DIP/U.S. Urine Analysis Test System

K173327 · Healthy.Io, Ltd. · JIL · Jul 18, 2018 · Clinical Chemistry

Device Facts

• Record ID: K173327
• Device Name: DIP/U.S. Urine Analysis Test System
• Applicant: Healthy.Io, Ltd.
• Product Code: JIL · Clinical Chemistry
• Decision Date: Jul 18, 2018
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 862.1340
• Device Class: Class 2
• Attributes: Software as a Medical Device

Indications for Use

The DIP | U.S. Urine Analysis Test System consists of a smartphone application, a proprietary Color-Board, and Urinalysis Reagent Strips. It is intended for the semi-quantitative detection of the following analytes in urine: Glucose. Specific Gravity, Blood, pH and Protein, as well as the qualitative detection of Nitrite, The DIP | U.S. Urine Analysis Test System is intended for prescription home-use only, with results provided directly to the physician. The results can be used to guide patient management and care, and aid in the diagnosis and monitoring of metabolic or systemic diseases that affect kidney function and endocrine disorders. Physician interpretation of the results should be made in conjunction with the patient's other clinical information to determine if further confirmatory tests or consultations are necessary. Patients do not have access to the results at any point in the process.

Device Story

System uses smartphone camera to capture images of urinalysis reagent strips placed on proprietary Color-Board; app processes images via cloud-based server to determine analyte concentrations based on colorimetric reflectance; results transmitted directly to physician for clinical decision-making. Intended for prescription home-use; patient performs test using midstream urine; app guides user through process, enforces image capture boundaries (distance, angle, lighting), and prevents user access to results. Benefits include remote monitoring of kidney/endocrine health without immediate lab visit.

Clinical Evidence

Two method comparison studies (n=429 and n=250) compared lay-user results from the subject device against laboratory professional results using the predicate. Results showed >99% agreement (±1 color block) for all analytes. Usability studies showed >99% success rate in test completion and positive user feedback. Analytical testing included precision (repeatability/reproducibility), interference, limit of detection, linearity, and stability, all meeting performance requirements.

Technological Characteristics

System components: smartphone (LG Nexus 5), proprietary Color-Board, and ACON Mission Urinalysis Reagent Strips (K061559). Sensing principle: reflectance-based colorimetric analysis. Connectivity: smartphone app with cloud-based server processing. Software: image analysis algorithm for color block detection. Sterilization: N/A (reagent strips are commercially available).

Indications for Use

Indicated for prescription home-use for semi-quantitative detection of urine glucose, specific gravity, blood, pH, and protein, and qualitative detection of nitrite. Aids in diagnosis/monitoring of metabolic or systemic diseases affecting kidney function and endocrine disorders. Results provided directly to physicians for clinical decision-making.

Regulatory Classification

Identification

A urinary glucose (nonquantitative) test system is a device intended to measure glucosuria (glucose in urine). Urinary glucose (nonquantitative) measurements are used in the diagnosis and treatment of carbohydrate metabolism disorders including diabetes mellitus, hypoglycemia, and hyperglycemia.

Predicate Devices

• ACON Mission U500 Urinalysis System (K111221)

Submission Summary (Full Text)

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# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY ASSAY AND INSTRUMENT COMBINATION TEMPLATE

A. 510(k) Number:
k173327

B. Purpose for Submission:
New device

C. Measurand:
Measurement of the following in urine samples: glucose, blood, protein, pH, specific gravity, and nitrite

D. Type of Test:
Qualitative and semi-quantitative urinalysis

E. Applicant:
Healthy.io, Ltd.

F. Proprietary and Established Names:
DIP | U.S. Urine Analysis Test System

G. Regulatory Information:

1. Regulation section:

| Name | Regulation | Product Code | Device Class |
| --- | --- | --- | --- |
| Urinary Glucose (non-quantitative) test system | 21 CFR §862.1340 | JIL | II |
| Occult blood test | 21 CFR §864.6550 | JIO | II |
| Urinary pH (non-quantitative) test | 21 CFR §862.1550 | CEN | I |
| Urinary protein or albumin (non-quantitative) test system | 21 CFR §862.1645 | JIR | I |
| Refractometer for clinical use | 21 CFR §862.2800 | JRE | I |

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| Name | Regulation | Product Code | Device Class |
| --- | --- | --- | --- |
| Nitrite (non-quantitative) test system | 21 CFR §862.1510 | JMT | I |

2. Panel:

Chemistry (75), Hematology (81)

H. Intended Use:

1. Intended use(s):

See Indication(s) for use below.

