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Get to know work procedure of drug test using hair.

Hair drug testing gets higher popularity in safety critical environment. It is fact that you can able to detect drug presence even after period of 90 days. Basically hair drug testing is useful to screen for different drug classes like Marijuana, Cocaine Opiates Meth/amphetamines & Ecstasy and Phencyclidine. Process of hair testing is not that complex. Drug test using hair required approximately 50-60 hair strands cut closely from scalp. They should have approximate diameter as that of shoelace tip. Laboratory then check hair samples for the drug presence. Test required minimum 1.5 inch length hair strands. If you look at the fact sheet, hair grows 05 inch/ month. That means each 05 inch of the hair strand represents one month. However, in analysis part only most recent one 1.5 inch hair strands are taken into consideration. This point should be taken into consideration as laboratories take only 1.5 inch long hair strands from the root. That is why no need to submit longer hair. It is only for the confirmation of 90 days time period.

However, if one need to detect drug presence having long historical periods it is possible to check with hair drug test. In such case, it is essential to have hair strands of minimum 3 inch. You can carry out test with the two samples. One is for the first drug test kits, cut 1.5 inch long from scalp and another sample can be of remaining hair. It is vital to place root ends of the hair samples properly aligned or as per detected on the testing kit. One another advantage of the hair drug testing on urine testing is that, here a chance of getting false positive result is minimal. In urine drug screening drug test false positive results are much extensive and almost 10-30% is comes as false positive result.

With hair drug test you can check out presence of metabolites together with parent drug substance. That is the reason, hair drug testing fail to recognize any external contamination. For e.g. if you check for marijuana, then laboratories are only able to detect drug metabolites THC-COOH. Furthermore, this body only able to produce metabolites and no any environmental condition. As a confirmative analysis you can perform gc/ms testing on hair.