Laboratory control sample definition

Laboratory control sample or “LCS” means a sample of an inert matrix or a matrix with a consistent concentration of the analytes of interest, fortified with a verified known amount of the analytes of interest. The purpose of an LCS is to determine whether the methodology is in control and whether the laboratory is capable of making accurate and precise measurements.
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Laboratory control sample or "LCS" means a sample matrix, free from the analytes of interest, spiked with verified known amounts of analytes or a material containing known and verified amounts of analytes. It is generally used to establish intra-laboratory or analyst specific precision and bias or to assess the performance of all or a portion of the measurement system. "Laboratory control sample" or "LCS" may also be named laboratory fortified blank, spiked blank, or QC check sample.
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Laboratory control sample. (LCS) means a blank matrix to which known concentrations of each of the target method analytes are added. The spiked concentration must be at a mid-range concentration of the calibration curve for the target analytes. The LCS is analyzed in the same manner as the representative sample.
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Examples of Laboratory control sample in a sentence

  • Laboratory control sample blank recoveries are used to measure accuracy.

  • Laboratory control sample (LCS) percent recoveries ranged from 57 to 109%, within the QC acceptance range of 38 to 158%.

  • Laboratory blank—See Method blank Laboratory control sample —See Ongoing precision and recovery (OPR) standard Matrix spike (MS)—A sample prepared by adding a known quantity of organisms to a specified amount of sample matrix for which an independent estimate of target analyte concentration is available.

  • The contents of the QC summary package include:• Cover sheet;• Laboratory case narrative;• Cooler receipt forms;• COC copy;• Analytical results;• Surrogate summary forms;• Blank summary forms;• Laboratory control sample summary forms; and• Matrix spike/matrix spike duplicate/laboratory duplicates summary forms.The raw data package will consist of the elements presented in the QC summary package but will additionally include the raw data.

  • The QA/QC parameters reviewed during the data validation process included: • Holding times • Blank contamination • Instrument calibration • Surrogate recovery • MS/MSD duplicate and laboratory duplicate analysis • Laboratory control sample analysis • Field duplicates analysis • Compound identification The overall precision, accuracy, representativeness, comparability and completeness parameters determined from the PCB and TOC data reviews were used as indicators of overall data quality.

  • The results were impressive: private investment as a share of GDP almost doubled in both countries, and for the period 1980-2002, China’s per capita GDP rose tenfold, while India’s quadrupled.

  • Laboratory control sample (LCS) must be prepared once per every 20 samples or per digestion batch, whichever is more frequent, and spiked with a solution prepared from a second source or lot number, other than the source used to verify the accuracy of the standard curve for the determinative analytical method.

  • The laboratory reports will be consistent with USEPA Level III documentation and include the following data and summary forms: Narrative, cross-reference, chain-of-custody, and method references; Analytical results;Surrogate recoveries (as applicable); Calibration summary;Blank results; Laboratory control sample recoveries; Duplicate sample results or duplicate spike recoveries; Sample spike recoveries;Instrument tuning summary; Associated raw data; and Magnetic tape or equivalent upon request.

  • Laboratory control sample recoveries will be reported by the laboratories; however, sample results will not be corrected for recovery using these values.

  • Laboratory control sample was spiked with 100–200 ng of Aro-clor 1242, 1248, 1254, 1260 on free-PCB matrix of each batch.


More Definitions of Laboratory control sample

Laboratory control sample. (LCS) means a blank matrix to which known concentrations of the target method analytes are added. The LCS is analyzed in the same manner as the representative sample.
Sample 1Sample 2Sample 3
Laboratory control sample means a sample of an inert matrix or a matrix with a consistent concentration of the analytes of interest, fortified with a verified known amount of the analytes of interest, generally used to assess the performance of all or part of a measurement system, or to establish intra-laboratory or analyst bias.
Sample 1
Laboratory control sample. (LCS) means a blank matrix to which known concentrations of each of the target method analytes are added. The
Sample 1
Laboratory control sample. (LCS) means a blank matrix to which known concentrations of each of the target method analytes are added. The spiked concentration must be within the calibration range of the method. The LCS must be carried through the entire sample preparation process and must be analyzed in the same manner as a representative sample. The LCS must be made from a standard that is not from the same vendor, or from the same lot if only one vendor is available, that is used for the calibration curve.must be at a mid-range concentration of the calibration curve for the target analytes. The LCS is analyzed in the same manner as the representative sample.
Sample 1

Related to Laboratory control sample

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