2. Indication(s) for use:

The DIP | U.S. Urine Analysis Test System consists of a smartphone application, a proprietary Color-Board, and Urinalysis Reagent Strips. It is intended for the semi-quantitative detection of the following analytes in urine: Glucose, Specific Gravity, Blood, pH and Protein, as well as the qualitative detection of Nitrite.

The DIP | U.S. Urine Analysis Test System is intended for prescription home-use only, with results provided directly to the physician. The results can be used to guide patient management and care, and aid in the diagnosis and monitoring of metabolic or systemic diseases that affect kidney function and endocrine disorders. Physician interpretation of the results should be made in conjunction with the patient's other clinical information to determine if further confirmatory tests or consultations are necessary. Patients do not have access to the results at any point in the process.

3. Special conditions for use statement(s):

For prescription home use only.

For in vitro diagnostic use only.

4. Special instrument requirements:

LG Nexus 5

I. Device Description:

The DIP | U.S. Urine Analysis Test System is comprised of the following components:

1. Urine Receptacle
2. A single, individually-wrapped Mission Urinalysis Reagent Strip U031-101 (ACON Laboratories Inc., K061559)
3. Color-Board

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4. Smartphone App
5. Back-end, cloud-based server
6. User Manual

# J. Substantial Equivalence Information:

1. Predicate device name(s):

ACON Mission U500 Urinalysis System

2. Predicate $510(\mathbf{k})$ number(s):

K111221

3. Comparison with predicate:

| Similarities |
| --- |
| Item | Subject Device k173327 DIP | U.S. Urine Analysis Test System | Predicate Device K111221 ACON Mission U500 Urinalysis System |
| Intended Use | For the in vitro measurement of urine chemistry analytes. | Same |
| Sample Type | Human urine | Same |
| Measurement Principle | Reflectance | Same |
| Differences |
| --- |
| Item | Subject Device k173327 DIP | U.S. Urine Analysis Test System | Predicate Device K111221 ACON Mission U500 Urinalysis System |
| Reader | LG Nexus 5 | The Mission U500 Urine Analyzer |
| Analytes | Glucose, Protein, pH, Blood, Nitrites, Specific Gravity | Glucose, Protein, pH, Blood, Nitrites, Specific Gravity Bilirubin, Urobilinogen, Ketones, Leukocytes, |

# K. Standard/Guidance Document Referenced (if applicable):

Clinical and Laboratory Standards Institute (CLSI) EP05-A3

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Evaluation of Precision of Quantitative Measurement Procedures.

- CLSI EP06-A Evaluation of the Linearity of Quantitative Measurement Procedures: A Statistical Approach.
- CLSI EP07-A2 Interference Testing in Clinical Chemistry.
- CLSI EP17-A2 Evaluation of Detection Capability for Clinical Laboratory Measurement Procedures; Approved Guideline- Second Edition.

L. Test Principle:

Glucose: This test is based on the enzymatic reaction that occurs between glucose oxidase, peroxidase and chromogen. Glucose is first oxidized to produce gluconic acid and hydrogen peroxide in the presence of glucose oxidase. The hydrogen peroxide reacts with potassium iodide chromogen in the presence of peroxidase. The extent to which the chromogen is oxidized determines the color which is produced, ranging from green to brown.

Protein: This test is based on the protein-error-of-indicators reaction. At a constant pH, the presence of protein causes a change in the color of the indicator to a cyan color.

pH: This test is based on a double indicator system which gives a broad range of colors covering the entire urinary pH range. Colors range from orange to yellow and green to blue.

Specific Gravity: This test is based on the apparent pKa change of certain pretreated polyelectrolytes in relation to ionic concentration. In the presence of an indicator, colors range from deep blue-green in urine of low ionic concentration to green and yellow-green in urine of increasing ionic concentration.

Blood: This test is based on the peroxidase-like activity of hemoglobin which catalyzes the reaction of cumene-hydroperoxide and 3,3',5,5'-tetramethylbenzidine. The resulting color ranges from orange to green to dark blue.

Nitrites: This test is based on the Griess reaction. Nitrite reacts with sulfanilamide, followed by a diazo-coupling reaction to form a pink colored product.

