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Performance goals for internal quality control of multichannel haematology analysers
1Division of Laboratory Medicine, Mayo Clinic, Rochester, Minnesota 55905.
Abstract:
Performance goals for analytic bias and analytic imprecision are presented for multichannel haematology analysers. These goals represent a compromise between limits that would cause minimal degradation in the information content for clinical decisions and limits that are achievable by current instruments. For midrange measurements the maximal limits for total analytic bias are +/- 14.6% for WBC, +/- 5.3% for RBC, +/- 4.5% for Hb concentration, +/- 4.2% for MCV, and +/- 22% for platelet counts. The limits include error inherent in calibrator value assignment, instrument calibration, instrument drift, and instrument non-linearity as well as the quality control systems necessary to monitor each of these processes. If analytic biases are held within the proposed limits, the clinical specificities of the assays will be decreased by less than 7% for all assays except that platelet counts will have a decrease in specificity of about 15%. Analytic imprecision has minimal direct effect on clinical decisions because the influence of within-person and across-person biological variation dominates. However, analytic imprecision is a major factor in the control of analytic bias and thereby remains an important quality control factor.
Insights
New performance goals for hematology analyzers balance clinical decision-making needs with instrument capabilities. These targets for analytic bias and imprecision aim to maintain assay accuracy and reliability in clinical laboratories.
Area of Science:
- Clinical laboratory science
- Medical diagnostics
- Hematology
Background:
- Establishing performance standards for hematology analyzers is crucial for reliable clinical decision-making.
- Current analytical performance goals must balance clinical utility with achievable instrument capabilities.
Purpose of the Study:
- To define performance goals for analytic bias and imprecision in multichannel hematology analyzers.
- To ensure that analytical performance limits minimize degradation of clinical decision-making information while remaining achievable.
Main Methods:
- Defined maximal limits for total analytic bias for key hematology parameters (WBC, RBC, Hb, MCV, platelets) at midrange measurements.
- Included various error sources in limit calculations: calibrator assignment, instrument calibration, drift, non-linearity, and quality control.
Main Results:
- Proposed maximal total analytic bias limits: +/- 14.6% (WBC), +/- 5.3% (RBC), +/- 4.5% (Hb), +/- 4.2% (MCV), +/- 22% (platelets).
- Adherence to these limits is projected to decrease clinical specificities by <7% (except platelets, ~15%).
- Analytic imprecision has minimal direct clinical impact but is vital for controlling analytic bias.
Conclusions:
- The proposed performance goals offer a practical compromise for multichannel hematology analyzers.
- These goals are essential for maintaining the quality and reliability of hematological testing.
- Effective quality control systems are necessary to monitor and manage analytic bias and imprecision.
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