Diazyme DZ-Lite iFlash Total beta-hCG Assay, Diazyme DZ-Lite iFlash 1800 Chemiluminescence Immunoassay Analyzer

K212221 · Diazyme Laboratories, Inc. · DHA · Dec 13, 2021 · Clinical Chemistry

Device Facts

• Record ID: K212221
• Device Name: Diazyme DZ-Lite iFlash Total beta-hCG Assay, Diazyme DZ-Lite iFlash 1800 Chemiluminescence Immunoassay Analyzer
• Applicant: Diazyme Laboratories, Inc.
• Product Code: DHA · Clinical Chemistry
• Decision Date: Dec 13, 2021
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 862.1155
• Device Class: Class 2

Indications for Use

Diazyme DZ-Lite iFlash Total βhCG Assay is a chemiluminescent immunoassay intended for use for the quantitative determination of total beta-human chorionic gonadotropin (total βhCG) in human serum on DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer. The assay is intended for use as an aid in the early detection of pregnancy. Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer is used clinically in combination with the supporting chemiluminescence immunoassay reagents for determination of analytes in human body fluids through acridinium ester-based chemiluminescence method.

Device Story

The Diazyme DZ-Lite iFlash Total βhCG Assay is a sandwich chemiluminescent immunoassay performed on the Diazyme DZ-Lite iFlash 1800 Chemiluminescence Immunoassay Analyzer. The system uses anti-HCG coated paramagnetic microparticles and anti-HCG acridinium-ester-labeled conjugate to form a sandwich complex with HCG in human serum. After magnetic separation and washing, trigger solutions are added to initiate a chemiluminescent reaction. The resulting relative light units (RLUs) are measured by the analyzer's optical system. The analyzer is a microcomputer-controlled, random-access instrument that automates sample identification via barcode, aspiration, incubation, and detection. Results are calculated using a 3-point calibration curve and a master curve provided via reagent QR code. The device is intended for clinical laboratory use to aid in pregnancy detection. It provides quantitative results that assist healthcare providers in confirming pregnancy status.

Clinical Evidence

Bench testing only. Analytical performance validated per CLSI guidelines (EP05-A3, EP06-A, EP07-A2, EP17-A2, EP28-A3c). Precision studies (N=240 per analyzer) showed total CV% ranging from 2.3% to 12.1%. Linearity confirmed across 0.6–10,000 mIU/mL. LoQ determined at 0.60 mIU/mL. Method comparison with predicate (N=141) yielded a slope of 0.9976 and R² of 0.9936. No high-dose hook effect up to 1,000,000 mIU/mL. No significant interference from common endogenous substances.

Technological Characteristics

Sandwich immunoassay using paramagnetic microparticles and acridinium-ester-labeled conjugate. Chemiluminescent detection system. Microcomputer-controlled, random-access analyzer. Connectivity via barcode reader for sample identification. Reagents include ProClin 300 preservative. Traceable to WHO 5th International Standard 07/364. Software-controlled automated processing.

Indications for Use

Indicated for the quantitative determination of total βhCG in human serum to aid in the early detection of pregnancy.

Regulatory Classification

Identification

A human chorionic gonadotropin (HCG) test system is a device intended for the early detection of pregnancy is intended to measure HCG, a placental hormone, in plasma or urine. A human chorionic goadotropin (HCG) test system is a device intended for any uses other than early detection of pregnancy (such as an aid in the diagnosis, prognosis, and management of treatment of persons with certain tumors or carcinomas) is intended to measure HCG, a placental hormone, in plasma or urine.

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

K212221

B Applicant

Diazyme Laboratories Inc.

C Proprietary and Established Names

Diazyme DZ-Lite iFlash Total beta-hCG Assay, Diazyme DZ-Lite iFlash 1800 Chemiluminescence Immunoassay Analyzer

D Regulatory Information

| Product Code(s) | Classification | Regulation Section | Panel |
| --- | --- | --- | --- |
| DHA | Class II | 21 CFR 862.1155 - Human Chorionic Gonadotropin (Hcg) Test System | CH - Clinical Chemistry |
| JJE | Class I | 21 CFR 862.2160 - Discrete photometric chemistry analyzer for clinical use | CH - Clinical Chemistry |

## II Submission/Device Overview:

A Purpose for Submission:

New Device

B Measurand:

Total beta human chorionic gonadotropin (βhCG) in human serum

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 chemiluminescent immunoassay

III Intended Use/Indications for Use:

A Intended Use(s):

See Indications for Use below.