The strip is scanned and analyzed using the mobile device running the app. The results are then sent directly to the prescriber.

M. Performance Characteristics (if/when applicable):

1. Analytical performance:

a. Precision/Reproducibility:

The Repeatability study was conducted at 3 sites. Each site had one user performing the tests using one Nexus phone, 3 lots of strips and 20 replicates/lot. Two levels of

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urine controls were tested, the results are summarized in the tables below by site. A total of 3 phones (Nexus 5) were tested across 3 different sites by 3 different users $(N = 180)$ .

Repeatability-Urine Level 1 - Negative

| Analyte | level | Within Run % Agreement (Exact match) site 1 | Within Run % Agreement (Exact match) site 2 | Within Run % Agreement (Exact match) site 3 | % Agreement (+/- 1 Color Block) | N Total |
| --- | --- | --- | --- | --- | --- | --- |
| Nitrite | Negative | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Protein | Negative | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| pH | 6.0 | 98.3% (59/60) | 96.7% (58/60) | 100% (60/60) | 100% (180/180) | 180 |
| Blood | Negative | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Specific Gravity | 1.01 | 96.7% (58/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Glucose | Negative | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |

Repeatability-Urine Level 2 - High-Positive

| Analyte | Level | Within Run %Agreement (Exact match) site 1 | Within Run %Agreement (Exact match) site 2 | Within Run %Agreement (Exact match) site 3 | % Agreement (+/- 1 Color Block) | N (Total) |
| --- | --- | --- | --- | --- | --- | --- |
| Nitrite | Positive | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Protein | 300 mg/dL | 100% (60/60) | 83.3%* (50/60) | 98.3% (59/60) | 100% (180/180) | 180 |
| pH | 8.0 | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Blood | 200 Ery/μl | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Specific Gravity | 1.03 | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |
| Glucose | 1000 mg/dL | 100% (60/60) | 100% (60/60) | 100% (60/60) | 100% (180/180) | 180 |

* For the protein high positive control (300mg/dL), 83.3% of the results were 3+, 16.7% of the results were 2+.

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The reproducibility study was conducted at three sites. Each site had one user performing the tests, using one phone, and 3 lots of strips. Three levels of urine controls were tested, with 1 replicate per run, two runs a day (morning and afternoon), for 20 days. A total of 3 Nexus 5 phones were used across the sites by 3 different users (N= 1 replicate x2 runs x 3 lots x 1 phone x20 days x3 operators/sites=360). The results are summarized in the below table.

| Sample | Negative | | Low positive | | High positive | |
| --- | --- | --- | --- | --- | --- | --- |
| | % Agreement within same block | % Agreement within +/- 1 block | % Agreement within same block | % Agreement within +/- 1 block | % Agreement within same block | % Agreement within +/- 1 block |
| Nitrite | 100% (360/360) | 100% (360/360) | 100% (360/360) | 100% (360/360) | 100% (360/360) | 100% (360/360) |
| Protein | 100% (360/360) | 100% (360/360) | 99.4% (358/360) | 100% (360/360) | 88.3%* (318/360) | 100% (360/360) |
| pH | 94.4% (340/360) | 100% (360/360) | 99.4% (358/360) | 100% (360/360) | 98.6% (355/360) | 100% (360/360) |
| Blood | 100% (360/360) | 100% (360/360) | 97.2% (350/360) | 100% (360/360) | 100% (360/360) | 100% (360/360) |
| Specific Gravity | 98.9% (356/360) | 100% (360/360) | 99.2% (357/360) | 100% (360/360) | 100% (360/360) | 100% (360/360) |
| Glucose | 99.7% (359/360) | 100% (360/360) | 98.9% (356/360) | 100% (360/360) | 100% (360/360) | 100% (360/360) |

* For the protein high positive control (300mg/dL), 88.3% of the results were 3+, 11.7% of the results were 2+.

# b. Linearity/assay reportable range:

The reportable range for each analyte was evaluated by measuring negative urine samples spiked with commercially available reagents. The concentrations were confirmed by the predicate device before being tested using the candidate device. Samples were measured by 3 operators, each operator used one phone, 3 lots of test strips in replicates of 10, for a total of 90 measurements per sample.

