Home >> Laboratory Drug Testing (Urine, Saliva or Hair Follicle)
Laboratory Drug Testing (Urine, Saliva or Hair Follicle)
Drug tests can be divided into two general groups. The first group is the kind most people are familiar with. This type of testing involves the donor giving a sample of some bodily fluid or hair to an employer, doctor, law enforcement official, or a medical testing center. This is normally a sample of urine, blood, hair, or saliva/ oral fluid. After collection from the donor, the sample is sealed with a tamper-evident seal and sent to a laboratory for analysis. The primary advantages of this type of test are accuracy, legal defensibility, and the ability to customize tests for a particular demographic group. The disadvantages are typically costs associated with the need for collection sites (urine, blood), and the delay in receiving results (up to 4 days.)
Hair testing is quite accurate and can go back 6 months or longer, showing any controlled substances used in a sort of timeline. As hair grows out, any drugs used are encased in the hair shaft, so the longer the hair, the longer back in the individual's drug history the lab can detect. Most legitimate testing facilities, however, only use hair within about 3-5 cm of the scalp, and discard the rest. This limits the detection history to about 90 days, depending upon the rate of growth of the individual's hair. Some people attempt to circumvent this through shaving their heads. In the absence of the required amount of hair on the scalp, body hair can be used as an acceptable substitute. Additionally, for pre-employment hair testing, the inability to obtain a sample may be grounds for not hiring the individual.
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