Nova Allegro HbA1c Assay, Nova Allegro Analyzer
Device Facts
| Record ID | K221326 |
|---|---|
| Device Name | Nova Allegro HbA1c Assay, Nova Allegro Analyzer |
| Applicant | Nova Biomedical Corporation |
| Product Code | LCP · Hematology |
| Decision Date | Nov 22, 2024 |
| Decision | SESE |
| Submission Type | Dual Track |
| Regulation | 21 CFR 864.7470 |
| Device Class | Class 2 |
| Attributes | Pediatric |
Indications for Use
The Nova Allegro HbA1c Assay is intended for in vitro diagnostic use on the Nova Allegro Analyzer for the quantitative determination of the glycated Hemoglobin A1c) in capillary whole blood obtained from the fingertip. The results from this assay are intended to be used for the monitoring of long-term blood glucose/metabolic control in individuals with diabetes mellitus. The Nova Allegro Analyzer is intended for in vitro diagnostic use in clinical laboratory and near-patient testing (point-of-care) settings for the quantitative determination of Nova Allegro Assays using Nova Allegro Test Cartridges.
Device Story
Nova Allegro HbA1c Assay is a fully automated, latex-enhanced turbidimetric immunoassay for quantitative determination of % HbA1c in capillary fingerstick whole blood. System comprises Nova Allegro Analyzer and single-use test cartridges containing integrated capillary collection device. Input: 1.5 µL capillary blood. Operation: blood sample and reagents mixed in cartridge; total glycated hemoglobin and total hemoglobin nonspecifically absorbed to latex particles; anti-human mouse HbA1c antibody forms complex; agglutination measured as absorbance. Analyzer calculates ratio of glycated to total hemoglobin; displays % HbA1c and estimated average glucose (eAG) based on NGSP formula. Used in clinical labs and point-of-care settings by healthcare professionals. Output: quantitative HbA1c result on analyzer screen/printout. Benefits: provides rapid, point-of-care monitoring of long-term glycemic control, facilitating clinical decision-making regarding diabetes management.
Clinical Evidence
Clinical performance evaluated at four physician office sites using 533 patient capillary fingerstick samples compared to matched venous whole blood samples on an FDA-cleared comparator method. Passing-Bablok regression analysis of 526 paired results showed a slope of 0.972, intercept of 0.217, and r=0.993, demonstrating strong correlation. Analytical studies included precision (reproducibility %CV 1.87-2.91%), linearity (4.0-14.0% range), and interference testing (no significant interference from common substances or hemoglobin variants except HbF).
Technological Characteristics
Latex-enhanced turbidimetric immunoassay. Reagents: lysis solution, polystyrene latex particles, mouse monoclonal antibody, goat polyclonal antibody. Analyzer: multi-assay, point-of-care, dual-bay, multi-wavelength optical system. Connectivity: integrated barcode reader and printer. Calibration: 2D barcode on cartridge with stored curve. Sterilization: not specified. Software: automated analysis, error flagging (e.g., 'HbA1c Bad Sample').
Indications for Use
Indicated for monitoring long-term blood glucose/metabolic control in individuals with diabetes mellitus. For use with capillary whole blood obtained from the fingertip in clinical laboratory and point-of-care settings.
Regulatory Classification
Identification
A glycosylated hemoglobin assay is a device used to measure the glycosylated hemoglobins (A1a , A1b , and A1c ) in a patient's blood by a column chromatographic procedure. Measurement of glycosylated hemoglobin is used to assess the level of control of a patient's diabetes and to determine the proper insulin dosage for a patient. Elevated levels of glycosylated hemoglobin indicate uncontrolled diabetes in a patient.
