Quality Control Sample

Quality control (QC) samples serve a fundamentally distinct function from calibration standards: independently prepared at known concentrations, they are run alongside each analytical batch to provide real-time assessment of method accuracy and precision, serving as the primary criterion for identifying systematic error and determining batch acceptance. QC samples are indispensable quality management tools in GLP-compliant pharmacokinetic studies, GMP drug release testing, ISO/IEC 17025-accredited routine laboratory operations, and data quality assurance in official surveillance programs.

Application areas span drug analysis and pharmacokinetics across biological matrices (plasma, whole blood, urine), clinical mass spectrometry (endocrine hormones, vitamins, metabolites, therapeutic drug monitoring), environmental sample analysis (water, soil, sediment), food safety testing (pesticide residues, mycotoxins, food additives), and veterinary and pesticide multi-residue monitoring. Products are typically supplied at low (LQC), medium (MQC), and high (HQC) concentration levels, with LLOQ-level QC samples also available for select analytes to support complete concentration coverage in method validation.

CATO Research Chemicals Inc. offers over 18,100 QC samples across these application domains. Each product is supplied with a full assigned-value report, with concentrations independently verified by analysis and consistent batch-to-batch reproducibility. Produced under the company's dual ISO 17034-accredited quality system, all products carry clear metrological traceability and are suitable for direct use in accredited laboratory quality documentation. The majority are available from stock for rapid dispatch, with custom QC sample preparation available by specified matrix, concentration, and fill volume.