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| Nitrite | | | | |
| --- | --- | --- | --- | --- |
| Output | Block Cut-off | Expected Concentration | % Exact Match | % Within 1 color block |
| Negative | 0 mg/dL | 0-0.03 mg/dL | 100 | 100 |
| Positive | 0.1 mg/dL | 0.055-0.1 mg/dL | 100 | 100 |
| pH | | | | |
| --- | --- | --- | --- | --- |
| Output | Block Cut-off | Expected Concentration | % Exact Match | % Within 1 color block |
| 5 | 5 | 5-5.2 | 98.89 | 100 |
| 5.5 | 5.5 | 5.4-5.6 | 100 | 100 |
| 6 | 6 | 5.8-6 | 100 | 100 |
| 6.5 | 6.5 | 6.4-6.6 | 100 | 100 |
| 7 | 7 | 6.8-7.2 | 90 | 100 |
| 7.5 | 7.5 | 7.4-7.6 | 100 | 100 |
| 8 | 8 | 7.8-8.2 | 100 | 100 |
| 8.5 | 8 | 8.4-8.6 | 100 | 100 |
| 9 | 9 | 8.8-9 | 100 | 100 |
| Protein | | | | |
| --- | --- | --- | --- | --- |
| Output | Block Cut-off | Expected Concentration | % Exact Match | % Within 1 color block |
| Negative | 0 mg/dL | 0-11 mg/dL | 100 | 100 |
| Trace | 15 mg/dL | 13-20 mg/dL | 97.78 | 100 |
| 1+ | 30 mg/dL | 23-65 mg/dL | 100 | 100 |
| 2+ | 100 mg/dL | 81-156 mg/dL | 93.33 | 100 |
| 3+ | 300 mg/dL | >192 mg/dL | 100 | 100 |
| Specific Gravity | | | | |
| --- | --- | --- | --- | --- |
| Output | Block Cut-off | Expected Concentration | % Exact Match | % Within 1 color block |
| 1.000 | 1.000 | 1.000 | 98.89 | 100 |
| 1.005 | 1.005 | 1.002-1.006 | 100 | 100 |
| 1.010 | 1.010 | 1.008-1.010 | 97.78 | 100 |
| 1.015 | 1.015 | 1.014-1.016 | 92.22 | 100 |
| 1.020 | 1.020 | 1.018-1.02 | 98.89 | 100 |
| 1.025 | 1.025 | 1.024-1.026 | 100 | 100 |
| 1.030 | 1.030 | 1.028-1.03 | 100 | 100 |

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| Blood | | | | |
| --- | --- | --- | --- | --- |
| Output | Block Cut-off | Expected Concentration | % Exact Match | % Within 1 color block |
| Negative | 0 Ery/μL | 0-4 Ery/μL | 100 | 100 |
| Trace | 10 Ery/μL | 8-16 Ery/μL | 92.22 | 100 |
| 1+ | 25 Ery/μL | 22-47 Ery/μL | 94.44 | 100 |
| 2+ | 80 Ery/μL | 69-128 Ery/μL | 100 | 100 |
| 3+ | 200 Ery/μL | 176-240 Ery/μL | 100 | 100 |
| Glucose | | | | |
| --- | --- | --- | --- | --- |
| Output | Block Cut-off | Expected Concentration | % Exact Match | % Within 1 color block |
| Negative | 0 mg/dL | 0-40 mg/dL | 100 | 100 |
| Trace | 100 mg/dL | 80-160 mg/dL | 97.78 | 100 |
| 1+ | 250 mg/dL | 220-350 mg/dL | 100 | 100 |
| 2+ | 500 mg/dL | 450-700 mg/dL | 97.78 | 100 |
| 3+ | 1000 mg/dL | 900-1400 mg/dL | 100 | 100 |

c. Traceability, Stability, Expected values (controls, calibrators, or methods):

Traceability:

The sponsor did not describe any degree of traceability for the device.

d. Detection limit:

The sponsor validated the Limit of Detection by testing spiked or diluted urine samples with analyte concentrations just below, at, and above each cutoff for each color block. For pH and specific gravity, the sponsor determined the detection limits for the first two color blocks (i.e., 5.0 to 5.5 and 5.5 to 6.0 for pH and 1.000 to 1.005 and 1.005 to 1.010 for specific gravity). Each sample was tested in 6 replicates/per reagents test strip lot, using 3 lot of test strips (n=18), and one Nexus 5 phone. The Limit of Detection for each color block was defined as the lowest concentration at which at least 55% of the samples were positive. The results are summarized below: limits of detection are presented in the tables below:

| Analyte | Negative to Trace | Trace to 1+ | 1+ to 2+ | 2+ to 3+ |
| --- | --- | --- | --- | --- |
| Blood | 6 Ery/ uL | 19 Ery/ uL | 58 Ery/ uL | 152 Ery/ uL |
| Glucose | 60 mg / dL | 190 mg / dL | 400 mg / dL | 800 mg / dL |
| Protein | 12 mg / dL | 24 mg / dL | 72 mg / dL | 180 mg / dL |

