(116 days)
None
Not Found
No
The summary describes a standard ELISA test kit and an automated processor for running the test. There is no mention of AI or ML in the intended use, device description, or performance studies. The automated processor likely automates steps like pipetting and reading, but not interpretation using AI/ML.
No
The device is an in vitro diagnostic (IVD) test kit used for the qualitative and quantitative determination of IgG antibodies, aiding in diagnosis and assessment of immune status rather than providing therapy.
Yes
The device aids in the diagnosis of primary or reactivated infection with Toxoplasma gondii by detecting IgG antibodies, and also helps assess the patient's immunological response and immune status.
No
The device described is a test kit (Enzyme Immunoassay) for detecting antibodies in human serum. It involves physical reagents and laboratory procedures, which are hardware components, even though it can be used with an automated processor. It is not solely software.
Yes, this device is an IVD (In Vitro Diagnostic).
Here's why:
- Intended Use: The intended use explicitly states that the device is for the "qualitative and quantitative determination of IgG antibodies in human serum to aid in the assessment of the patient's immunological response to infection with Toxoplasma gondii and in the determination of the immune status of individuals... The evaluation of acute and convalescent sera can aid in the diagnosis of primary or reactivated infection with Toxoplasma gondii." This clearly indicates that the device is intended to be used in vitro (outside the body) to examine specimens (human serum) to provide information for diagnostic purposes.
- Device Description: The device is described as an "enzyme-linked immunosorbent assay (ELISA) for the qualitative and quantitative detection of IgG to Toxoplasma gondii in human serum." ELISA is a common in vitro diagnostic technique.
- Specimen Type: The device uses "human serum," which is a biological specimen collected from the body for in vitro testing.
These points align directly with the definition of an In Vitro Diagnostic device.
N/A
Intended Use / Indications for Use
The assay is intended for use in detecting IgG antibodies to T. gondii antigen in human serum. The results of the assay can be used as an aid in the assessment of the patient's immunological response to infection with T. gondii and in the determination of immune status of individuals, including females of child-bearing age. The evaluation of paired sera can aid in the diagnosis of primary or reactivated infection.
The Diamedix Is-Toxoplasma IgG Test Kit is an Enzyme Immunoassay (EIA) for the qualitative and quantitative determination of IgG antibodies in human serum to aid in the assessment of the patient's immunological response to infection with Toxoplasma gondii and in the determination of the immune status of individuals, including females of child-bearing age. The evaluation of acute and convalescent sera can aid in the diagnosis of primary or reactivated infection with Toxoplasma gondii. These reagents can be used either manually or in conjunction with the MAGO® Plus Automated EIA Processor. This product is not FDA cleared for use in screening blood and plasma donors.
Product codes (comma separated list FDA assigned to the subject device)
LGD
Device Description
The Is-Toxoplasma IgG Test System is an enzyme-linked immunosorbent assay (ELISA) for the qualitative and quantitative detection of IgG to Toxoplasma gondii in human serum
Mentions image processing
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Mentions AI, DNN, or ML
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Input Imaging Modality
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Anatomical Site
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Indicated Patient Age Range
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Intended User / Care Setting
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Description of the training set, sample size, data source, and annotation protocol
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Description of the test set, sample size, data source, and annotation protocol
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Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
Comparison Testing:
A total of six hundred and twenty one sera were tested for the presence of toxoplasma IgG antibodies using the Diamedix Is-Toxoplasma IgG Test Kit and three other marketed tests at two independent sites (site #1, Miami, FL and site #2, Salt Lake City, Utah) as well as at Diamedix Corp., Miami, FL (site #3). At site #3 testing was performed both manually and using the MAGO Plus Automated EIA Processor.
Site #1 tested 200 samples (37% fresh and 73% frozen). Samples were obtained from the S. Florida area. Site #1 purposefully selected their sample population in order to provide an equal number of positive and negative results.
Site #2 tested 179 samples (all fresh) submitted for ToRCH screening. Samples were obtained from the West region.
Site #3 (Diamedix Corp.) tested 242 samples (all frozen) by the manual method and 241 of these samples (one being QNS) by the MAGO Plus method. Samples were obtained from S. Florida blood donors.
Correlation of Manual and MAGO Plus Results:
The results of 211 serum samples tested in the comparison studies were plotted to demonstrate the equivalence of the manual and MAGO Plus Procedures. Thirty highly reactive samples exceeded the reportable range and were excluded from this comparison. A scattergram and regression line of the results obtained with 95% confidence intervals is shown in Figure 1. Regression line: Y = 1.4991 + 1.0769 X, r = 0.9631.