Predicate Devices
- Alere Afinion HbA1c on Afinion 2 analyzer (K171650)
Related Devices
- K142789 — A1c iGear System · Sakae Corporation · Dec 16, 2014
Submission Summary (Full Text)
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FDA
U.S. FOOD & DRUG
ADMINISTRATION
# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY
ASSAY AND INSTRUMENT
## I Background Information:
A 510(k) Number
K221326
B Applicant
Nova Biomedical Corporation
C Proprietary and Established Names
Nova Allegro HbA1c Assay, Nova Allegro Analyzer
D Regulatory Information
| Product Code(s) | Classification | Regulation Section | Panel |
| --- | --- | --- | --- |
| LCP | Class II | 21 CFR 864.7470 - Glycosylated Hemoglobin Assay | HE - Hematology |
| JQT | Class I | 21 CFR 862.2400 - Densitometer/scanner (integrating, reflectance, TLC, or radiochromatogram) for clinical use | CH - Clinical Chemistry |
## II Submission/Device Overview:
A Purpose for Submission:
This submission is a Dual 510(k) and CLIA Waiver by Application (Dual Submission) for a new device, tracked as K221326 and CW220003.
B Measurand:
Whole blood glycosylated hemoglobin (HbA1c)
Food and Drug Administration
10903 New Hampshire Avenue
Silver Spring, MD 20993-0002
www.fda.gov
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C Type of Test:
Quantitative, latex enhanced turbidimetric immunoassay
III Intended Use/Indications for Use:
A Intended Use(s):
See Indications for Use below.
B Indication(s) for Use:
The Nova Allegro HbA1c Assay is intended for in vitro diagnostic use on the Nova Allegro Analyzer for the quantitative determination of the glycated Hemoglobin (% hemoglobin A1c) in capillary whole blood obtained from the fingertip.
The results from this assay are intended to be used for the monitoring of long-term blood glucose/metabolic control in individuals with diabetes mellitus.
The Nova Allegro Analyzer is intended for in vitro diagnostic use in clinical laboratory and near-patient testing (point-of-care) settings for the quantitative determination of Nova Allegro Assays using Nova Allegro Test Cartridges.
C Special Conditions for Use Statement(s):
Rx - For Prescription Use Only
- This HbA1c test should not be used for analyzing samples from patients with conditions causing shortened red blood cell survival, such as hemolytic diseases, pregnancy and significant acute or chronic blood loss.
- This HbA1c test should not be used in monitoring daily glucose control and should not be used to replace daily home testing of urine and blood glucose levels.
- This HbA1c test is not intended for use in the diagnosis of or screening for diabetes.
- This HbA1c test is not intended for use on neonates.
- This device has significant negative interference with fetal hemoglobin (HbF). HbA1c results are invalid for patients with abnormal amounts of HbF, including those with known Hereditary Persistence of Fetal Hemoglobin.
D Special Instrument Requirements:
The Nova Allegro HbA1c Assay is used with the Nova Allegro Analyzer.
IV Device/System Characteristics:
A Device Description:
The Nova Allegro HbA1c Assay is a fully automated assay for the determination of the percentage of HbA1c in capillary fingerstick whole blood and the calculation of estimated average glucose (eAG). The Allegro HbA1c Test Cartridge contains all reagents required for the determination of % HbA1c and includes an integrated capillary sample collection device.
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The sample material is collected with the capillary sample device and the capillary device is inserted back into the test cartridge before the test cartridge is inserted into the Allegro Analyzer. The Test Cartridge has a barcode label with lot specific information.
Estimated Average Glucose is the average glucose levels for the past 60 to 90 days calculated using the following NGSP recommended formula: eAG (mg/dl) = 28.7 × A1C - 46.7.
¹ Harmonizing Hemoglobin A1c Testing, https://ngsp.org/A1ceAG.asp
The Allegro HbA1c Test Cartridge contains the following:
- Reagent 1 - Lysis solution containing a small concentration of detergent and Azide in water
- Reagent 2 - Polystyrene latex particles in water
- Reagent 3 - Mouse monoclonal antibody in a buffered solution containing salts and Bovine Serum Albumin (BSA)
- Reagent 4 - Goat polyclonal antibody in a buffered solution containing salts and Bovine Albumin (BSA)
The Nova Allegro Analyzer is a compact multi-assay analyzer for point-of-care testing, designed to work with Nova Allegro Test Cartridges. The analyzer supports multiple wavelengths that are used to measure the assay of interest. The analyzer contains two analytical bays where the single-use test cartridges are analyzed. Only the right cartridge bay of the Allegro Analyzer can be used with Allegro HbA1c Test Cartridges. When the HbA1c test cartridge bar code is scanned for analysis, the right bay of the analyzer will open. To support the HbA1c Assay, the instrument has a control feature to ensure for the correct sample type and sample volume.
