hair analysis

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hair analysis

Etymology: AS, haer + Gk, a loosening
chemical analysis of a hair sample to find possible evidence of exposure to a toxic substance. Molecules of lead compounds and other chemicals are absorbed and stored in hair shafts. Hair analysis is also used to determine possible causes of malnutrition. Samples for analysis are taken from areas close to the scalp to eliminate chances that toxic chemicals found in the hair may have been absorbed from air pollutants.
The use of scalp hair as a primary analytical specimen
Mainstream medicine Hair analysis is of limited usefulness in trace element analysis
Quackery Hair analysis is allegedly useful for evaluating health and nutritional status, protein and vitamin levels
Substance abuse The use of samples of hair to detect chronic drug abuse
Methods RIA, EIA, GC/MS
Drugs detected Amphetamines, cocaine, heroin
Levels of detection 10 pg or 10 ng/mg of hair
Toxicology The most reliable use of hair analysis is to detect chronic heavy metal poisoning—e.g., arsenic, lead, mercury

hair analysis

The use of scalp hair as primary analytic specimen Mainstream medicine HA is of limited usefulness in trace element analysis  Substance abuse The use of samples of hair to detect chronic drug abuse Methods RIA, EIA, GC/MS Drugs detected Amphetamines, cocaine, heroin Levels of detection 10 pg or 10 ng/mg of hair Toxicology The most reliable use of HA is to detect chronic heavy metal poisoning–eg, arsenic, lead, mercury

hair a·nal·y·sis

(hār ă-nali-sis)
Testing for retrospective purposes when blood and urine can no longer be expected to contain a particular contaminant; most widely used in forensic toxicology and environmental toxicology; used controversially in alternative medicine.
References in periodicals archive ?
One golden-brown hair sample came from an animal shot by a hunter in Ladakh, India, 40 years ago.
Analysis on a hair sample bought from a friend of the singer's barber suggests that Elvis could have suffered from a heart muscle disease.
DNA analysis on a hair sample thought to have come from Presley has revealed the singing icon, who died in August, 1977, at his Graceland home, could have suffered from a heart muscle disease.
Another time, a drug-abusing mum was caught wearing a wig when someone tried to take a hair sample.
Craig said: "Before we release the red squirrels we clip a hair sample from their tail to take for testing.
Tie hair sample 3/4" from root end with cotton thread.
Lawyers of a woman whose death sentence was finalized in May last year for a 1998 curry poisoning incident that killed four people in Wakayama have asked a local court for a reanalysis of the woman's hair, saying earlier analyses that found arsenic in her hair sample were erroneous, sources close to the matter said Monday.
In the studies, adverse neurodevelopmental abnormalities were found at a range of maternal mercury levels based on results of hair sample analyses.
For example, one hair sample used in Ehleringer's study came from a man who had recently moved from Beijing, China, to Salt Lake City.
One hair sample that Ehleringer and his colleagues analyzed came from a donor who had recently moved from Beijing to Salt Lake City, a move chronicled in the hair that grew in the 6 to 8 weeks following the change in residence.
Each hair sample, defined as the total number of deer hairs on an individual barb, was placed in a separate envelope and air dried until analysis.
It would have been easier, faster and much cheaper to mail a hair sample for DNA testing.