Linearity:
Several strongly positive serum samples were serially diluted and assayed, in duplicate, in the Is-Toxoplasma IgG Test Kit both manually and using the MAGO Plus Automated EIA Processor. Representative linear regression graphs and scattergrams of the mean results with 95% confidence intervals are presented in Figures 2 and 3 for one patient sample. Figure 2 (Manual): slope of 993.54, y-intercept of -7.89, R-squared value of 0.9969. Figure 3 (MAGO Plus): slope of 865.69, y-intercept of -6.71, R-squared value of 0.9973. Results demonstrate a high degree of linearity throughout the reportable range.
Correlation to WHO Standard:
The Is-Toxoplasma IgG Test Kit has been calibrated against the WHO 3rd International Standard for Anti-Toxoplasma Serum (code TOXM). Several dilutions of the WHO Standard were prepared and assayed manually in triplicate in two different runs on two different days versus the Is-Toxoplasma IgG Test Kit standard curve. Linear regression graph and scattergram in Figure 4: Y = 4.3333 + 1.1946 X, R-squared value of 0.9932.
Quantitative Data:
Serum pairs were obtained by preparing multiple two-fold dilutions of several strongly positive sera. Ratios for dilutions representing a four-fold difference in antibody level were evaluated as a serum pair both manually and using the MAGO Plus. Overall, it was estimated that a 3.9 to 6.2 fold (mean 5.1 fold) increase in Is-Toxoplasma IgG IU/ml values corresponded to a four-fold titer increase in Toxoplasma IgG antibody levels.
Cross Reactivity:
Fifty sera negative for IgG antibodies to T. gondii in the Is-Toxoplasma IgG Test Kit as well as in another marketed test but positive for one or more viruses were evaluated. In addition, nine of these sera were positive for antinuclear antibodies (ANA) and two were positive for anti-DNA. The data in Table 5 suggest that no crossreactivity should be expected with the Is-Toxoplasma IgG Test Kit from these analytes (VZV IgG, HSV IgG, CMV IgG, Rubella IgG, EBV IgG, anti-DNA, ANA).
Precision:
Six serum samples, spanning the reportable range, as well as the 50 IU/ml kit Standard and kit Low Positive and Negative Controls were tested quantitatively and values calculated from IU/ml results. Sites #1 and #2 tested samples in triplicate in three separate runs on three different days. Site #3 (Diamedix Corp.) tested samples in triplicate in two separate runs on three different days both manually and using the MAGO Plus Automated EIA Processor. Results are shown in Tables 6-9 for Intra-Assay and Interassay Precision.
Expected Values:
Sera from 100 healthy South Florida donors (52 female and 48 male) were evaluated. Of the 100 samples, 22 (22%) were found to be positive and 78 (78%) were negative. Age distribution, geographic location and prevalence provided in Table 10.
Thirty-seven of the female donors were of child-bearing age (18-45 years). 2 (5%) were positive and 35 (95%) were negative.
A total of 45 sera from pregnant females (15 from each trimester) were also tested. 9 (20%) were positive and 36 (80%) were negative for anti-toxoplasma IgG.
A total of 216 samples from females of childbearing age were identified in the outside and in-house clinical studies (including the 45 pregnant females). 45 (21%) were positive and 171 (79%) were negative for anti-toxoplasma IgG.
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
Site #1:
Relative Sensitivity 98/112 = 87.5% (95% CI 81.4 - 93.6)
Relative Specificity 77/78 = 98.7% (95% CI 93.1 - 100.0)
Overall Agreement 175/190 = 92.1% (95% CI 87.3 - 95.5)
Site #2:
Relative Sensitivity 14/15 = 93.3% (95% CI 68.0 - 99.8)
Relative Specificity 164/164 = 100.0% (95% CI 97.8 - 100.0)
Overall Agreement 178/179 = 99.4% (95% CI 96.9 - 100.0)
Site #3 (Manual):
Relative Sensitivity 47/52 = 92.2% (95% CI 81.5-97.9)
Relative Specificity 186/187 = 99.5% (95% CI 97.1-100.0)
Overall Agreement 233/239 = 97.5% (95% CI 94.6-99.1)
Site #3 (MAGO Plus):
Relative Sensitivity 49/53 = 92.5% (95% CI 81.8-97.9)
Relative Specificity 185/186 = 99.5% (95% CI 97.0-100.0)
Overall Agreement 234/239 = 97.9% (95% CI 95.2-99.3)
Predicate Device(s): If the device was cleared using the 510(k) pathway, identify the Predicate Device(s) K/DEN number used to claim substantial equivalence and list them here in a comma separated list exactly as they appear in the text. List the primary predicate first in the list.