## B Principle of Operation:
The Nova Allegro HbA1c test cartridge measures the total glycated hemoglobin and the total hemoglobin concentration. The ratio between them is proportional to the % HbA1c of the sample. The analyzer calculates the ratio. A whole blood sample containing hemoglobin A1c and total hemoglobin are nonspecifically absorbed to latex particles. The anti-human mouse HbA1c antibody reacts to form a complex. Agglutination occurs when polyclonal antibody specifically reacts with the mouse antibody bound to the hemoglobin A1c on the surface of the latex particles. The amount of agglutination is measured as absorbance. The HbA1c value is obtained from a stored calibration curve and displayed on the Nova Allegro Analyzer.
## C Instrument Description Information:
1. Instrument Name:
Nova Allegro Analyzer
2. Specimen Identification:
Specimen identification can be done by scanning a patient identification bar code or by manual entry.
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3. Specimen Sampling and Handling:
A single-use, disposable capillary sample collection device, which is part of the HbA1c Assay Test Cartridge, is used to obtain 1.5 µL fingerstick capillary whole blood to the test cartridge. The capillary sample collection device containing the blood is inserted into the HbA1c test cartridge, then the test cartridge is placed into the sample bay within 1 minute of sample collection and the start icon is pressed to start analysis.
4. Calibration:
The reagent test cartridge includes a scannable 2D barcode containing the stored calibration curve. The HbA1c value is obtained using the stored calibration curve and is displayed on the Nova Allegro Analyzer.
5. Quality Control:
External Quality Control (QC) material is used to monitor the performance of the analyzer and the test cartridges used with the analyzer and to verify the analyzer is performing to specifications. QC recommendations are found in the labeling.
V Substantial Equivalence Information:
A Predicate Device Name(s):
Alere Afinion HbA1c on Afinion 2 analyzer
B Predicate 510(k) Number(s):
K171650
C Comparison with Predicate(s):
| Device & Predicate Device(s): | K221326 | K171650 |
| --- | --- | --- |
| Device Trade Name | Nova Allegro HbA1c Assay | Afinion HbA1c |
| General Device Characteristic Similarities | | |
| Intended Use/Indications For Use | For quantitative determination of glycated hemoglobin (% hemoglobin A1c, % HbA1c). | Same |
| General Device Characteristic Differences | | |
| Test Principle | Latex enhanced turbidimetric immunoassay | Automated boronate affinity assay |
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| Device & Predicate Device(s): | K221326 | K171650 |
| --- | --- | --- |
| Device Trade Name | Nova Allegro Analyzer | Afinion 2 analyzer |
| General Device Characteristic Similarities | | |
| Intended Use/Indications For Use | For in vitro diagnostic use for the quantitative determination of assays using test cartridges. | Same |
| General Device Characteristic Differences | | |
| Cartridge Interface | Physical processing of cartridge (locking, docking, foil penetration, mixing assay) | Physical processing of cartridge (locking, docking, splitting, foil penetration, merging) |
| Peripheral units | Barcode reader and printer integrated into analyzer | A barcode reader and printer can be connected |
VI Standards/Guidance Documents Referenced:
None referenced
VII Performance Characteristics (if/when applicable):
A Analytical Performance:
1. Precision/Reproducibility:
Precision studies were performed for the Nova Allegro HbA1c Assay by operators who are representative of intended CLIA waived users at four point of care (POC) sites representative of CLIA waived settings using a total of eight Nova Biomedical Allegro Analyzers (2 per site) and three lots of Allegro HbA1c Test Cartridges.
