.e. the longer the hair sample, the longer the history of drug taken can be unveiled.

At this time there are no known adulterants for hair tests. Since hair tests analyze the drugs inside the hair shaft, external contaminants/chemicals have no effect.

Additional advantages include non-intrusive collection procedures, virtual elimination of test evasion.

The combination of an increased window of detection and resistance to evasion makes Hair Testing far more effective than urinalysis in correctly identifying drug users.

What is the shortest time period that can be evaluated?

The minimum time period is approximately two weeks (1/4 inch).

Can tests be run on people with little or no hair?

Hair can be collected from several head locations and combined to obtain the required amount of hair. In addition, body hair may be used as a substitute to head hair. Body hair can be used if head hair is too short for a test. If body hair is used the timeframe represented by the test is approximately one year, due to the different growth pattern in hair below the neck.

Does body hair give the same type of results as head hair?

Yes, body hair can be used to test for any drug exposure, though body hair growth patterns are different than head hair. Most body hair is replaced within approximately one year. This means a test done with body hair will be reported as drug usage during approximately a one-year timeframe.

How does the cut-off levels established?

The cut-off levels generally accepted industry-wide. These levels are based in part by minimum detection levels for GC/MS confirmation.

Will Liquid Chromatography Mass Spectrometry (LC/MS) or Gas Chromatography Mass Spectrometry (GC/MS) confirmation of all positive hair results?

Our laboratory provides confirmation-utilizing LC/MS or GC/MS for all specimens that screen positive.

Can hair be affected by cross-reacting substances such as over-the-counter medications?

Enzyme-immunoassay antibodies (EIA), similar to those used to test urine, are used for the initial screening test for drugs of abuse in hair; therefore the potential for substances such as over-the-counter medications to cause a false positive screening result does exist. To eliminate the possibility of reporting a false positive due to cross-reactivity, we confirm all positive results by LC/MS or GC/MS.

Does external exposure to certain drugs, like marijuana or crack smoke, affect the Hair Test results?

To rule out the possibility of external contamination, we (where appropriate) test for both parent & metabolite (bi-product) of drug usage. For marijuana analyses, we detect only the metabolite (THC-COOH). This metabolite is only produced by the body and cannot be an environmental contaminant.