B Indication(s) for Use:

Diazyme DZ-Lite iFlash Total $\beta$ hCG Assay is a chemiluminescent immunoassay intended for use for the quantitative determination of total beta-human chorionic gonadotropin (total $\beta$ hCG) in human serum on DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer. The assay is intended for use as an aid in the early detection of pregnancy.

Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer is used clinically in combination with the supporting chemiluminescence immunoassay reagents for determination of analytes in human body fluids through acridinium ester-based chemiluminescence method.

C Special Conditions for Use Statement(s):

Rx - For Prescription Use Only

D Special Instrument Requirements:

Diazyme DZ-Lite iFlash 1800 Chemiluminescence Immunoassay Analyzer

IV Device/System Characteristics:

A Device Description:

The Diazyme DZ-Lite iFlash Total $\beta$ hCG Assay is sandwich immunoassay. The materials included are as follows:

Reagent kit, 100 tests, 2 packs, 50 tests/pack, Catalog # C86012

| R1 (2 x 3.5 mL) | Anti-HCG coated microparticles, 0.05% ProClin 300. |
| --- | --- |
| R2 (2 x 4.0 mL) | Anti-HCG acridinium-ester-labeled conjugate; 0.05% ProClin 300. |
| CAL1 (1 x 1.0 mL) | Calibrator 1, 1 bottle, phosphate buffer with protein stabilizers, 0.05% ProClin 300, lyophilized. |
| CAL2 (1 x 1.0 mL) | Calibrator 2, 1 bottle, HCG in phosphate buffer with protein stabilizers, 0.05% ProClin 300, lyophilized. |
| CAL3 (1 x 1.0 mL) | Calibrator 3, 1 bottle, HCG in phosphate buffer with protein stabilizers, 0.05% ProClin 300, lyophilized. |

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The reagents in the pack are ready for use. Calibrators are lyophilized powder that are reconstituted with distilled water before use.

The Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer is a microcomputer controlled, random and continuous access analyzer that performs immunoassays utilizing a magnetic particle solid phase and chemiluminescent detection.

## B Principle of Operation:

The HCG in the sample is incubated with anti-HCG coated paramagnetic microparticles and anti-HCG acridinium-ester-labeled conjugate react to form a sandwich complex. The unbound materials are washed away from the solid phase in a magnetic field. Afterwards, the Pre-Trigger and Trigger Solutions are added to the reaction mixture and the resulting chemiluminescent reaction is measured as relative light units (RLUs). A direct relationship exists between the amount of HCG in the sample and the RLUs detected by the iFlash optical system. Results are determined via a calibration curve, which is instrument-specifically generated by 3-point calibration and a master curve provided via the reagent QR code.

The Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer operates based on chemiluminescence using magnetic particle solid phase and chemiluminescent tracer.

## C Instrument Description Information:

1. Instrument Name:

Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer

2. Specimen Identification:

Human serum specimens are identified using the built-in barcode reader.

3. Specimen Sampling and Handling:

The sample supply system is composed of sample loading area, sample supply unit, and sample bar code scanner. Samples are loaded in the loading area and transferred by the sample supply unit. The bar code scanner reads the information on the bar code of the sample rack and sample tube.

The sample handling system consists of the sample/reagent probe assembly and wash well assembly. The sample/reagent probe assembly, located near the sample supply unit, aspirates and dispenses samples and reagents. Under the sample/reagent probe is a wash well for washing the probe in order to prevent carryover and reagent contamination.

4. Calibration:

Calibration and QC are usually performed at the beginning of routine tests (before sample processing). However they can be performed anytime during routine operation. The calibration and QC include the following two steps:

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- Test calibrators and controls
- Validate the result

Calibrators are prepared according to the reagent kit instructions.

5. Quality Control:

Quality control can be performed using Diazyme DZ-Lite hCG controls.

