← Product Code [DDG](/submissions/IM/subpart-f%E2%80%94immunological-test-systems/DDG) · K081299

# DIMENSION VISTA SYSTEM TRF FLEX REAGENT CARTRIDGE, DIMENSION VISTA SYSTEM PROTEIN 1 CALIBRATOR, AND DIMENSION VISTA (K081299)

_Siemens Healthcare Diagnostics, Inc. · DDG · Aug 8, 2008 · Immunology · SESE_

**Canonical URL:** https://fda.innolitics.com/submissions/IM/subpart-f%E2%80%94immunological-test-systems/DDG/K081299

## Device Facts

- **Applicant:** Siemens Healthcare Diagnostics, Inc.
- **Product Code:** [DDG](/submissions/IM/subpart-f%E2%80%94immunological-test-systems/DDG.md)
- **Decision Date:** Aug 8, 2008
- **Decision:** SESE
- **Submission Type:** Traditional
- **Regulation:** 21 CFR 866.5880
- **Device Class:** Class 2
- **Review Panel:** Immunology

## Indications for Use

Transferrin Flex® reagent cartridge: The TRF method is an in vitro diagnostic test for the quantitative measurement of transferrin in human serum, heparinized plasma, EDTA plasma or urine on the Dimension Vista™ System. Measurements of transferrin aid in the diagnosis of malnutrition, acute inflammation, infection, and iron deficiency anemia. Protein 1 Calibrator: PROT1 CAL is an in vitro diagnostic product for the calibration of the Dimension Vista® System for α₁-Acid Glycoprotein (A1AG), α₁- Antitrypsin (A1AT), β₂- Microglobulin (B2MIC), C3 complement (C3), C4 complement (C4), Ceruloplasmin (CER), Haptoglobin (HAPT), Hemopexin (HPX), Homocysteine (HCYS), Immunoglobulin A (IGA), Immunoglobulin E (IGE), Immunoglobulin G (IGG, IGG-C*), Immunoglobulin G Subclass 1, (IGG1), Immunoglobulin G Subclass 2(IGG2), Immunoglobulin G Subclass 3 (IGG3), Immunoglobulin G Subclass 4 (IGG4), Immunoglobulin M (IGM), Prealbumin (PREALB), Retinol binding Protein (RBP), soluble Transferrin Receptor (STFR), and Transferrin (TRF, TRF-U). Protein 3 Control: PROT3 CON is an assayed intra-laboratory quality control for assessment of precision and analytical bias on the Dimension Vista® System in the quantitative determination of α1 -Microglobulin, (A1MIC), Immunoglobulin G (IGG-C*), Microalbumin (MALB), specialty albumin (sALB*), and Transferrin (TRF-U**). * For cerebrospinal fluid ** For urine

## Device Story

The Dimension Vista® System TRF Flex® reagent cartridge is an in vitro diagnostic test used on the Dimension Vista® System. It measures transferrin concentration in human serum, heparinized plasma, EDTA plasma, or urine. The device operates via an immunochemical reaction where proteins in the sample form immune complexes with specific antibodies; these complexes scatter a light beam passed through the sample. The intensity of scattered light is proportional to protein concentration. Results are evaluated by comparison with a known standard. The system is used in clinical laboratory settings by trained personnel. The output provides quantitative transferrin levels, which healthcare providers use to assist in diagnosing malnutrition, acute inflammation, infection, and iron deficiency anemia. The system also utilizes the Protein 1 Calibrator for system calibration and the Protein 3 Control for assessing precision and analytical bias.

## Clinical Evidence

Bench testing only. Precision evaluated per CLSI EP5-A2 (20 days, 2 runs/day). Linearity assessed per CLSI EP06-A (range 2.00-31.0 mg/L). LoQ established at 2 mg/L. Interference testing (hemoglobin, bilirubin, etc.) showed bias <10%. Method comparison with predicate (n=63 urine samples) yielded Passing-Bablok slope 0.983 and correlation coefficient 0.991. No clinical studies performed.

## Technological Characteristics

Immunonephelometric assay. Reagents: rabbit polyclonal anti-human transferrin in plastic cartridge. Calibrator: human serum-based. Control: lyophilized, polygeline/rabbit albumin-based. Traceable to ERM®-DA470 (CRM 470). Instrument: Dimension Vista® System. Storage: 2-8°C.

