In 2019, the latest DTI data available, overall positivity rate for hair drug testing was 11.2% for the general U.S. The Quest Diagnostics Drug Testing Index™ (DTI) offers insights into trends in workforce drug drug use based on positivity results for de-identified laboratory testing for a range of illicit, legal, and prescription drugs. What is the positivity rate for drug tests using hair? Moreover, the risk is minimized because every hair drug test collection is observed. We have not found any adulterants that can beat a hair drug test at this time. However, head should not be mixed with body hair-eg, it is acceptable to combine hair collected from various locations on the scalp but not from the scalp and leg. If a donor has little or no hair, hair can be collected from various locations and then combined. C an a hair test be performed on a person with little or no hair? In general, the amount needed equates to a single row of hairs approximately one (1) centimeter wide. Quest Diagnostics standard screen usually requires a cosmetically undetectable lock of hair preferably snipped from the back of the head, just below the crown. How much hair is cut for a hair drug test? True hair follicle testing requires the hair to be “plucked” rather than cut which can lead to extreme donor discomfort. During a hair drug test collection, the hair is cut as close to the scalp as possible, so only the strands of hair above the scalp is tested and not the actual hair follicle. The hair follicle is actually the pocket, below the scalp, from which the hair strand grows. What is the difference between hair testing and hair follicle testing?Ĭalling a hair test a hair follicle test is a common misnomer. Therefore, a hair analysis of 3.9 centimeters covers a time span of approximately 90 days and detects a pattern of drug use over this time frame. The standard length of hair tested by the laboratory is the first 3.9 centimeters or 1½ inches from the root end. Head hair grows approximately 1.3 centimeters or a ½ inch per month. It takes approximately 5 to 10 days for hair containing drug to reach the outer environment on top of the scalp to be collected based on the average rate of head hair growth. Drugs in the bloodstream are able to incorporate and bind to the hair follicles underneath the scalp. Hair follicles underneath the scalp are surrounded by a dense network of capillary blood vessels. Will the test results from a hair test reflect drug use over the past 90 days? Here are a few of the most commonly asked questions about hair testing. Due to its observed collection, a donor’s efforts to prepare for or cheat a hair drug test are largely ineffective. Hair drug testing expands the detection window of drug use for up to 90 days.
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