What is the gold standard for drug testing?
What is the gold standard for drug testing?
The most sophisticated drug-testing approach is gas chromatography coupled with mass spectrometry (GC/MS), which is regarded as a “gold standard”; it is used in confirmatory testing.
What makes a drug screen invalid?
An invalid drug test is the outcome of a drug test for a urine sample that contains an endogenous substance at abnormal concentrations, has abnormal physical characteristics, contains an unknown interfering substance, or an unknown contaminant that prevents the laboratory from obtaining a suitable valid result on the …
What is the best drug testing method?
Hair, Saliva or Urine—Which Is Best for Drug-Testing Job…
- Urine, which is by far the most prevalent, with 90 percent of employers using it, according to background screening firm HireRight.
- Saliva, used by 10 percent of employers.
- Hair, used by 7 percent of employers.
What is the best sample specimen for drug testing?
Urine is the most widely used matrix for drugs of abuse testing. The advantages of urine specimen include that it is well known specimen, drugs concentrate in the urine and analytically it is an easy sample to work with.
What happens if a drug test is inconclusive?
Inconclusive/invalid– this means that the test detected no amount of the drugs tested for. With an inconclusive result, your employer may choose to have you retake a drug test.
What are the levels on a drug test?
CUTOFF LIMITS
| Substance | Initial drug test level (immunoassay) (ng/mL) | Confirmatory drug test level (GC-MS) (ng/mL) |
|---|---|---|
| Cocaine metabolites c Benzoylecgonine. | 300 | 150 |
| Opiate metabolites | 2000 | 2000 |
| Phencyclidine | 25 | 25 |
| Amphetamines | 1000 | 500 |
Is an at home drug test as accurate as a lab test?
No. No drug test of this type is 100% accurate. There are several factors that can make the test results negative even though the person is abusing drugs.
What’s the most reliable drug test?
It is very important to send the urine sample to the laboratory to confirm a positive at-home result because certain foods, food supplements, beverages, or medicines can affect the results of at-home tests. Laboratory tests are the most reliable way to confirm drugs of abuse.