MagXtract Collection Tube

K212113 · Magbio Genomics, Inc. · QBD · Jul 28, 2022 · Microbiology

Device Facts

• Record ID: K212113
• Device Name: MagXtract Collection Tube
• Applicant: Magbio Genomics, Inc.
• Product Code: QBD · Microbiology
• Decision Date: Jul 28, 2022
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 866.2950
• Device Class: Class 2

Indications for Use

The MagXtract collection tube collection tube is intended for the stabilization, transportation, and direct lysis of infectious unprocessed nasopharyngeal samples suspected of containing SARS-COV-2 virus RNA. These devices can be used for collection transport and storage of specimens at refrigerated (2-8°C) or ambient temperatures (20-25°C). Specimens collected and stored in a MagXtract collection tube are suitable for use with legally marketed molecular diagnostic devices.

Device Story

MagXtract Collection Tube is a sterile 5 mL cryogenic tube pre-filled with 1.2 mL of proprietary MagBio CTL Medium. It is used for the collection, transport, and storage of nasopharyngeal swab samples suspected of containing SARS-CoV-2. The device functions by chemically lysing cells and stabilizing viral RNA at ambient or refrigerated temperatures. The tube is used by healthcare professionals at the point of collection; samples are then transported to a laboratory. In the lab, the stabilized sample is processed (e.g., using paramagnetic beads on a KingFisher Flex system) to extract RNA for downstream molecular diagnostic testing (e.g., RT-PCR). By preserving RNA integrity during transport, the device ensures accurate diagnostic results, facilitating timely clinical decision-making for COVID-19 management.

Clinical Evidence

Bench testing only. No clinical data. Analytical performance established via LoD testing (1.0x10^1 TCID50/mL) using 20 replicates. RNA stability confirmed over 5 days at 2-8°C and 20-25°C with maximum Ct change of 1.3. Viral inactivation efficacy demonstrated against 1.0x10^6 TCID50/mL SARS-CoV-2 after 60 minutes exposure using cell culture-based viability assays.

Technological Characteristics

Sterile 5 mL cryogenic plastic collection tube containing 1.2 mL proprietary stabilization/lysis buffer (MagBio CTL Medium). Functions via chemical lysis and RNA stabilization. Compatible with standard molecular diagnostic workflows. No electronic components or software.

Indications for Use

Indicated for the stabilization, transportation, and direct lysis of infectious unprocessed nasopharyngeal samples suspected of containing SARS-COV-2 virus RNA in patients requiring molecular diagnostic testing.

Regulatory Classification

Identification

A microbial nucleic acid storage and stabilization device is a device that consists of a container and reagents intended to stabilize microbial nucleic acids in human specimens for subsequent isolation and purification of nucleic acids for further molecular testing. The device is not intended for preserving morphology or viability of microorganisms.

Special Controls

The special controls for this device are: (1) The intended use for the 21 CFR 809.10 labeling must include a detailed description of microorganisms and types of human specimens intended to be preserved. (2) The 21 CFR 809.10(b) labeling must include: (i) A detailed device description, including all device components. (ii) Performance characteristics from applicable analytical studies, including but not limited to, nucleic acid stability and microorganism inactivation. (iii) A limiting statement that erroneous results may occur when the transport device is not compatible with molecular testing. (iv) A limiting statement that the device has only been validated to preserve the representative microorganisms used in the analytical studies. (3) Design verification and validation must include the following: (i) Overall device design including all device components and all control elements incorporated into the analytical validation procedures. (ii) Thorough description of the microorganisms and methodology used in the validation of the device including, but not limited to, extraction platforms and assays used for the detection of preserved nucleic acids. (iii) The limit of detection (LoD) of the molecular test used to establish microorganism nucleic acid stability.

*Classification.* Class II (special controls). The special controls for this device are:(1) The intended use for the labeling required under § 809.10 of this chapter must include a detailed description of microorganisms and types of human specimens intended to be preserved. (2) The labeling required under § 809.10(b) of this chapter must include the following: (i) A detailed device description, including all device components; (ii) Performance characteristics from applicable analytical studies, including nucleic acid stability and microorganism inactivation; (iii) A limiting statement that erroneous results may occur when the transport device is not compatible with molecular testing; and (iv) A limiting statement that the device has only been validated to preserve the representative microorganisms used in the analytical studies. (3) Design verification and validation must include the following: (i) Overall device design, including all device components and all control elements incorporated into the analytical validation procedures; (ii) Thorough description of the microorganisms and methodology used in the validation of the device including, extraction platforms and assays used for the detection of preserved nucleic acids; and (iii) The limit of detection (LoD) of the molecular test used to establish microorganism nucleic acid stability.

