These ions are passed through an electromagnetic filter which sorts the particles based on their molecular weight. A detector counts the number of ions with each specific mass and feeds this data into a computer. All positive test results showing the presence of drugs are sent to the lab's Chief Toxicologist for review, after which they are also entered into the Automated Results Program.
This level is not available through the Automated Results Program, but First Check customers may call to speak with a First Check Customer Service Representative, who will disclose these levels. The nanogram level cannot tell you how much of a drug was used nor will it indicate a time frame as to when a drug was used.
It may be helpful, however, in monitoring a chronic or everyday user of marijuana to determine when the drug is leaving the system. The GC-MS is both incredibly sensitive and accurate. With a GC-MS test properly designed to identify all potential compounds, the risk of a false positive is virtually zero. It is even more useful because it can detect both the presence and levels of each specific drug. Given the complex nature of the GC-MS drug test, it tends to require a high amount of expertise to conduct and analyze.
The equipment is intricate and must be appropriately maintained. Because it cannot detect polar, non-volatile and thermally labile compounds, these compounds must be pre-treated before undergoing testing via GC-MS.
This is usually accomplished via derivatization, which increases the volatility and thermal stability of these compounds.
It can also take longer to complete and receive the results of the GC-MS test. Depending on the lab and the involvement of a Medical Review Officer MRO , the general rule is between 24 and 72 hours after the initial hour test result period for a confirmatory test.
These limitations mean that the GC-MS tends to be more expensive and often takes longer to complete than other tests, including the immunoassay test. It is also why it is the GC-MS is most often employed in drug testing when the results of other types of urine tests produce unexpected results.
The structure of a GC-MS test is also critical. If the GC-MS test is not designed to detect a specific drug analyte, it will not identify it. Most false negatives with the GC-MS test are the result of the test not being prepared to identify a potential compound specifically.
However, this rarely happens in professional laboratories. Human error is the cause of most of the limitations of the GC-MS drug test. It can detect even trace amounts of certain drugs and provides peace of mind that your drug testing program is working as it should.
Written by Jennifer Crump. Jennifer Crump is a former freelance journalist and author and now full-time content writer and strategist. She contributes to magazines and blogs throughout North America on issues related to business, training, financing and workplace safety.
By: Elly McGuinness. A positive drug result can only come from a report provided by a laboratory. Most importantly, please note that a positive test may not mean the use of illicit drugs as medications including painkillers and sleeping tablets can return positive drug test results.
It is recommended for those workplaces that are inexperienced in interpreting drug results to consider the use of an Occupational Medical Doctor or Medical Review Officer MRO to review the results and provide advice.
That is to say, the confirmatory testing can determine drug concentration levels and if the result may be consistent with medications, foodstuffs or illicit drug use. The original instant urine sample can usually be divided up and sent for testing. Furthermore, saliva confirmation testing requires a second saliva sample to be sent to the laboratory. For more information about drug and alcohol screening, please contact us. For instant drug screening, Jobfit generally uses a multi drug 6 Panel urine drug testing kit which tests for illicit drugs including:.
0コメント