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Designation: D6259 − 23 An American National StandardStandard Practice forDetermination of a Pooled Limit of Quantitation for a TestMethod 1This standard is issued under the f i xed designation D6259; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers the use of standard regressiontechniques and data from an interlaboratory study to determinea lower quantitative limit for a test method. This determinedlower limit represents the numerical limit at or above which thetest results are considered to be quantitatively meaningful forcommerce or regulatory activities by this practice. It is def i nedby this standard as the pooled limit of quantitation (PLOQ) forthe test method.1.2 This practice is applicable to test methods that arecapable of producing numerical test results close to zero.Examples are those test methods that determine quantitativelythe concentration of analyte(s) near zero.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2D6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels, and LubricantsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 Def i nitions:3.1.1 repeatability conditions, n—conditions under whichtest results are obtained with the same test method in the samelaboratory by the same operator with the same equipment in theshortest practical period of time using test units or testspecimens taken at random from a single quantity of materialthat is as nearly homogeneous as possible.N OTE 1—By in the shortest practical period of time is meant that thetest results, at least for one material, are obtained in a time period not lessthan in normal testing and not so long as to permit signif i cant change intest material, equipment, or environment. See Terminology E456.3.2 Def i nitions of Terms Specif i c to This Standard:3.2.1 pooled limit of quantitation (PLOQ), n—level ofproperty or concentration for a test method at which the ratio:[10× pooled repeatability standard deviation of results for aconcentration level/concentration level] = 1.3.2.1.1 Discussion—Quantitative test results obtained usinga test method at or below its PLOQ is expected to have anuncertainty of 630 % or greater at the 95 % conf i dence level.3.2.2 pooled repeatability standard deviation, n—the statis-tically pooled standard deviation for results obtained underrepeatability conditions over multiple operators/laboratoriesfor a sample that is obtained in accordance with PracticeD6300 or other equivalent Interlaboratory Study (ILS) analysis(for example, Practice E691, ISO 4259).3.2.3 laboratory limit of quantitation (LLOQ), n—level ofproperty or concentration for a test method at which the ratio:[10× repeatability standard deviation of results for a concen-tration level determined in a single laboratory/concentrationlevel] = 1.3.2.3.1 Discussion—Quantitative test results obtained bythis single laboratory at or below its LLOQ is expected to havean uncertainty of 630 % or greater at the 95 % conf i dencelevel.3.3 Acronyms:3.3.1 ILS, n—interlaboratory study.1 This practice is under the jurisdiction of Committee D02 on PetroleumProducts, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-mittee D02.94 on Coordinating Subcommittee on Quality Assurance and Statistics.Current edition approved May 1, 2023. Published May 2023. Originallyapproved in 1998. Last previous edition approved in 2019 as D6259 – 15 (2019).DOI: 10.1520/D6259-23.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1