20-Day Imprecision (Controls)
Two Nova Allegro HbA1c Control Solutions were analyzed for twenty days in duplicate twice a day (total of eighty measurements per sample) at each of the four POC CLIA waived sites, using three HbA1c test cartridge lots and three different operators who are representative of intended CLIA waived users at each site. Analyses were performed for each individual site and for all sites combined and are presented below:
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| | | Repeatability | | Between-Run/Operator | | Between-Day/Lot | | Between-Site | | Reproducibility | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | Mean | SD | %CV | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| Control 1 | 5.67 | 0.091 | 1.61% | 0.037 | 0.65% | 0.034 | 0.60% | 0.045 | 0.79% | 0.113 | 2.00% |
| Control 2 | 9.47 | 0.175 | 1.85% | 0.035 | 0.37% | 0.118 | 1.25% | 0.112 | 1.18% | 0.242 | 2.55% |
# 5-Day Imprecision (Venous Whole Blood)
The sponsor provided a precision study using venous whole blood, a validated surrogate for the intended use sample. The sponsor additionally provided data to support that venous blood samples did not behave differently from capillary whole blood samples. Three K2EDTA venous whole blood samples were analyzed for five days in duplicate four times a day (total of forty measurements per sample) at four sites, using three different HbA1c test cartridge lots and three different operators at each site. Each site used its own venous whole blood samples; therefore, only individual site analysis was performed for the blood samples and are shown below:
| Venous Whole Blood Samples | Mean | Repeatability | | Between-Run/Operator | | Between-Day | | Between-Lot | | Within-Laboratory | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | SD | %CV | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| Blood 1 | 6.68 | 0.110 | 1.65% | 0.045 | 0.68% | 0.041 | 0.61% | 0.049 | 0.73% | 0.126 | 1.89% |
| Blood 2 | 7.99 | 0.093 | 1.16% | 0.077 | 0.96% | 0.029 | 0.36% | 0.032 | 0.40% | 0.124 | 1.55% |
| Blood 3 | 12.25 | 0.273 | 2.23% | 0.142 | 1.16% | 0.125 | 1.02% | 0.129 | 1.05% | 0.332 | 2.71% |
# Repeatability (Capillary Fingerstick Blood)
For evaluation of fingerstick precision/repeatability, a second fingerstick specimen was collected and measured for HbA1c on 524 subjects enrolled in the Method Comparison study. Three lots of HbA1c test cartridges, eight analyzers (two at each of four sites) and three different operators who are representative of intended CLIA waived users conducted the fingerstick precision measurements. Estimates of repeatability are shown below.
| | | | Repeatability | |
| --- | --- | --- | --- | --- |
| HbA1C range | N | Mean | SD | %CV |
| 4.0 - 6.0 | 200 | 5.50 | 0.083 | 1.50% |
| 6.1 – 8.0 | 169 | 6.83 | 0.103 | 1.51% |
| 8.1 – 10.0 | 106 | 8.94 | 0.171 | 1.92% |
| 10.1 – 14.0 | 49 | 11.32 | 0.270 | 2.38% |
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Reproducibility (Total Imprecision) Estimate
Total imprecision including repeatability, between-run/operator, between day/lot and between-site is shown below.
| HbA1c range | FS Repeatability | VWB Between-Run/Operator | VWB Between-Day/Lot | QC Between-Site | Reproducibility | |
| --- | --- | --- | --- | --- | --- | --- |
| | SD | SD | SD | SD | SD | %CV |
| 4.0 - 6.0 | 0.083 | 0.045 | 0.049 | 0.045 | 0.115 | 2.31% |
| 6.1 -8.0 | 0.103 | 0.045 | 0.049 | 0.045 | 0.131 | 1.87% |
| 8.1 - 10.0 | 0.171 | 0.077 | 0.032 | 0.112 | 0.221 | 2.45% |
| 10.1 -14.0 | 0.270 | 0.142 | 0.129 | 0.112 | 0.349 | 2.91% |
FS -fingerstick; VWB- venous whole blood
2. Linearity:
A study was performed using 11 whole blood samples with HbA1c concentrations spanning 4.0% to 15.4%. The 11 samples were created by mixing varying aliquots of a low and a high concentration sample. Each sample was assayed in replicates of four on one Nova Allegro Analyzer using one lot of Allegro HbA1c Test Cartridges and the mean of replicates was compared to results obtained on the Tosoh G8 analyzer. The results from linear regression results are shown below:
| Analyte | Range Tested (%) | Levels | Slope | Intercept | r |
| --- | --- | --- | --- | --- | --- |
| HbA1c | 4.0 - 15.4 | 11 | 1.016 | -0.14 | 0.999 |
All deviations from linearity were within ±5%. The results of the linearity study support the sponsor's claim that the Nova Allegro HbA1c Assay on the Nova Allegro Analyzer is linear across the measuring range of 4.0 -14.0% HbA1c. If a test result is outside the Allegro's measuring range, the analyzer will not display a HbA1c result. The analyzer screen shows a red bar graph flag and <4.0% or >14.0% are displayed. The analyzer printout shows 3 down arrows or 3 up arrows and <4.0% or >14.0% are displayed on the printout. This function was validated and demonstrated to function as intended.