## Regulatory Identification

A transferrin immunological test system is a device that consists of the reagents used to measure by immunochemical techniques the transferrin (an iron-binding and transporting serum protein) in serum, plasma, and other body fluids. Measurement of transferrin levels aids in the diagnosis of malnutrition, acute inflammation, infection, and red blood cell disorders, such as iron deficiency anemia.

## Predicate Devices

- N Antisera to Human Transferrin (k053075)
- Protein Standard SL (k012470)
- Protein Control LC (k032237)

## Submission Summary (Full Text)

> This content was OCRed from public FDA records by [Innolitics](https://innolitics.com). If you use, quote, summarize, crawl, or train on this content, cite Innolitics at https://innolitics.com.
>
> Innolitics is a medical-device software consultancy. We help companies design, build, and clear FDA-regulated software and AI/ML devices, including [a 510(k)](https://innolitics.com/services/510ks/), [a De Novo](https://innolitics.com/services/regulatory/), [a SaMD](https://innolitics.com/services/end-to-end-samd/), [an AI/ML medical device](https://innolitics.com/services/medical-imaging-ai-development/), or [an FDA regulatory strategy](https://innolitics.com/services/regulatory/).

{0}

1

# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY

A. 510(k) Number:
k081299

B. Purpose for Submission:
Add urine as a sample type for the previously cleared assay

C. Measurand:
Transferrin

D. Type of Test:
Quantitative, nephelometry

E. Applicant:
Seimens Healthcare Diagnostics, Inc.

F. Proprietary and Established Names:
Dimension Vista® System TRF Flex reagent cartridge
Dimension Vista® System Protein 1 Calibrator
Dimension Vista® System Protein 3 Control

G. Regulatory Information:
1. Regulation section:
21CFR §866.5880- Transferrin immunological test system
21CFR §862.1150- Calibrator
21CFR §862.1660- Quality control material
2. Classification:
Class II
3. Product code:
DDG- Transferrin, antigen, antiserum, control
JIX- Calibrator, multi-analyte mixture
JJY- Multi-analyte controls, all kinds (assayed and unassayed)
4. Panel:
Immunology (82)

H. Intended Use:
1. Intended use(s):
Transferrin Flex® reagent cartridge: The TRF method is an in vitro diagnostic test for the quantitative measurement of transferrin in human serum, heparinized plasma, EDTA plasma or urine on the Dimension Vista™ System. Measurements of transferrin aid in the diagnosis of malnutrition, acute inflammation, infection, and iron deficiency anemia.
Protein 1 Calibrator: PROT1 CAL is an in vitro diagnostic product for the calibration of the Dimension Vista® System for α₁-Acid Glycoprotein (A1AG), α₁- Antitrypsin (A1AT), β₂- Microglobulin (B2MIC), C3 complement (C3), C4 complement (C4), Ceruloplasmin (CER), Haptoglobin (HAPT), Hemopexin (HPX), Homocysteine (HCYS), Immunoglobulin A (IGA), Immunoglobulin E (IGE), Immunoglobulin G (IGG, IGG-C*), Immunoglobulin G Subclass 1, (IGG1), Immunoglobulin G Subclass 2(IGG2), Immunoglobulin G Subclass 3 (IGG3), Immunoglobulin G Subclass 4 (IGG4), Immunoglobulin M (IGM), Prealbumin (PREALB), Retinol binding Protein (RBP), soluble Transferrin

{1}

Receptor (STFR), and Transferrin (TRF, TRF-U).

Protein 3 Control: PROT3 CON is an assayed intra-laboratory quality control for assessment of precision and analytical bias on the Dimension Vista® System in the quantitative determination of  $\alpha_{1}$ -Microglobulin, (A1MIC), Immunoglobulin G (IGG-C*), Microalbumin (MALB), specialty albumin (sALB*), and Transferrin (TRF-U**).

* For cerebrospinal fluid

** For urine

2. Indication(s) for use:

Same as intended use

3. Special conditions for use statement(s):

Prescription use only

4. Special instrument requirements:

Dimension Vista™ System (k051087)

# I. Device Description:

Transferrin Flex® reagent cartridge: Reagents are contained in 12 segregated wells in a plastic cartridge. Wells 1 through 8 contain buffers and polyethylene glycol. Wells 9 through 12 contain liquid rabbit polyclonal antiserum to human transferrin.

