They separate the molecules in your urine and test each one. It is done with a program so the chances are very slim of the program messing up when its separating the molecules and testing them.
Don't do drugs.
Generally no, confirmation gc/ms is run when initial test come positive or "non-negative". But some company (employee testing) pay for this test also.
LCMS (actually) LCMS/MS goes the half way for newborn screening. Its then the GCMS which comes for rescue. It clarifies the results given by LCMS and says with accuracy whether it is a positive or a negative case, against what was indicated in the LCMS screening. GCMS is mostly based on urine sample while LCMS needs blood spots. Thats where GCMS already scores a big point above LCMS. Further, GCMS "confirms" a disorder, while LCMS stops at "maybe". GCMS tests for a massive range of disorders while LCMS is limited to a few class of disorders. GCMS is the future of screening, while LCMS is the present of screening.
Yes, it will show in a laboratorydrug and alcoholtest as an opiate. If you declare it, your test can be sent for a GCMS which will further identify the opiate as a doxylamine, and you will pass your drug test.
From what ive read of them, they arent cheap, bordering from 100-300 dollars per gas spectrometer test. But they are VERY accuratee, and usually only used to confirm a positive reading on a preliminary test, such as a urine test.
Yes. Ritalin will definitely give you a positive ua for amphetamine
Nope, lidocaine, and benzocaine will never provide cross reactivity on a cocaine EMIT assay, or GCMS.
gas chromatography mass selective detector
For quantification of unknown analyte
There are two ways to beat GC/MS. One is substitution. The other is to quit doing drugs. GC/MS can detect adulterants. It can even tell you what the person used.
URINE DRUG TEST RESULTSyes; the presumptive test will be positive for amphetamines and the GCMS test will be negative. This would indicate that you did not take a true amphetaMINE. yOU WILL HAVE THE OPPORTUNITY TO IDENTIFY ANY AND ALL OTC AND RX MEDS TAKEN; HONESTY IS THE BEST POLICY PROVIDED YOU HAVE A VALID PRESCRIPTION FROM A PHYSICIAN.
The absorbance level assumed to be the limit for positive samples