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510(k) Data Aggregation
(96 days)
The Access PCT assay is a paramagnetic, chemiluminescent immunoassay for in vitro quantitative determination of procalcitonin (PCT) levels in human serum and plasma (lithium heparin and EDTA) using the Access Immunoassay Systems. Measurement of PCT in conjunction with other laboratory findings and clinical assessments aids in the risk assessment of critically ill patients on their first day of ICU admission to severe sepsis and septic shock.
The Access PCT Calibrators are intended to calibrate the Access PCT assay for the quantitative determination of procalcitonin levels in human serum and plasma (lithium heparin and EDTA) using the Access Immunoassay Systems.
The Access PCT assay is a paramagnetic, chemiluminescent immunoassay for in vitro quantitative determination of procalcitonin (PCT) levels in human serum and plasma using the Access Immunoassay Systems. Measurement of PCT in conjunction with other laboratory findings and clinical assessments aids in the risk assessment of critically ill patients on their first day of ICU admission for progressive to severe sepsis and septic shock.
A description of the reagent pack is provided below.
- R1a: Dynabeads* paramagnetic particles coated with mouse anti-human ● Procalcitonin monoclonal antibody in a TRIS buffer with surfactant, protein (bovine), ≤ 0.1% sodium azide, and 0.1% ProClin**300
- R1b: 0.10 N Sodium Hvdroxide ●
- R1c: MOPS Buffer with surfactant and protein (bovine, murine). ≤ 0.1% . sodium azide, and 0.1% ProClin 300
- R1d: Rat anti-Procalcitonin recombinant alkaline phosphatase conjugate in a ● MOPS buffer with surfactant and protein (bovine, murine, recombinant), ≤ 0.1% sodium azide, and 0.1% ProClin 300
This document describes the acceptance criteria and study results for the Beckman Coulter Access PCT assay, which measures procalcitonin (PCT) levels in human serum and plasma to aid in the risk assessment of critically ill patients for severe sepsis and septic shock.
1. Table of Acceptance Criteria and Reported Device Performance
| Performance Characteristic | Acceptance Criteria | Reported Device Performance |
|---|---|---|
| Method Comparison | Slope = 0.90 ± 0.10 relative to predicate (VIDAS® B·R·A·H·M·S PCT®) | Slope = 0.96 (95% CI: 0.94 to 0.99) |
| Correlation Coefficient (r) ≥ 0.95 | r = 0.99 | |
| Imprecision | Total imprecision ≤ 8.0% CV at concentrations ≥ 0.150 ng/mL; SD ≤ 0.012 ng/mL at concentrations < 0.150 ng/mL | Met or exceeded criteria (Exact reported values not specified for all points, but stated to meet criteria). |
| Within-run imprecision ≤ 6.0% CV at concentrations ≥ 0.150 ng/mL; SD ≤ 0.009 ng/mL at concentrations < 0.150 ng/mL | Met or exceeded criteria (Exact reported values not specified for all points, but stated to meet criteria). | |
| High-dose Hook Effect | No hook effect up to a specified high concentration. | No hook effect up to 5,000 ng/mL. |
| Linearity | Linear across the assay range. | Demonstrated to be linear (0.05 ng/mL to approximately 100 ng/mL). |
| Dilution Recovery | Overall average recovery of 100 ± 10%; individual sample dose recovery within ± 15% when diluted 10-fold. | Demonstrated to dilute recover across the range (0.05 ng/mL to approximately 100 ng/mL) in serum, lithium heparin plasma, and EDTA plasma samples, for concentrations up to 1,000 ng/mL. Overall average recovery 100 ± 10%, individual sample dose recovery within ± 15%. |
| Limit of Blank (LoB) | ≤ 0.005 ng/mL | ≤ 0.005 ng/mL |
| Limit of Detection (LoD) | ≤ 0.01 ng/mL | ≤ 0.01 ng/mL |
| Limit of Quantitation (LoQ) | ≤ 0.02 ng/mL (based on 20% within-laboratory imprecision) | ≤ 0.02 ng/mL |
| Total Error (at clinical cutoffs) | ≤ 9.4% at 0.5 ng/mL and 2.0 ng/mL (Weighted Deming) / ≤ 11.3% at 0.5 ng/mL and 2.0 ng/mL (Passing Bablok) | At 0.5 ng/mL: Bias (%) 0.6%, CV (%) 4.5%, Total Error (%) 9.4% (Weighted Deming) / Bias (%) -0.6%, CV (%) 4.5%, Total Error (%) 9.4% (Passing Bablok) At 2.0 ng/mL: Bias (%) 0.7%, CV (%) 4.2%, Total Error (%) 8.9% (Weighted Deming) / Bias (%) -3.1%, CV (%) 4.2%, Total Error (%) 11.3% (Passing Bablok) |
| Analytical Specificity | Change in concentration between diluent control and test samples within ± 10% for potential cross-reactants. | No significant cross-reactivity for human calcitonin, human katacalcin, human alpha CGRP, and human beta CGRP (within ± 10% change). |
| Interfering Substances | Change in concentration between diluent control and test sample within ± 10% for potential interferents. | None of the tested substances were found to cause significant interference (within ± 10% change). |