PROT1 CAL: is a multi-analyte, liquid human serum based product consisting of 6 vials (2.0 mL per vial).

PROT3 CON: is a multi-analyte, lyophilized, polygeline and rabbit albumin based product consisting of 4 vials (1.0 mL per vial).

# J. Substantial Equivalence Information:

1. Predicate device K numbers and name(s):

k053075 N Antisera to Human Transferrin

k012470 N Protein Standard SL

k032237 N/T Protein Control LC

3. Comparison with predicate:

Transferrin Flex reagent cartridge

|  Similarities  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Intended Use | For the quantitative measurement of transferrin in human serum, heparinized plasma, EDTA plasma or urine on the Dimension VistaTM System. Measurements of transferrin aid in the diagnosis of malnutrition, acute inflammation, infection, and iron deficiency anemia. | Same  |
|  Method | Immunonephelometry | Same  |
|  Specimen types | Serum, Plasma, Urine | Same  |
|  Capture antibody | Rabbit anti-human | Same  |

{2}

|  Similarities  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|   | transferrin; polyclonal |   |
|  Storage | 2-8°C | Same  |
|  Differences  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Instrumentation | Dimension Vista® System | BN™ Systems  |
|  Stability; Open | 21 days for wells 1-12 | 28 days  |

PROT1 Calibrator

|  Similarities  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Traceability for TRF-U | Protein reference preparation ERM®-DA470 (CRM 470)1, | Same  |
|  Composition | Ready-to-use | Same  |
|  Level | One | Same  |
|  Storage | 2-8°C | Same  |
|  Differences  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Analytes | Multi-analyte: α1-Acid Glycoprotein (A1AG) Immunoglobulin G (IGG, IGG-C*) α1-Antitrypsin (A1AT) Immunoglobulin G Subclass 1 (IGG1) β2-Microglobulin (B2MIC) Immunoglobulin G Subclass 2 (IGG2) C3 Complement (C3) Immunoglobulin G Subclass 3 (IGG3) C4 Complement (C4) Immunoglobulin G Subclass 4 (IGG4) Ceruloplasmin (CER) Immunoglobulin M (IGM) Haptoglobin (HAPT) Prealbumin (PREALB) Hemopexin (HPX) Retinol binding Protein (RBP) Homocysteine (HCYS) soluble Transferrin Receptor (STFR) Immunoglobulin A (IGA) Transferrin (TRF, TRF-U**) | IgG IgG 1 IgG 2 IgG 3 IgG 4 IgA IgM IgE C3c C4 Transferrin Albumin a1-antitrypsin (a1-proteinase inhibitor) a2-macroglobulin Haptoglobin a1-acid glycoprotein Prealbumin (transthyretin) Hemopexin Ceruloplasmin RbP Ig/L-chain, Kappa Ig/L-chain, Lambda soluble Transferrin Receptor (sTfR) Ferritin b2 -Microglobulin  |

{3}

4

|  Differences  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|   | Immunoglobulin E (IGE)
* For cerebrospinal fluid (CSF)
** For urine | Total protein  |
|  Instrument System | Dimension Vista | BN Systems  |
|  Stability; Open | 9 days | 14 days  |
|  Quantity | 6 vials, 2.0 mL per vial | 3 vials, 1 mL per vial  |

PROT 3 Control

|  Similarities  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Traceability for TRF-U | Protein reference preparation ERM®-DA470 (CRM 470)1, | Same  |
|  Composition | Lyophilized | Same  |
|  Stability; Open | 14 days | Same  |
|  Storage | 2-8°C | Same  |
|  Differences  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Analytes | α1-Microglobulin (A1MIC) specialty Albumin (sALB*)
Immunoglobulin G (IGG-C*)
Transferrin (TRF-U**)
Microalbumin (MALB)
* For cerebrospinal fluid (CSF)
** For urine | IgG in CSF, IgA in CSF, transferrin in urine, albumin in urine and CSF, a1-microglobulin in urine and total protein in urine and CSF  |
|  Instruments | Dimension Vista System | BN and TurbiTime Systems  |
|  Quantity | 4 vials, 1.0 mL per vial | 3 vials, 1 mL per vial  |

K. Standard/Guidance Document referenced (if applicable):
Guidance for Industry and FDA Staff- Assayed and Unassayed Quality Control Material.