Predicate Devices

• PrimeStore MTM (DEN170029)

Submission Summary (Full Text)

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FDA

U.S. FOOD & DRUG

ADMINISTRATION

# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY

ASSAY ONLY

## I Background Information:

A 510(k) Number

K212113

B Applicant

MagBio Genomics, Inc.

C Proprietary and Established Names

MagXtract Collection Tube

D Regulatory Information

| Product Code(s) | Classification | Regulation Section | Panel |
| --- | --- | --- | --- |
| QBD | Class II | 21 CFR 866.2950 - Microbial Nucleic Acid Storage And Stabilization Device | MI - Microbiology |

## II Submission/Device Overview:

A Purpose for Submission:

To make a substantial equivalence determination for the MagXtract Collection Tube for the collection, transport, and storage of viral specimens to the laboratory for downstream testing.

B Measurand:

Storage and stability of nucleic acids SARS-CoV-2 viruses.

C Type of Test:

Microbial nucleic acid storage and stabilization device.

## III Intended Use/Indications for Use:

Food and Drug Administration

10903 New Hampshire Avenue

Silver Spring, MD 20993-0002

www.fda.gov

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A Intended Use(s):
See Indications for Use below.

B Indication(s) for Use:
The MagXtract collection tube collection tube is intended for the stabilization, transportation, and direct lysis of infectious unprocessed nasopharyngeal samples suspected of containing SARS-COV-2 virus RNA. These devices can be used for collection transport and storage of specimens at refrigerated (2-8°C) or ambient temperatures (20-25°C). Specimens collected and stored in a MagXtract collection tube are suitable for use with legally marketed molecular diagnostic devices.

C Special Conditions for Use Statement(s):
Rx - For Prescription Use Only

D Special Instrument Requirements:
N/A

IV Device/System Characteristics:

A Device Description:
The MagXtract collection tube is intended for the collection, transportation, direct lysis, and stabilization of RNA from unprocessed nasopharyngeal (NP) swab samples suspected of containing SARS-COV-2. The MagXtract collection tube stores and transports specimens in a closed tube. Proper specimen collection and transport are essential in molecular testing and obtaining accurate test results. MagXtract collection tube allows for the stabilization and transportation of nasopharyngeal swab samples at refrigeration and ambient temperature from the collection site to the processing laboratory. The MagXtract collection tube consists of a sterile plastic, 5 ml cryogenic collection tube pre-filled with 1.2 mL of proprietary stabilization/lysis buffer (MagBio CTL Medium).

B Principle of Operation:
MagBio CTL Medium is intended to disrupt/lyse cells and stabilize SARS-COV-2 RNA. The preserved and stabilized RNA maintains its integrity for downstream molecular based detection/analysis. MagXtract collection tube may be used in conjunction with an NP swab or as a tube alone. The MagXtract collection tube is designed for storage of specimens between 34-38°F (2-4°C) and 68-77 °F (20-25 °C) for up to 5 days.

The media contains the following reagents:
- Detergents
- pH buffers
- Distilled water

V Substantial Equivalence Information:

A Predicate Device Name(s):
PrimeStore MTM

B Predicate 510(k) Number(s):

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DEN170029

C Comparison with Predicate(s):

| Device & Predicate Device(s): | Device: K212113 | Predicate: DEN170029 |
| --- | --- | --- |
| Device Trade Name | | |
| General Device Characteristic Similarities | | |
| Intended Use/Indications For Use | The MagXtract collection tube collection tube is intended for the stabilization, transportation, and direct lysis of infectious unprocessed nasopharyngeal samples suspected of containing SARS-COV-2 virus RNA. These devices can be used for collection transport and storage of specimens at refrigerated (2-8°C) or ambient temperatures (20-25°C). Specimens collected and stored in a MagXtract collection tube are suitable for use with legally marketed molecular diagnostic devices. | PrimeStore MTM is intended for the stabilization, transportation and inactivation of infectious unprocessed nasal washes suspected of containing Influenza A virus RNA. PrimeStore MTM is also intended for the stabilization, transportation and inactivation of infectious unprocessed sputum samples suspected of containing Mycobacterium tuberculosis DNA from human samples. |
| Inactivation test | Inactivaes virus | same |
| General Device Characteristic Differences | | |
| Specimen stability | MagXtract collection tube preserves SARS-CoV-2 RNA for up to 5 days at 2-4°C and 20-25°C. | Primestore MTM medium preserves influenza A RNA for up to 8 days at 27°C and 29 days at 4°C. |
| Specimen Type | Nasopharyngeal swab suspected of containing SARS-CoV-2. | Nasal wash suspected of containing Influenza A virus. Sputum samples suspected of containing MTB. |

VI Standards/Guidance Documents Referenced:

Special controls that are applicable to regulation 21 CFR 866.2950.