| Expected Reference Intervals | Consistent with commonly used reference intervals (e.g., PCT ≤ 0.1 ng/mL for healthy individuals). | 95th percentile of 0.065 ng/mL with a 95% Confidence Interval (CI) of 0.054 - 0.085 ng/mL. |
| Matrix Comparison | Slopes and confidence intervals within acceptable ranges for comparison between serum (gel), serum (no gel), lithium heparin plasma, and EDTA plasma. | Serum (gel) vs. serum (no gel): Slope = 0.99 (95% CI: 0.98 to 1.00). Lithium heparin plasma vs. serum (no gel): Slope = 0.96 (95% CI: 0.95 to 0.97). EDTA plasma vs. serum (no gel): Slope = 1.03 (95% CI: 1.01 to 1.04). Lithium heparin plasma vs. serum gel: Slope = 0.97 (95% CI: 0.96 to 0.99). EDTA plasma vs. serum gel: Slope = 1.04 (95% CI: 1.03 to 1.05). EDTA plasma vs. lithium heparin plasma: Slope = 1.06 (95% CI: 1.05 to 1.08). |
| Carryover Study | Shift of ≤ 10% for assay carryover. | Individual estimates of carryover ranged from -6% to +8%, indicating no clear trend of positive or negative shifts, thus meeting criteria. |
2. Sample Size Used for the Test Set and Data Provenance
- Method Comparison: Approximately 207 serum samples. The provenance of these samples (country of origin, retrospective/prospective) is not explicitly stated in the provided text.
- Expected Reference Intervals: 202 apparently healthy individuals. These samples were "prospectively procured." The country of origin is not explicitly stated.
- Matrix Comparison: Forty-three (43) matched sets of serum gel, serum no gel, plasma lithium heparin, and plasma EDTA samples. The provenance of these samples is not explicitly stated.
- Analytical Specificity and Interfering Substances: Serum patient samples. The number of samples is not explicitly stated, nor is their provenance.
3. Number of Experts Used to Establish the Ground Truth for the Test Set and Qualifications of Those Experts
This device is an in vitro diagnostic (IVD) assay for measuring a biomarker (procalcitonin). The "ground truth" for such assays is typically established by reference methods or validated comparative assays, not by expert human graders. The studies compare the device's performance against either a legally marketed predicate device (VIDAS® B·R·A·H·M·S PCT®) or accepted analytical standards (e.g., CLSI guidelines). Therefore, no human experts were used to establish ground truth in the traditional sense of image or clinical interpretation.
4. Adjudication Method for the Test Set
Not applicable. As an IVD assay, the performance is assessed by comparing quantitative measurements against a predicate device or pre-defined analytical acceptance criteria, not through an adjudication process involving human experts.
5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance
Not applicable. This is an IVD assay, not an AI-assisted diagnostic tool that relies on human readers or interpretation of complex medical images/cases.
6. If a Standalone (i.e., algorithm only without human-in-the-loop performance) was done
Yes, the studies presented are all standalone performance assessments of the Access PCT assay. The device quantitatively determines PCT levels, and its performance characteristics (accuracy, precision, limits, specificity, interference) are evaluated intrinsically or by comparison to another diagnostic test, without a human-in-the-loop component for result generation.
7. The Type of Ground Truth Used (expert consensus, pathology, outcomes data, etc.)
The "ground truth" in these studies is based on:
- Reference Method/Comparative Device: For method comparison, the predicate device (VIDAS® B·R·A·H·M·S PCT®) serves as the comparator.
- Analytical Standards: For characteristics like linearity, imprecision, LoB, LoD, LoQ, analytical specificity, and interference, the "ground truth" is established by predefined analytical criteria, often guided by CLSI guidelines (e.g., EP17-A2 for LoQ, EP07 for interference).
- Clinically Relevant Concentrations: For some studies (e.g., analytical specificity, interference), specific PCT concentrations (e.g., 0.25 ng/mL, 0.5 ng/mL, 2.0 ng/mL) are used as reference points for evaluation.
8. The Sample Size for the Training Set
The document does not explicitly mention a "training set" in the context of machine learning or AI. This device is an immunoassay, not an AI algorithm that requires training data. The studies presented are primarily analytical performance verification and validation studies.
9. How the Ground Truth for the Training Set was Established
Not applicable, as this is an immunoassay and does not involve an AI training set in the conventional sense.
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