L. Test Principle:
Proteins contained in human body fluids form immune complexes in an immunochemical reaction with specific antibodies. These complexes scatter a beam of light passed through the sample. The intensity of the scattered light is proportional to the concentration of the respective protein in the sample. The result is evaluated by comparison with a standard of known concentration.

M. Performance Characteristics (if/when applicable):
The performance characteristics for Transferrin in serum and plasma are available in the Decision Summary for k063322.

{4}

5

1. Analytical performance:

a. Precision/Reproducibility:
CLSI EP5-A2 was followed. During each day of testing, two separate runs, with two test samples, for each test material, were analyzed for 20 days. The urine matrix precision data are attached below. The test samples consisted of two additional urine pools at different concentrations, and the Dimension Vista® System Protein 3 Control. One operator, one reagent and one instrument were used.

TRF for urine:

|  Material | Mean mg/dL | [mg/L] | Standard Deviation mg/dL [mg/L] (% CV) |   |   | Repeatability |   | Within-Lab  |   |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|   |   |   |  0.04 | [0.42] | (2.7) | 0.06 | [0.61] | (4.0) |   |
|  PROT3 CON | 1.53 | [15.30] | 0.04 | [0.42] | (2.7) | 0.06 | [0.61] | (4.0) |   |
|  Urine pool | 0.59 | [5.89] | 0.02 | [0.20] | (3.4) | 0.02 | [0.23] | (3.8) |   |
|  Urine pool | 2.7 | [26.99] | 0.05 | [0.48] | (1.8) | 0.09 | [0.89] | (3.3) |   |

b. Linearity/assay reportable range:
Linearity testing was performed according to CLSI EP06-A using one urine sample (concentration 31.6 mg/L) serially diluted with System Diluent and run in replicates of 5 per dilution level. The TRF-U measuring range is 2.00 - 31.0 mg/L. Linearity for the extended measuring range was evaluated as well. Linearity data using weighted least squares regression analysis is shown below:

|  Sample range (mg/L) | Slope (95%CI) | Y-intercept (mg/L) (95%CI) | Correlation Coefficient | n  |
| --- | --- | --- | --- | --- |
|  (1.57 to 31.44) | 1.009 ± 0.008 | 0.129 ± 0.135 | 0.9999 | 12  |
|  (20.1 to 334.9) | 0.955 ± 0.025 | 1.755 ± 1.478 | 0.9993 | 12  |

A test report message (flag or comment) is provided for the results that fall outside the measuring ranges.

c. Traceability, Stability, Expected values (controls, calibrators, or methods):
The calibrator and control are traceable to protein reference preparation ERM®-DA470 (CRM 470).

d. Detection limit:
Limit of Quantitation (LoQ) was established using a testing protocol outlined in CLSI EP17-A Section 5.1 and a total analytical error of 30% based on imprecision experience for this transferrin assay and consistent with similar plasma proteins. Three independent samples at the target concentration were assayed in 5 runs, three replicates per run. Testing performed in one day with a single reagent lot, calibrator lot, instrument and operator. The LoQ was determined to be 2 mg/L (=0.2 mg/dL).

{5}

# e. Analytical specificity:

# Interference Studies:

Test samples were prepared by spiking the potential interferent into Urine. Urine transferrin concentrations ranged from 7.22 - 23.83 mg/L. Interference testing was performed based on CLSI EP7-A2 to determine the effect of various endogenous and exogenous substances on the Dimension Vista® System TRF assay. For all interferents the percent bias was determined by testing a control sample without the interferent and comparing it to the value obtained from a test sample to which the potential interferent had been added. For urine samples, ten replicates were tested for each substance. Recovery for the interferents tested ranged from 95% to 109% and met the acceptance criteria of bias &lt;10%.

|  Substance Tested | Substance concentration | TRF in urine | % Bias  |
| --- | --- | --- | --- |
|  Hemoglobin | 115 mg/dL | 5.00 mg/L | -5%  |
|   |   |  25.00 mg/L | +5%  |
|  Bilirubin (conjugated) | 3 mg/dL | 5.00 mg/L | +7%  |
|   |   |  25.00 mg/L | +8%  |
|  Bilirubin (unconjugated) | 2 mg/dL | 5.00 mg/L | -5%  |
|   |   |  25.00 mg/L | 0%  |

The following substances do not interfere with the TRF method when present in urine at the concentrations indicated. Inaccuracies (biases) due to these substances are less than  $10\%$  at transferrin concentrations of  $0.72\mathrm{mg / dL}$  to  $2.38\mathrm{mg / dL}$  [7.22 mg/L to 23.83 mg/L].