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The results of the linearity and detection limit studies support the following range of values claimed by the sponsor:

| Parameter (abbreviation) | Qualitative units | Semi-quantitative units |
| --- | --- | --- |
| Nitrite (NIT) | - | Neg |
| | + | Pos |
| Protein (PRO) | - | Neg |
| | ± | 15mg/dL |
| | 1+ | 30mg/dL |
| | 2+ | 100mg/dL |
| | 3+ | 300mg/dL |
| pH | 5.0 | 5.0 |
| | 5.5 | 5.5 |
| | 6.0 | 6.0 |
| | 6.5 | 6.5 |
| | 7.0 | 7.0 |
| | 7.5 | 7.5 |
| | 8.0 | 8.0 |
| | 8.5 | 8.5 |
| Blood (BLO) | - | Neg |
| | ± | 10 Ery/μL |
| | 1+ | 25 Ery/μL |
| | 2+ | 80 Ery/μL |
| | 3+ | 200 Ery/μL |
| Specific Gravity (SG) | 1.005 | 1.005 |
| | 1.010 | 1.010 |
| | 1.015 | 1.015 |
| | 1.020 | 1.020 |
| | 1.025 | 1.025 |
| | 1.030 | 1.030 |

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| Parameter (abbreviation) | Qualitative units | Semi-quantitative units |
| --- | --- | --- |
| Glucose (GLU) | - | Neg |
| | ± | 100 mg/dL |
| | 1+ | 250 mg/dL |
| | 2+ | 500 mg/dL |
| | 3+ | 1000 mg/dL |

# e. Analytical specificity:

Urine samples (negative, low positive, high positive) were spiked with potential interferents at low and high concentrations as recommended by CLSI-EP7. The spiked samples were compared to a control sample without the interferents, and interference was defined as a change in output of more than 1 color block between spiked and unspiked (control) samples. When interference was detected, further testing was conducted to identify the concentration at which interference was not observed. Each sample was tested using 2 lots of urine dip stick, 2 replicates per lot, using Nexus 5 phone.

The interferents and the highest concentrations tested are listed in the table below:

| Interferent | Highest Concentration Tested (mg/dL) |
| --- | --- |
| Acetoacetic Acid | 250 |
| Albumin | 1250 |
| Ammonium Chloride | 500 |
| Ascorbic Acid | 200 |
| Unconjugated Bilirubin | 85 |
| Calcium Chloride | 275 |
| Citric Acid | 75 |
| Creatine | 10 |
| Creatinine | 300 |
| Fructose | 100 |
| Galactose | 80 |
| Glycine | 450 |
| Glucose | 1250 |
| Lactose | 10 |

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| Interferent | Highest Concentration Tested (mg/dL) |
| --- | --- |
| Hemoglobin | 550 |
| KCl | 1500 |
| NaCl | 2750 |
| Oxalic Acid | 70 |
| Phenolphthalein | 300 |
| Riboflavin | 10 |
| Sodium Bicarbonate | 375 |
| Sodium Nitrate | 10 |
| Sodium Nitrite | 10 |
| Sodium Phosphate | 500 |
| Theophylline | 100 |
| Urea | 2000 |
| Sodium Mercaptoethane (MESNA) | 530 |

The following table shows the substances which interfered with the subject device. Results are expressed as the lowest concentration of the interfering substance that exhibited interference and the resulting change in output of the color block (number of color block change and negative or positive change indicated in parentheses). These interferences are described in the physician compendium available only to the prescriber.

| Analyte | Concentration of Substance at which interference was observed | Change in Color Output |
| --- | --- | --- |
| Nitrite | Unconjugated Bilirubin (≥ 6.3 mg/dL) Hemoglobin (≥ 178 mg/dL) | False Positive Results (+2) |
| Protein | Unconjugated Bilirubin (≥ 27.6 mg/dL) | False Negative Results (-2) |
| | Hemoglobin (≥ 20.6 mg/dL) | False Positive Results (+2) |

