can gc ms be wrong?
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If a false positive is suspected on a POC immunoassay-based urine drug screen, results can be confirmed using gas chromatography–mass spectrometry (GC–MS). Although GC–MS is more accurate than an immunoassay, it also is more expensive and time-consuming.
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You Suspect That The Percent Difference Between Color-coded And Measured Values Could Be Due To Error In The Meter.
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For the most part it's not that well-known that method validation is a much more rigorous process. What's really needed, more likely, is the establishment of a verification regime that assures analytical methods perform reliably, accurately, and precisely for its intended application.
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Upon analysis of the results, a hypothesis can be rejected or modified, but it can never be proven to be correct 100 percent of the time. For example, relativity has been tested many times, so it is generally accepted as true, but there could be an instance, which has not been encountered, where it is not true.
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For diabetic patients: This medicine may cause false test results with urine sugar tests and urine ketone tests. If you have any questions about this, check with your health care professional, especially if your diabetes is not well controlled.
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Since multiples are always greater than or equal to the number, and factors are always less than or equal to, we can say that multiples will always be bigger than factors, and so the LCM is greater than the GCF. Assuming the two numbers aren't the same.
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In the MPN method, there is statistical bias and lack of precision inherent in it [5] . ... [2] have demonstrated that the MF method gives results equivalent to those given by the MPN method even with chlorine-stressed Coliforms.
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There is no DfES or GTC number - both are actually the TRN. Use that number. The reason for the different fields apparently is obscure - probably because different teachers were issued with different forms of number at different periods.
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You may not get accurate results What home allergy kits are testing for is not always clear. For example, some kits do not test for specific IgE antibodies, so their results may not reflect an actual allergy. Some home tests may measure immunoglobulin G (IgG) antibodies instead of IgE antibodies to foods.
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Gas chromatography mass spectrometry (GC/MS) is an instrumental technique, comprising a gas chromatograph (GC) coupled to a mass spectrometer (MS), by which complex mixtures of chemicals may be separated, identfied and quantified.
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GC/MS targets small and volatile molecules GC/MS begins with the gas chromatograph, where the sample is volatized. This effectively vaporizes the sample (the gas phase) and separates its various components using a capillary column packed with a stationary (solid) phase.
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In gas chromatography, it is often difficult to properly resolve components completely without using a technique known as temperature programming. ... This changes the retention time compared to a isothermal run, but if the same temperature 'ramp' is used, the elution times will remain constant for each component.
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LCMS (Liquid Chromatography coupled to Mass Spectrometry) is applied mainly for the analysis of thermally unstable molecules in complex samples. ( Example, analysis biological fluids) GCMS (Gas Chromatography coupled to Mass Spectrometry) is applied mainly for the analysis of volatile compounds in complex samples. (
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The clinical course of MS does not appear to “run true” in families if more than one family member is affected. Thus, if you develop MS, you cannot assume that you will have the same disease course as your mother, sister, or other relative with MS.
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Abstract. Amoxicillin has been causally linked in the lay and medical literature to false-positive urine drug screens for cocaine metabolites. An exhaustive search of the peer-reviewed medical literature revealed no data to support this link.
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There are many possible explanations for obtaining anomalous results. Human errors can lead to data which is anomalous and a lack of precision whilst taking measurements is one possible explanation. Using inappropriate measuring equipment could create problems too.
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Book Error - an error has occurred during testing. It may be that: The Absorbent Sampler was not kept pointing downwards or the test was not laid flat after urine was applied. • Too much or too little urine was applied. You should test again using a new test taking care to follow the instructions.