The MDL procedure now uses method blanks to calculate an MDL, in addition to the spiked samples that have always been used to calculate the MDL.The 2016 revision of the MDL procedure (Revision 2) differs from Revision 1.11 of the MDL procedure in three significant ways. The previously promulgated version of the MDL procedure (Revision 1.11) stated: “The method detection limit (MDL) is defined as the minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero and is determined from analysis of a sample in a given matrix containing the analyte.” The MDL procedure is designed to be a straightforward technique for estimation of the detection limit for a broad variety of physical and chemical methods. Questions from the 2015 Methods Update Rule.
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