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| Analyte | Concentration of Substance at which interference was observed | Change in Color Output |
| --- | --- | --- |
| Blood | MESNA (≥13.25 mg/dL) Unconjugated Bilirubin (≥75.44 mg/dL) Sodium Phosphate (≥275 mg/dL) | False Positive Results (+2) |
| pH | Oxalic Acid (≥38.5 mg/dL) Calcium Chloride (≥151.25 mg/dL) Citric Acid (≥41.25 mg/dL) Ascorbic Acid (≥87.5 mg/dL) Sodium Chloride (≥2131.25 mg/dL) | False Negative Results (-2) |
| | Sodium Bicarbonate (≥164 mg/dL) Sodium Phosphate (≥218 mg/dL) | False Positive Results (+2) |
| SG | Sodium Bicarbonate (≥375 mg/dL) Sodium Phosphate (≥500 mg/dL) | False Negative Results (-2) |
| | Oxalic Acid (≥70 mg/dL) Potassium Chloride (≥487 mg/dL) Calcium Chloride (≥182 mg/dL) Hemoglobin (≥550 mg/dL) Albumin (≥1250 mg/dL) Sodium Chloride (≥2131.25 mg/dL) | False Positive Results (+2) |
| Glucose | Ascorbic Acid (≥200 mg/dL) | False Negative Results (-2) |

The following statements are provided in the lay user labeling:

# Factors That May Interfere With the Test Results

Note: Some substances (i.e. medications, vitamins, and dietary supplements) may change the color of urine and interfere with the reactions on the dipstick, making the test results unreliable. These substances may include, for example: Ascorbic Acid (vitamin C), Riboflavin (vitamin B2), Phenazopyridine (Pyridium), Rifampin (Rifadin), Nitrofurantoin (Furadantin). Do not take the test if you are menstruating. If you have any questions or concerns consult your healthcare provider before performing the test.

f. Assay cut-off:

Not applicable.

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# 2. Comparison studies:

# a. Method comparison with predicate device:

The first study enrolled 429 subjects from two U.S. clinical sites. The number of spiked samples did not exceed $15\%$ for each analyte for all bins combined. Subjects including males and females, all ethnicities, ranging from 18-80 years of age participated in the study. LG Nexus 5 phones were used to perform the study. Samples were analyzed comparing the results obtained by subject using the DIP | U.S. device and results of aliquots of the same samples measured by a laboratory professional using the predicate (ACON Mission U500 Urine Analyzer). Each sample was tested once using the candidate device, three times on the ACON 500 analyzer, and the most common result was used in the comparison. The results are summarized in the tables below.

Nitrite

| Dip | U.S. | | Predicate | |
| --- | --- | --- | --- | --- |
| | | Negative | Positive | Total |
| Negative | Count | 250 | 1 | 251 |
| Positive | Count | 3 | 30 | 33 |
| Total | Count | 253 | 31 | 284 |
| | %Exact Match | 98.8% | 96.8% | 98.59% |
| | % +/- 1 color block | 100% | 100% | 100% |

Protein

| Dip | U.S | | | | | Predicate | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| | | Negative | Trace | 1+ | 2+ | 3+ | Total |
| Neg | Count | 156 | 8 | | | | 164 |
| Trace | Count | 18 | 52 | 2 | | | 72 |
| 1+ | Count | 1 | 7 | 13 | 6 | | 27 |
| 2+ | Count | | | | 10 | | 10 |
| 3+ | Count | | | | | 11 | 11 |
| Total | Count | 175 | 67 | 15 | 16 | 11 | 284 |
| | %Exact Match | 89.1% | 77.6% | 86.7% | 62.5% | 100% | 85.21% |
| | % +/- 1 color block | 99.4% | 100% | 100% | 100% | 100% | 99.65% |