3. Analytical Specificity/Interference:
Studies were performed to evaluate the impact of common endogenous and exogenous substances in the intended use population on Nova Allegro HbA1c Assay results. Whole blood samples containing HbA1c at two levels (5.4 - 6.6% HbA1c and 8.6 - 10.3% HbA1c) were split into test samples containing potential interfering substances and control specimens without the interfering substance. Test samples were assayed in replicates of 10 and the mean concentration for each test sample was compared to the mean concentration of 10 replicates of the control sample. Two Nova Allegro Analyzers and one lot of Nova Allegro HbA1c Test Cartridges were used. The highest tested concentrations at which no significant interference was observed (defined by the sponsor as less than ±10% difference between the test and control samples) are presented in the following table:
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| Substances | Highest concentration tested without significant interference |
| --- | --- |
| Acetylsalicylic Acid | 65.2 mg/dL |
| Ibuprofen | 50.0 mg/dL |
| Glyburide | 200 mg/dL |
| Cholesterol | 1055 mg/dL |
| Acetaminophen | 20.0 mg/dL |
| Non-conjugated Bilirubin | 60.0 mg/dL |
| Conjugated Bilirubin | 30.0 mg/dL |
| Ascorbic Acid | 6.0 mg/dL |
| Metformin | 4.0 mg/dL |
| Glucose | 1000 mg/dL |
| Glipizide | 0.2 mg/dL |
| Chlorpropamide | 74.8 mg/dL |
| Tolbutamide | 64 mg/dL |
| Acarbose | 60 mg/dL |
| Captopril | 0.6 mg/dL |
| Rheumatoid Factor | 572 IU/ml |
| Ampicillin | 100 mg/dL |
| Cyclosporine | 0.5 mg/dL |
| Heparin | 5 U/mL |
| Levodopa | 2 mg/dL |
| Metronidazole | 20 mg/dL |
| Phenylbutazone | 40 mg/dL |
| Rifampicin | 6.4 mg/dL |
| Theophylline | 10 mg/dL |
| Vitamin B12 | 1.2 mg/dL |
| Furosemide | 7 mg/dL |
| Gemfibrozil | 8 mg/dL |
| Losartan | 6 mg/dL |
| Nicotinic Acid | 70 mg/dL |
| Urea | 700 mg/dL |
| y-Tocopherol | 10 mg/dL |
| Atorvastatin | 5 mg/dL |
| Intralipid | 1000 mg/dL |
| Propranolol | 0.3 mg/dL |
| Uric Acid | 30.0 mg/dL |
| Acetylcysteine | 166 mg/dL |
| Cefoxitin | 650 mg/dL |
| Doxycyclin | 5 mg/dL |
| Immunoglobulin | 2 g/dL |
| Methyldopa | 2.25 mg/dL |
| Ozempic (Semaglutide) | 0.192 mg/dL |
| Protein (Total) | 21000 mg/dL |
| Salicylic acid | 59 mg/dL |
| Triglycerides | 1520 mg/dL |
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# Hemoglobin Interference
A study was performed to test the impact of hemoglobin on the Nova Allegro HbA1c Assay using six (6) Allegro Analyzers and one (1) lot of reagents. Fifteen venous whole blood specimens with HbA1c concentrations from 5.0 to 11.0% and hemoglobin concentrations from 10.8 to 14.6 g/dL were prepared to contain hemoglobin at target levels of 5.5 and 20.5 g/dL. The average of three (3) replicates of each blood sample was compared to the average neat HbA1c sample result. The results demonstrated that no significant interference (defined by the sponsor as less than ±10% interference between the test and control samples) was observed from total hemoglobin levels between 6 and 20 g/dL. The Allegro Analyzer will not generate HbA1c results with samples containing hemoglobin concentrations outside of 6.0 - 20.0 mg/dL and will display the error code "HbA1c Bad Sample". This feature was validated and was shown to function as intended.