V Substantial Equivalence Information:

A Predicate Device Name(s):
Elecsys HCG and Beta Test System, Roche cobas c6000 Series system with electrochemiluminescence (ECL) module e601

B Predicate 510(k) Number(s):
K003178, K060373

C Comparison with Predicate(s):

Assay Predicate

| Device & Predicate Device(s): | K212221 | K003178 |
| --- | --- | --- |
| Device Trade Name | Diazyme DZ-Lite iFlash Total βhCG Assay | Roche Elecsys HCG and Beta Test System |
| General Device Characteristic Similarities | | |
| Intended Use/Indications For Use | For the quantitative determination of total beta-human chorionic gonadotropin (total βhCG) in human serum to aid in the early detection of pregnancy | Same |
| Type of Test | Quantitative | Same |
| Technology | Sandwich Immunoassay | Same |
| Method | Automated | Same |
| Calibration | Utilizes a stored calibration curve | Same |
| General Device Characteristic Differences | | |
| Specimen Type | Human Serum | Human Serum and Plasma |
| Assay Range | 0.6 – 10,000 mIU/mL | 0.1 – 10,000 mIU/mL |

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| Device & Predicate Device(s): | K212221 | K003178 |
| --- | --- | --- |
| Calibrator | Three-level Calibrators | Five-level Calibrators |

Instrument Predicate

| Device & Predicate Device(s): | K212221 | K060373 |
| --- | --- | --- |
| Device Trade Name | Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer | Roche cobas c6000 Series system with electrochemiluminescence (ECL) module e601 |
| General Device Characteristic Similarities | | |
| Intended Use/Indications For Use | Immunoassay Analyzer used clinically in combination with the supporting immunoassay reagents for determination of analytes in human body fluids | Same |
| Device Description | Microcomputer controlled, random and continuous access analyzer that performs immunoassays utilizing a magnetic particle solid phase and chemiluminescent detection | Same |
| Sample Aspiration | Directly from sample tube in the sample bay of the analyzer | Same |
| Sample Identification | Bar-coded sample tubes read directly by analyzer bar code reader | Same |
| General Device Characteristic Differences | | |
| Detection System | Chemiluminescent | Electrochemiluminescent |
| Throughput | 180 tests/hour | 170 tests/hour |

VI Standards/Guidance Documents Referenced:

- Clinical and Laboratory Standards Institute EP05-A3 Evaluation of Precision of Quantitative Measurement Methods-Approved Guideline-Third Edition
- Clinical and Laboratory Standards Institute EP06-A – Evaluation of the Linearity of Quantitative Measurement Procedures: A Statistical Approach; Approved Guideline
- Clinical and Laboratory Standards Institute EP07-A2 – Interference Testing in Clinical Chemistry; Approved Guideline

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- Clinical and Laboratory Standards Institute EP17-A2 – Evaluation of Detection capability for Clinical Laboratory Measurement Procedures; Approved Guideline 2nd Edition
- Clinical and Laboratory Standards Institute EP28-A3c – Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Guideline, Third Edition

## VII Performance Characteristics (if/when applicable):

## A Analytical Performance:

### 1. Precision/Reproducibility:

The precision of the Diazyme DZ-Lite iFlash Total βhCG Assay was evaluated based upon recommendations in the CLSI EP05-A2 guideline. In the study, eight serum samples and two levels of serum based controls were tested in duplicates per run, 2 runs per day for 20 days using three lots of the reagents on two different Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay analyzers. The results of the within-run, between-run, between-day, and total CV% for three lots of the reagent combined are listed in the following table:

Analyzer 1 (N=240):

| Sample | Mean N=240 | Within-Run | | Between-Run | | Between-day | | Total | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| Serum1 | 1.14 | 0.073 | 6.4% | 0.062 | 5.4% | 0.095 | 8.3% | 0.13 | 11.8% |
| Serum2 | 4.47 | 0.18 | 4.1% | 0.13 | 3.0% | 0.17 | 3.8% | 0.28 | 6.3% |
| Serum3 | 17.1 | 0.67 | 3.9% | 0.62 | 3.6% | 0.61 | 3.6% | 1.10 | 6.4% |
| Serum4 | 98.3 | 1.68 | 1.7% | 1.83 | 1.9% | 3.03 | 3.1% | 3.92 | 4.0% |
| Serum5 | 1830.4 | 24.9 | 1.4% | 21.8 | 1.2% | 50.1 | 2.7% | 60.0 | 3.3% |
| Serum6 | 4317.0 | 49.7 | 1.2% | 54.1 | 1.3% | 113.1 | 2.6% | 134.9 | 3.1% |
| Serum7 | 5948.7 | 84.5 | 1.4% | 50.3 | 0.8% | 166.7 | 2.8% | 193.5 | 3.3% |
| Serum8 | 9078.6 | 93.8 | 1.0% | 112.6 | 1.2% | 250.1 | 2.8% | 289.9 | 3.2% |
| Control 1 | 1.22 | 0.066 | 5.4% | 0.045 | 3.7% | 0.125 | 10.2% | 0.148 | 12.1% |
| Control 2 | 125.6 | 2.2 | 1.7% | 1.8 | 1.5% | 3.7 | 2.9% | 4.6 | 3.7% |