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pH

| Dip | U.S. | | | | | | | | Predicate | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | 5.0 | 5.5 | 6.0 | 6.5 | 7.0 | 7.5 | 8.0 | 8.5 | Total |
| 5.0 | Count | 1 | 2 | | | | | | | 3 |
| 5.5 | Count | 3 | 48 | 13 | | | | | | 64 |
| 6.0 | Count | | 6 | 81 | 18 | 1 | | | | 106 |
| 6.5 | Count | | | | 27 | 8 | | | | 35 |
| 7.0 | Count | | | | | 45 | 1 | 3 | | 49 |
| 7.5 | Count | | | | | 4 | 4 | 8 | | 16 |
| 8.0 | Count | | | | | | 1 | 4 | | 5 |
| 8.5 | Count | | | | | | | | 5 | 6 |
| Total | Count | 4 | 56 | 94 | 45 | 58 | 6 | 15 | 5 | 284 |
| | %Exact Match | 25% | 85.7% | 86.2% | 60% | 77.6% | 66.7% | 26.7% | 100% | 75.7% |
| | % +/- 1 color block | 100% | 100% | 100% | 100% | 98.2% | 100% | 80% | 100% | 98.59%* |

*One sample that read as pH of 9 using the comparator method read as pH of 8.5 using the candidate method.

Specific Gravity

| Dip | U.S. | | | | | | Predicate | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | 1.005 | 1.01 | 1.015 | 1.02 | 1.025 | 1.03 | Total |
| 1.005 | Count | 13 | 2 | | | | | 15 |
| 1.01 | Count | 19 | 28 | 5 | | | | 52 |
| 1.015 | Count | 3 | 6 | 24 | 8 | | | 41 |
| 1.02 | Count | | 1 | 10 | 63 | 13 | | 87 |
| 1.025 | Count | | | | 12 | 26 | 21 | 59 |
| 1.03 | Count | | | | | 4 | 26 | 30 |
| Total | Count | 35 | 37 | 39 | 83 | 43 | 47 | 284 |
| | %Exact Match | 37.1% | 75.7% | 61.5% | 75.9% | 60.5% | 55.3% | 63.38% |
| | % +/- 1 color block | 91.4% | 97.3% | 100% | 100% | 100% | 100% | 98.59% |

In a second study, 250 subjects who met the eligibility requirements were recruited from one clinical site to evaluate the accuracy of blood and glucose using the same

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protocol as in the first study. A total of 289 samples were tested (250 neat samples and 39 spiked samples), and the results are summarized below:

Blood

| Dip | U.S. | | | | | Predicate | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| | | Negative | Trace | 1+ | 2+ | 3+ | Total |
| Negative | Count | 181 | | | | | 181 |
| Trace | Count | 13 | 23 | 2 | | | 38 |
| 1+ | Count | | 3 | 30 | | | 33 |
| 2+ | Count | | | 4 | 11 | 3 | 18 |
| 3+ | Count | | | | | 19 | 19 |
| Total | Count | 194 | 26 | 36 | 11 | 22 | 289 |
| | %Exact Match | 93.3% | 88.5% | 83.3% | 100.0% | 86.4% | 91.35% |
| | % +/- 1 Color block | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |

Glucose

| Dip | U.S. | | | | | Predicate | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| | | Negative | Trace | 1+ | 2+ | 3+ | Total |
| Negative | Count | 192 | | | | | 192 |
| Trace | Count | 10 | 25 | | | 1 | 36 |
| 1+ | Count | | 7 | 6 | 1 | | 14 |
| 2+ | Count | | | | 9 | 7 | 16 |
| 3+ | Count | | | | 4 | 27 | 31 |
| Total | Count | 202 | 32 | 6 | 14 | 35 | 289 |
| | %Exact Match | 95.0% | 78.1% | 100.0% | 64.3% | 77.1% | 89.62% |
| | % +/- 1 color block | 100.0% | 100.0% | 100.0% | 100.0% | 97.14% | 99.65% |

Usability:

Usability was evaluated in the 429 subjects who conducted the test for the first time – using native urine samples. 417 subjects (representing 97% of the total study participants) completed the test on their first try with no usability issues. Seven other subjects encountered challenges in using the device and performing the test within the designated 2-minute time frame. These subjects followed the Application Instructions and asked to re-do the test using a new kit. Each of these seven subjects successfully completed the test on their second try (increasing the number of subjects who were able to successfully complete the test to 424, representing a 99% usability success rate). Five subjects, representing 1% of the total study participants, failed to perform

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the study and were unable to send out their test results. Subjects also filled out usability evaluations surveys to rank different aspects of the product's usability. 99% of the users reported that the it was easy or very easy (4 or 5 rating) to use the product.

b. Matrix comparison:

Not applicable. This device is for testing with human urine only.

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 patient does not receive test results from this test. The test results are sent to the prescriber. The following information about expected values is provided in the Physician Compendium which is available only to the prescriber.