|  Substance | Test Concentration | SI Units  |
| --- | --- | --- |
|  Acetone | 1000 mg/dL | 217 mmol/L  |
|  Ascorbic acid | 600 mg/dL | 27.2 mmol/L  |
|  Boric acid | 1000 mg/dL | 161.7 mmol/L  |
|  Bovine serum albumin | 500 mg/dL | 5 g/L  |
|  Creatinine | 500 mg/dL | 44.2 mmol/L  |
|  Ethanol | 1000 mg/dL | 217 mmol/L  |
|  Glucose | 2000 mg/dL | 111 mmol/L  |
|  Human serum albumin | 400 mg/dL | 4 g/L  |
|  Immunoglobulin G (IgG) | 100 mg/dL | 1 g/L  |
|  Oxalic acid | 10 mg/dL | 0.8 mmol/L  |
|  Riboflavin | 7.5 mg/dL | 200 μmol/L  |
|  Sodium azide | 1000 mg/dL | 153.8 mmol/L  |
|  Sodium fluoride | 900 mg/dL | 214.5 mmol/L  |
|  Urea | 6000 mg/dL | 1 mol/L  |

pH: Effect of pH on TRF-U was evaluated. Ten replicates of a urine sample were evaluated across a pH range 3 to 9. Sample bias was less than  $10\%$ .

{6}

Hook Effect:

The possibility of hook effect occurring when using the Dimension Vista® System TRF-U assay was evaluated for urine. Testing indicated no hook effect up to 663 mg/L for urine.

f. Assay cut-off:

Not applicable

2. Comparison studies:

a. Method comparison with predicate device:

Matched urine samples containing transferrin (sample concentration range from 2.0 mg/L to 24.4 mg/L) were tested with the Seimens TFR-U assay and predicate device following CLSI EP9-A2. A total of 63 urine samples were analyzed in singlicate (33 native ranging 2.0 to 24.4 mg/L, and 30 spiked ranging 10 to 20.7 mg/L). Passing-Bablok regression yielded the following statistics:

|  Comparative Method | Slope (95%CI) | Y-Intercept (mg/L) (95%CI) | Correlation Coefficient | n  |
| --- | --- | --- | --- | --- |
|  N Antisera to Human Transferrin on the BN ProSpec® | 0.983 (.950-1.013) | -0.00059 (-0.336 – 0.230) | 0.991 | 63  |

b. Matrix comparison:

Not applicable

3. Clinical studies:

a. Clinical Sensitivity:

Not applicable

b. Clinical specificity:

Not applicable

c. Other clinical supportive data (when a. and b. are not applicable):

Not applicable

4. Clinical cut-off:

Not applicable

5. Expected values/Reference range:

The concentration of transferrin in urine of healthy individuals is below the detection limit of detection for this method (less than 0.20 mg/dL [2.00 mg/L]) and is based on the following literature reference Rifai N, Gubar K, Silverman LM. Immunoturbidimetry: an attractive technique for the determination of urinary albumin and transferrin. Clin Biochem 1987; 20:179-81. This was confirmed by performing a reference interval transference study evaluating TRF-U levels in 20 apparently healthy adults.

N. Proposed Labeling:

The labeling is sufficient and it satisfies the requirements of 21 CFR Part 809.10.

O. Conclusion:

The submitted information in this premarket notification is complete and supports a substantial equivalence decision.

---

**Source:** [https://fda.innolitics.com/submissions/IM/subpart-f%E2%80%94immunological-test-systems/DDG/K081299](https://fda.innolitics.com/submissions/IM/subpart-f%E2%80%94immunological-test-systems/DDG/K081299)

**Published by [Innolitics](https://innolitics.com)** — a medical-device software consultancy. We help companies design, build, and clear FDA-regulated software and AI/ML devices. If you're preparing [a 510(k)](https://innolitics.com/services/510ks/), [a De Novo](https://innolitics.com/services/regulatory/), [a SaMD](https://innolitics.com/services/end-to-end-samd/), [an AI/ML medical device](https://innolitics.com/services/medical-imaging-ai-development/), or [an FDA regulatory strategy](https://innolitics.com/services/regulatory/), [get in touch](https://innolitics.com/contact).

**Cite:** Innolitics at https://innolitics.com