Analyzer 2 (N=240):

| Sample | Mean N=240 | Within-Run | | Between-Run | | Between-day | | Total | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| Serum1 | 1.20 | 0.078 | 6.5% | 0.073 | 6.1% | 0.021 | 1.8% | 0.109 | 9.1% |
| Serum2 | 4.29 | 0.173 | 4.0% | 0.137 | 3.2% | 0.161 | 3.8% | 0.273 | 6.4% |
| Serum3 | 16.9 | 0.75 | 4.4% | 0.74 | 4.4% | 0.49 | 2.9% | 1.16 | 6.9% |
| Serum4 | 100.2 | 1.78 | 1.8% | 2.55 | 2.5% | 2.78 | 2.8% | 4.17 | 4.2% |
| Serum5 | 1871.8 | 23.6 | 1.3% | 33.3 | 1.8% | 34.1 | 1.8% | 53.2 | 2.8% |
| Serum6 | 4446.1 | 53.2 | 1.2% | 152.9 | 3.4% | 40.2 | 0.9% | 166.8 | 3.8% |
| Serum7 | 6058.3 | 65.3 | 1.1% | 173.1 | 2.9% | 119.4 | 2.0% | 220.2 | 3.6% |
| Serum8 | 9347.0 | 93.8 | 1.0% | 114.5 | 1.2% | 158.4 | 1.7% | 216.8 | 2.3% |
| Control 1 | 1.25 | 0.075 | 6.0% | 0.052 | 4.2% | 0.062 | 5.0% | 0.110 | 8.8% |
| Control 2 | 125.7 | 2.1 | 1.7% | 3.2 | 2.5% | 4.3 | 3.4% | 5.7 | 4.6% |

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2. Linearity:

The linearity of the Diazyme DZ-Lite iFlash Total $\beta$hCG Assay was evaluated by conducting three studies based upon recommendations in the CLSI EP06-A guideline.

In the first study, a high concentration serum sample was diluted with a serum sample low pool to create eleven sample dilutions with concentrations that ranged from 0.41 to 13,614 mIU/mL. In the second study, the sponsor assessed linearity of the low concentration interval by preparing eleven samples with hCG concentrations that ranged from 0.36 to 1,594 mIU/mL. The third study focused on evaluating linearity at the very low end of the analytical measuring interval using samples with hCG concentrations that encompass important medical decision limits, including a sample with a measurable hCG concentration at, or just below, the lowest point of the claimed reportable range. In all the studies each sample level was tested in triplicates using one reagent lot. The maximum deviation from linearity was found to be acceptable and supported by the results.

The results from the linearity studies and limit of quantitation studies (LOQ = 0.60 ng/mL, see below), supports the sponsor's claimed analytical measuring interval of 0.6 to 10,000 mIU/mL.

Dilution Studies

Dilution studies were performed to determine the sample recovery after a 1:100 dilution is performed either manually or automatically by the Diazyme DZ-Lite iFlash 1800 Chemiluminiscence Immunoassay Analyzer. The dilution study results support the sponsor's labeling claims that samples with hCG concentrations above 10,000 mIU/mL may be diluted 1:100 either manually or on-onboard the analyzer.

3. Analytical Specificity/Interference:

Interference

To determine the level of interference from the substances present in serum, the Diazyme DZ-Lite iFlash Total $\beta$hCG Assay was used to test three human serum samples with approximately 6 mIU/mL, 60 mIU/mL, and 600 mIU/mL ("low", "medium", and "high" respectively) hCG concentrations spiked with various concentrations of substances based upon recommendations in CLSI EP7-A2. The following endogenous substances do not interfere with this assay at the levels tested (less than 10% bias between the test sample and the control sample).

| Interferent | Concentration |
| --- | --- |
| Ascorbic Acid | 20 mg/dL |
| Bilirubin | 40 mg/dL |
| Bilirubin Conjugated | 20 mg/dL |
| Hemoglobin | 1000 mg/dL |
| Rheumatoid Factor | 2000 IU/mL |
| Triglycerides | 3000 mg/dL |