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VII Performance Characteristics (if/when applicable):

A Analytical Performance:

1. Precision/Reproducibility:
N/A

2. Linearity:
N/A

3. Analytical Specificity/Interference:
N/A

4. Assay Reportable Range:
N/A

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

Shelf life: The shelf life for the MagXtract Collection Tube is 12 months after the date of manufacture. The stability of the MagXtract Collection Tube was performed using Realtime stability on a total of three (3) lots. Stability looked for bacterial and fungal growth contaminants in the media along with properties of the media, appearance, pH, and then confirmed with viral stabilization at room temperature demonstrating the stability of nucleic acids was not diminished with the age of media.

Sterilization: The MagXtract Collection Tube with media are not sold as sterile nor are they intended to be sterilized by the user. These vials are single use devices that do not require cleaning by the operator.

6. Detection Limit:

a) LoD testing was conducted to determine the lowest concentration of analyte that can be detected with a greater than 95% detection rate. Preliminary LoD testing for SARS-CoV-2 (USA-WA1/2020) was performed by spiking multiple concentrations of SARS-Cov-2, in triplicate, into media with negative clinical matrix. SARS-CoV-2 was spike at the following concentrations 1.0x10⁵, 1.0x10⁴, 1.0x10³, 1.0x10², 1.0x10¹, and 1.0x10⁰ TCID₅₀/mL into the media with a COPAN NP FLOQSwabs. The preliminary LoD was determined to be 1.0x10¹ TCID₅₀/mL for both viruses. At a concentration of 1.0x10⁰ none of the SARS-CoV-2 targets were detected. The MagXtract Collection Tube contains MagBio CTL Medium that acts as both a transport medium and lysis buffer. Therefore, there was no need for viral lysis step as the virus has already been lysed in the collection tube. Paramagnetic beads were added directly to the media to capture the RNA already in the collection tube. Final RNA isolation was conducted on the KingFisher Flex using

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Bindit software. Amplificaton of SARS-Cov-2 was done following Thermofischer TaqPath COVID-19 Combo Kit protocol for SARS-COV-2 detection.

Confirmatory LoD testing was provided at a concentration of $1.0 \times 10^{1} \mathrm{TCID}_{50} / \mathrm{mL}$ with 20 replicates for SARS-CoV-2. The acceptance criteria of virus detection was least $95\%$ of the replicates were recoverable within the detectabel range. At a concentration of $1.0 \times 10^{1} \mathrm{TCID}_{50} / \mathrm{mL}$ , 20 of 20 replicates had recoverable concentrations. The Ct values for each virus and target are listed below in Table 1.

Table 1. Limit of detection ${\mathrm{C}}_{\mathrm{t}}$ values

| | CtValue | | |
| --- | --- | --- | --- |
| Replicates | SARS-CoV-2, N gene | SARS-CoV-2, ORF1ab gene | SARS-CoV-2, S gene |
| 1 | 29.3 | 32.6 | 31.2 |
| 2 | 30.2 | 34.3 | 31.5 |
| 3 | 30.6 | 34.3 | 33.0 |
| 4 | 30.5 | 34.1 | 32.7 |
| 5 | 29.6 | 33.9 | 32.5 |
| 6 | 29.6 | 31.9 | 30.2 |
| 7 | 28.8 | 31.7 | 30.6 |
| 8 | 30.2 | 33.9 | 30.5 |
| 9 | 30.6 | 35.0 | 32.3 |
| 10 | 30.2 | 32.5 | 31.0 |
| 11 | 30.2 | 34.4 | 31.0 |
| 12 | 30.4 | 33.0 | 32.1 |
| 13 | 29.3 | 33.8 | 30.8 |
| 14 | 30.4 | 33.0 | 30.7 |
| 15 | 29.6 | 35.3 | 31.5 |
| 16 | 28.9 | 35.6 | 29.6 |
| 17 | 28.8 | 33.3 | 32.2 |
| 18 | 29.2 | 32.6 | 32.5 |
| 19 | 30.5 | 32.5 | 29.6 |
| 20 | 30.9 | 34.0 | 32.4 |
| AVG: | 29.9 | 33.6 | 32.4 |
| SDV: | 0.67 | 1.10 | 1.03 |

LoD testing at $1.0 \times 10^{1} \mathrm{TCID}_{50} / \mathrm{mL}$ resulted in all 20 replicates for the concentration meeting the pre-defined acceptance criteria.