# Cross-Reactivity
Potential cross reactivity from HbA0, HbA1a and HbA1b was evaluated using 226 samples with HbA1c concentrations ranging from 4.9-12.2% and containing HbA0 (83.8-93.5%), HbA1a (0.3-1.6%), HbA1b (0.4-1.7%). Samples were tested using the Allegro Analyzer and results compared to measurements obtained on the Tosoh G8 analyzer. Results are summarized below.
| Potential Interferent | Highest Level Tested with No Significant Interference |
| --- | --- |
| HbA0 | Up to 93.5% |
| HbA1a | Up to 1.6% |
| HbA1b | Up to 1.7% |
# Hemoglobin Derivatives
Potential interference from hemoglobin derivatives with the Nova Allegro HbA1c Assay was evaluated. Two Nova Allegro Analyzers and one lot of Nova Allegro HbA1c Test Cartridges were used to assess venous whole blood specimens at target levels of 5.5 and 8.0% HbA1c. Each blood sample was divided into a control sample and a test sample, and each was assessed in replicates of 10. Glycated albumin samples were derived with glycated human albumin. Acetylated hemoglobin was derived in the presence of acetylsalicyclic acid, carbamylated hemoglobin was derived in the presence of sodium cyanate, and labile A1c was derived in the presence of glucose. The sponsor defined no-significant interference as ≤±10% difference between the test and control samples and concluded that the following do not interfere with the Nova Allegro HbA1c assay: 50 mg/mL glycated albumin, 50 mg/mL acetylated hemoglobin, 0.5 mg/mL carbamylated hemoglobin, 20 mg/mL labile hemoglobin.
# Hemoglobin variant interference
A study was performed to assess potential interference from hemoglobin variants (HbA2, HbC, HbD, HbE, HbS, and HbF) on the Nova HbA1c Assay using two Nova Allegro Analyzers and one lot of Nova Allegro HbA1c Test Cartridges. One hundred and nineteen
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(119) venous whole blood samples were measured in this study, 20 samples for each HbC, HbD, HbE and HbF, 25 samples for HbS, and 14 samples for HbA2. Samples were measured on the Nova Allegro Analyzer and compared to results obtained by an FDA cleared comparator method that has been demonstrated to be free from the hemoglobin variant interference. The following tables summarize the samples and study results:
| Hemoglobin Variant | Number of Samples Tested | % Content of Variant in Sample | Range in Concentration in % HbA1c |
| --- | --- | --- | --- |
| HbC | 20 | 26.3 to 38.2 | 5.7 to 11.5 |
| HbE | 20 | 20.1 to 27.9 | 4.9 to 9.9 |
| HbD | 20 | 25.9 to 41.1 | 5.5 to 13.4 |
| HbA2 | 14 | 4.4 to 6.5 | 5.1 to 9.8 |
| HbS | 25 | 27.2 to 38.6 | 5.0 to 12.3 |
| HbF | 20 | 3.5 to 54.5 | 4.7 to 8.3 |
| Hemoglobin Variant | Mean % Bias | Range of relative bias |
| --- | --- | --- |
| HbC | 1.9% | -6.3% to 10% |
| HbE | 4.4% | -4.3% to 8.3% |
| HbD | 3.0% | -4.7% to 9.5% |
| HbA2 | 0.6% | -6.8% to 7.1% |
| HbS | -4.5% | -9.62% to 6% |
| HbF | 5.4% HbF is the highest HbF concentration where no significant interference (≤10%) is observed | |
The results from the Nova Allegro HbA1c Assay show that there is no significant interference for samples containing Hemoglobin C (≤38.2%), Hemoglobin D (≤41.1%), Hemoglobin E (≤27.9%), Hemoglobin S (≤38.6%), and Hemoglobin A2 (≤6.5%).
The following warning is included in the Nova Allegro HbA1c Assay package insert:
This device has significant negative interference with Fetal Hemoglobin (HbF). HbA1c results are invalid for patients with abnormal amounts of HbF, including those with known Hereditary Persistence of Fetal Hemoglobin.
4. Assay Reportable Range:
The claimed measuring range is 4 -14% HbA1c.