Reference ranges:

| Analyte | Expected Value |
| --- | --- |
| Glucose | Negative |
| Protein | Negative or trace |
| pH | 4.6-8.0 |
| Blood | Negative |
| Nitrite | Negative |
| Specific Gravity | 1.001-1.035 |

Literature references are provided to support the stated reference ranges.

1. Brunzel, N.A. Fundamentals of Urine and Body Fluid Analysis. 2nd ed. Philadelphia:

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Saunders. 2004.

2. Free, A. H., et al. Clinical Chemistry, 1957; 3: 716
3. Henry, J.B. et al. Clinical Diagnosis and Management of Laboratory Methods, 21st ed. Philadelphia: Saunders; 2007.
4. Tietz Fundamentals of Clinical Chemistry, 4th ed. Philadelphia: Saunders. 1996.

## N. Instrument Name:

LG Nexus 5

## O. System Descriptions:

1. Modes of Operation:

Does the applicant’s device contain the ability to transmit data to a computer, webserver, or mobile device?

Yes ☐ X ☐ or No ☐

Does the applicant’s device transmit data to a computer, webserver, or mobile device using wireless transmission?

Yes ☐ X ☐ or No ☐

2. Software:

FDA has reviewed applicant’s Hazard Analysis and software development processes for this line of product types:

Yes ☐ X ☐ or No ☐

3. Specimen Identification:

The app will instruct the user to enter the patient ID using the keypad of the cell phone.

4. Specimen Sampling and Handling:

The test is performed using midstream urine sample collected in a cup.

5. Calibration:

Calibration is not needed.

6. Quality Control:

The app has internal controls designed to account for environmental conditions that

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impact the accuracy of the test.

P. Other Supportive Instrument Performance Characteristics Data Not Covered In The "Performance Characteristics" Section above:

1. The Color-Board and cup components were tested under various conditions (e.g., temperature, humidity) and shown to meet color and elasticity specifications for the Color-Board and cup, respectively. The study protocol and acceptance criteria were reviewed and found acceptable.

2. To assess potential carry-over a study was performed testing the effect of holding the test strips up and down for 15, 30, 60, 90 and 110 seconds, respectively, after dipping. The sponsor used positive and negative controls in the testing. Results of the negative control showed no carry-over. The results using the positive control indicated that after holding the stick in the up position for 30 seconds the pH measurements started to decrease. The instructions for use, both in the App and in the user manual, clearly describe the proper handling of the strip to prevent carry-over. The user is instructed to place the stick immediately on the Color-Board without delay.

3. To validate the recommended dipping time and to evaluate the impact of different dipping times on the test results, the sponsor conducted a study using negative and positive controls. None of the results were impacted by dipping times ranging from 1- to 5-seconds. The user is instructed to dip the strip in the urine for 1 second.

4. The sponsor conducted an assay time study in order to validate the recommended timeframe (from dipping to scanning the strip) and to evaluate the impact of different timeframes on the test results. The sponsor performed this study using negative and positive controls. Through the app-based flow, the user is instructed to scan the stick after 60 seconds have elapsed since dipping the stick. The sponsor tested time intervals at 60, 75, 90, and 110 seconds. None of the results were significantly impacted by the different timeframes evaluated.

5. Lighting study: The lighting study was done in a light chamber, simulating the five most popular types of light sources – GLS, Fluorescent, CFL, halogen and LED. The sponsor tested the effect of lighting using both the color sticks (five different printed stick configurations that covered 27 possible values on the reportable range) and urine samples (negative and positive urine samples), and tested them under 10 different lighting conditions that included: CFL6000K, CFL T2, CFL2700K, LED 2700K, LED 6000K, LED 6500K, Incandescent, Halogen, Fluorescent 2700K, Fluorescent 6000K. None of the results were impacted by the different lighting conditions evaluated.

6. Boundary study: The sponsor performed a study to demonstrate the environmental boundaries that would prevent accurate dipstick scanning by a lay user. If the distance is too far or too close, if the angle is too acute or obtuse, or the light is too dark, the DIP | U.S. algorithm will not permit the smartphone to capture an image. This study was performed using positive and negative urine samples and different printed sticks designed

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to mimic test strips with different test results. At all boundary conditions evaluated, the test results were not significantly impacted.

**Q. Proposed Labeling:**

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

**R. Conclusion:**

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

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