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The following substances showed no significant interference (< ± 10%) up to the concentrations summarized below.

| Interference Substance | Concentration Showing No Significant Interference |
| --- | --- |
| Total Protein | 60 mg/mL |
| Luteinizing Hormone | 500 mIU/mL |
| Follicle-Stimulating Hormone | 200 mIU/mL |
| Human Growth Hormone | 100 ng/mL |
| Thyroid-Stimulating Hormone | 37 mIU/mL |
| Acetylsalicylic Acid | 0.2 mg/mL |
| EDTA | 0.8 mg/mL |
| Ethanol | 1% |
| Gentisic Acid | 0.2 mg/mL |
| Glucose | 5 mg/mL |
| Salicylic Acid | 0.2 mg/mL |

## Hook Effect

No High dose hook effect was observed for hCG concentrations in serum up to 1,000,000 mIU/mL.

4. Assay Reportable Range:

The Analytical Measuring Range (AMR) is claimed to be 0.6 – 10,000 mIU/mL.

5. Traceability, Stability, Expected Values (Controls, Calibrators, or Methods):

Traceability: This assay is traceable to the WHO 5th International Standard 07/364.

6. Detection Limit:

The LoB, LoD, LoQ of the Diazyme DZ-Lite iFlash Total βhCG Assay was determined based upon recommendations in CLSI EP17-A2.

Limit of blank (LoB) is the highest concentration that is likely to be observed for a blank sample. To calculate the LoB, six hCG free blank samples collected were run with 5 replicates on at least three different days with three lots of hCG reagent on three Diazyme DZ-Lite iFlash 1800 analyzers respectively.. The LOB was determined to be 0.06 mIU/mL.

Limit of detection (LoD) is the lowest concentration of analyte that can be detected reliably. Five serum samples with hCG collected from medical laboratory were diluted with a normal serum to a level approximately 1-4 times LoB and tested with three lots of HCG reagent on the iFlash 1800 with 15 replicates over three days (5 replicates per day).. The LoD was determined to be 0.14 mIU/mL.

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Limit of quantitation (LoQ) is the lowest concentration which is the design requirements of TEa%(Total Error Allowance) of ≤32%. Seven hCG free serum samples were spiked with 5th WHO international standard to target concentrations respectively. The diluted serum samples were tested with three lots of the Diazyme DZ-Lite iFlash Total βhCG Assay reagents on three Diazyme DZ-Lite iFlash 1800 analyzers with 5 replicates per run, one run per day for 3 days (15 replicates total per sample) on corresponding iFlash 1800 using three lots of the reagents. The LoQ was determined to be 0.60 mIU/mL.

7. Assay Cut-Off:
Not applicable.

8. Accuracy (Instrument)
Not applicable.

9. Carryover
High sample containing 9285mIU/mL hCG and a low sample containing 4.22mIU/mL hCG were tested in duplicate, alternating 18 times (i.e. HH,LL,HH,LL, etc.) on the iFlash 1800 analyzer with one reagent lot with no carryover effect.

B Comparison Studies:

1. Method Comparison with Predicate Device:
A total of 141 female human serum samples were tested with the Diazyme DZ-Lite iFlash Total βhCG Assay and the results obtained were compared to the predicate method. The regression results are shown in the following table:

| Parameter | Passing Bablok |
| --- | --- |
| n | 141 |
| Slope | 0.9976 |
| 95% CI | 0.9806-1.0165 |
| Intercept | 0.3227 |
| 95% CI | -4.3128-5.0253 |
| Correlation Coefficient (R²) | 0.9936 |
| Sample Range | 2.7-9922 |

2. Matrix Comparison:
Not applicable. The assay has been validated for use with serum samples only.

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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):
Not applicable.

D Clinical Cut-Off:
Not applicable.

E Expected Values/Reference Range:

Expected Values: To establish the reference interval for the iFlash-HCG Assay, serum samples from 120 apparently healthy, non-pregnant premenopausal women of Ages 21-50 and 124 postmenopausal women of Ages ≥ 50 were tested using the iFlash-HCG Assay on the iFlash 1800 analyzer based upon recommendations in the CLSI C28-A3 guideline. The central 95% reference interval was established to be ≤ 0.4 mIU/mL for premenopausal women and ≤ 3.0 mIU/mL for post-menopausal women.

It is recommended that each laboratory establish its own expected reference range for the specific population.

F Other Supportive Instrument Performance Characteristics Data:
Not applicable.

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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