# b) Viral Stability

The RNA stability of SARS-CoV-2 was conducted at $1 \times 10^{1} \mathrm{TCID}_{50} / \mathrm{mL}$ . Samples were prepared using negative clinical matrix and tested as described in the LoD study above and added to collection tubes. Collection tubes were tested imeadately to establish a time point zero. Collection tubes were also stored at refrigeration (2-8°C, 36-39°F) and room temperature (20-25°C, 68-77°F) for later analysis at various time points.

Time zero was used as the initial $C_t$ average for each of the two temperature ranges tested with each virus. Testing additional time points was performed. The pre-defined

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acceptance criteria of $(+/-)$ $3.0\mathrm{C_t}$ from the initial time zero value was applied to the RNA study. RNA was determined to be stabilized when the predefined acceptance criteria was met. The data supports the claimed 5 day RNA stabilization for refrigeration and room tmeprature, see tables 2 and 3 below.

Table 2. SARS-CoV-2 (1.0x10 $^{1}$ TCID $_{50}$ /mL) stability at 2-8°C

| | Day 0 | Day 1 | Day 5 |
| --- | --- | --- | --- |
| SARS-CoV-2 N gene ave (Ct): | 27.8 | 28.7 | 27.6 |
| SARS-CoV-2 S gene ave (Ct): | 29.4 | 30.3 | 28.7 |
| SARS-CoV-2 ORF1ab ave (Ct): | 32.3 | 32.5 | 32.5 |

Table 3. SARS-CoV-2 (1.0x10 $^{1}$ TCID $_{50}$ /mL) stability 20-25°C

| | Day 0 | Day 1 | Day 5 |
| --- | --- | --- | --- |
| SARS-CoV-2 N gene ave (Ct): | 28.4 | 27.4 | 27.1 |
| SARS-CoV-2 S gene ave (Ct): | 29.4 | 30.7 | 28.5 |
| SARS-CoV-2 ORF1ab ave (Ct): | 33.3 | 33.8 | 33.8 |

Stability testing of RNA from SARS-CoV-2 when spiked into matrix resulted in a maximum change of $1.3\mathrm{C_t}$ over 5 days at $25^{\circ}\mathrm{C}$ and a maximum change of $0.9\mathrm{C_t}$ over 5 days at $2 - 8^{\circ}\mathrm{C}$ .

c) Inactivation

An inactivation of SARS-CoV-2 was conducted using a concentration of $1.0 \times 10^{6}$ $\mathrm{TCID}_{50} / \mathrm{ml}$ of virus. The virus was incubated in the MagXtract Collection Tube with $1.2\mathrm{mL}$ of MagBio CTL Medium in MagXtract for 60 minutes. The inactivation study tested virus only, virus in the MagXtract Collection Tube media and MagXtract Collection Tube media only. These three conditions were all tested using a cell culture based viability assay. The virus only and media only serve as the controls.

Three days after cells are inoculation with virus, virus and media or media only, the cells were fixed and stained with $1.0\%$ crystal violet in $22\%$ formaldehyde. Cells that did not take up the stain were considered evidence of a viral cytopathic effect (CPE) and as a result were considered a measure of viral viability. The titer of the virus CPE was calculated and recorded as plaque forming units PFUs.

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Inactivation time:

The MagXtract Collection Tube media showed no cytotoxicity on Vero E6 cells at a 1:100 dilution factor and greater; therefore at least a 1:100 dilution factor is needed to avoid a direct cytotoxic effect of the MagXtract Collection Tube media. SARS-CoV-2, was then exposed to MagXtract Collection Tube media for 60 minutes prior to serial 10 fold dilutions and inoculated onto the cells. SARS-CoV-2 samples had an initial concentration of greater than 1.0 x 10⁶ TCID₅₀.

SARS-CoV-2 was inactivated when exposed to the MagXtract Collection Tube media for 60 minutes and longer. The media showed total inactivation of virus (1.0 x 10⁶ TCID₅₀) when used at a concentration of undiluted to 1:100. MagXtract Collection Tube media must be used undiluted to no more than 1:100 for a minimum of 60 minutes exposure time to demonstrate inactivation of SARS-CoV-2. Measuring SARS-CoV-2 inactivation below a dilution of 1:100 was not possible because of the cytotoxic affects MagXtract Collection Tube media has on the cell culture based viability assay.

7. Assay Cut-Off:
N/A

B Comparison Studies:

1. Method Comparison with Predicate Device:
N/A

2. Matrix Comparison:
N/A

C Clinical Studies:

1. Clinical Sensitivity:
N/A

2. Clinical Specificity:
N/A

3. Other Clinical Supportive Data (When 1. and 2. Are Not Applicable):
N/A

D Clinical Cut-Off:
N/A

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E Expected Values/Reference Range:

N/A

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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