5. Traceability, Stability, Expected Values (Controls, Calibrators, or Methods):
Traceability:
The Allegro HbA1c assay on the Allegro Analyzer is traceable to the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) Reference Method for Measurement of HbA1c. The system is certified with the National Glycohemoglobin
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Standardization Program (NGSP). The certification expires in one year. See the NGSP website for current certification at http://www.ngsp.org.
6. Detection Limit:
The claimed measuring range of 4-14% HbA1c is based on linearity, accuracy and precision.
7. Assay Cut-Off:
Not applicable.
8. Accuracy (Instrument):
See Section VII.C.3. Other Clinical Supportive Data.
9. Carry-Over:
The Nova Allegro HbA1c Test Cartridges are fully self-contained test cartridges. The sponsor describes that no contact is made between the system instrumentation and the reagents or test sample.
B Comparison Studies:
1. Method Comparison with Predicate Device:
See Section VII.C.3. Other Clinical Supportive Data.
2. Matrix Comparison:
The Nova Allegro HbA1c Assay on the Nova Allegro Analyzer is for use only with capillary whole blood obtained from the fingertip.
C Clinical Studies:
1. Clinical Sensitivity:
Not applicable.
2. Clinical Specificity:
Not applicable.
3. Other Clinical Supportive Data (When 1. and 2. Are Not Applicable):
The performance of the Nova Allegro HbA1c Assay on the Nova Allegro Analyzer was assessed in the hands of 15 operators who were representative of intended CLIA waived users, at four clinical sites (physician offices). HbA1c results obtained from capillary fingerstick samples from 533 patients were compared to HbA1c results obtained from
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matched K2EDTA venous whole blood samples on an FDA cleared comparator method run at a NGSP secondary reference laboratory. A total of eight Allegro Analyzers (2 per site) and three lots of Allegro HbA1c Test Cartridges were used in the study. A Passing-Bablok regression analysis was performed using 526 paired results. Seven results were out of the analytical measuring range and were excluded from the regression analysis. The Passing-Bablok regression results are shown below:
| Site | N | Sample Range Allegro (%) | Slope | Intercept | r |
| --- | --- | --- | --- | --- | --- |
| 1 | 156 | 4.7 - 12.9 | 0.968 | 0.261 | 0.993 |
| 2 | 154 | 4.6 - 13.2 | 0.974 | 0.204 | 0.993 |
| 3 | 102 | 5.0 - 13.1 | 0.983 | 0.180 | 0.994 |
| 4 | 114 | 4.4 - 13.8 | 0.968 | 0.203 | 0.994 |
| Combined | 526 | 4.4 - 13.8 | 0.972 | 0.217 | 0.993 |
# D Clinical Cut-Off:
Not applicable.
# E Expected Values/Reference Range:
The labeling states the following.
In 2023, the American Diabetes Association (ADA) recommended a reasonable A1c goal for many non-pregnant adults is $< 7\%$ (53 mmol/mol) without significant hypoglycemia. On the basis of health care professional judgment and patient preference, achievement of lower A1c levels than the goal of $7\%$ may be acceptable and even beneficial if it can be achieved safely without significant hypoglycemia or other adverse effects of treatment. Less stringent A1c goals (such as $< 8\%$ [64 mmol/mol]) may be appropriate for patients with limited life expectancy or where the harms of treatment are greater than the benefits. Health care professionals should consider deintensification of therapy if appropriate to reduce the risk of hypoglycemia in patients with inappropriate stringent A1c targets. $^{1}$
$^{1}$ American Diabetes Association, Glycemic Targets: Standards of Care in Diabetes-2023, Diabetes Care 2023;46 (Suppl. 1): S97-S110.
# F Other Supportive Instrument Performance Characteristics Data:
Electrical safety and electromagnetic compatibility (EMC) testing had been performed and the system was found to be compliant.
Software and cybersecurity documentation was reviewed and found to be acceptable.
The Nova Allegro HbA1c Assay on the Nova Allegro Analyzer is not impacted by altitudes up to 12,000 feet/3650 meters.
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VIII Proposed Labeling:
The labeling supports the finding of substantial equivalence for this device.
IX Conclusion:
The submitted information in this premarket notification is complete and supports a substantial equivalence decision.
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