Incstar Toxoplasma IgG ELISA Kit
Reference Device(s): Identify the Reference Device(s) K/DEN number and list them here in a comma separated list exactly as they appear in the text.
Not Found
Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only (e.g. presence / absence, what scope was granted / cleared under the PCCP, any restrictions, etc).
Not Found
§ 866.3780
Toxoplasma gondii serological reagents.(a)
Identification. Toxoplasma gondii serological reagents are devices that consist of antigens and antisera used in serological tests to identify antibodies toToxoplasma gondii in serum. Additionally, some of these reagents consist of antisera conjugated with a fluorescent dye (immunofluorescent reagents) used to identifyToxoplasma gondii from clinical specimens. The identification aids in the diagnosis of toxoplasmosis caused by the parasitic protozoanToxoplasma gondii and provides epidemiological information on this disease. Congenital toxoplasmosis is characterized by lesions of the central nervous system, which if undetected and untreated may lead to brain defects, blindness, and death of an unborn fetus. The disease is characterized in children by inflammation of the brain and spinal cord.(b)
Classification. Class II (performance standards).
0
AUG 2 / 1998
510(k) Summary of Safety and Effectiveness
This summary of 510(k) safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR 807.92.
The assigned 510(k) number is:
Applicant Information:
| Date Prepared: | April 24, 1998 |
|---|---|
| Name: | Diamedix Corporation |
| Address: | 2140 N. Miami Avenue |
| Miami, FL 33127 |
| Contact Person: | Dr. Lynne Stirling |
|---|---|
| Phone Number: | 305-324-2354 |
| Fax Number: | 305-324-2585 |
Device Information:
| Trade Name: | Is-Toxoplasma IgG Test System |
|---|---|
| Common Name: | Toxoplasma gondii EIA Test |
| Classification Name: | Enzyme linked immunosorbent assay, Toxoplasma gondii |
| (866.3780) |
Equivalent Device:
Incstar Toxoplasma IgG ELISA Kit
Device Description: The Is-Toxoplasma IgG Test System is an enzyme-linked immunosorbent assay (ELISA) for the qualitative and quantitative detection of IgG to Toxoplasma gondii in human serum
Intended Use: The assay is intended for use in detecting IgG antibodies to T. gondii antigen in human serum. The results of the assay can be used as an aid in the assessment of the patient's immunological response to infection with T. gondii and in the determination of immune status of individuals, including females of child-bearing age. The evaluation of paired sera can aid in the diagnosis of primary or reactivated infection.
Principle of the Procedure: The Is-Toxoplasma IgG Test System is an enzyme-linked immunosorbent assay to detect IgG to Toxoplasma gondii in human serum. Partially purfied T. gondii antigens are attached to a solid phase microtiter well. Diluted test sera are added to each well. If antibodies which recognize the T. gondii antigens are present in the patient sample they will bind to the antigens on the well. After incubation, the wells are washed to remove unbound antibody. An enzyme labeled anti-human immunoglobulin (conjugate) is added to each test well. If antibody is present the enzyme-linked antibody will bind to it. After incubation, the wells are washed to remove unbound conjugate. A substrate solution is then added to each well. If enzyme is present from the prior step, the reaction is stopped and the color intensity is measured photometrically producing an indirect measure of the specific antibody present in the patient sample.
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SUMMARY OF SAFETY AND EFFECTIVENESS
Performance Characteristics
A. Comparison Testing
A total of six hundred and twenty one sera were tested for the presence of toxoplasma IgG antibodies using the Diamedix Is-Toxoplasma IgG Test Kit and three other marketed tests at two independent sites (site #1, Miami, FL and site #2, Salt Lake City, Utah) as well as at Diamedix Corp., Miami, FL (site #3). At site #3 testing was performed both manually and using the MAGO Plus Automated EIA Processor.
Site #1 tested 200 samples (37% fresh and 73% frozen). Samples were obtained from the S. Florida area. Site #1 purposefully selected their sample population in order to provide an equal number of positive and negative results. Table 1 compares the results obtained for the Is-Toxoplasma IgG Test Kit and their currently used testing method.
Site #2 tested 179 samples (all fresh) submitted for ToRCH screening. Samples were obtained from the West region. Table 2 compares the results obtained for the Is-Toxoplasma IgG Test Kit and their currently used testing method.
TABLE 1
Is-Toxoplasma IgG - Site #1
Is-Toxoplasma IgG - Site #2
Equivocal 0
0
0
95% CI* 68.0 - 99.8
97.8 - 100.0
96.9 - 100.0
| Positive | Negative | Equivocal | Positive | Negative | Equivocal | |||
|---|---|---|---|---|---|---|---|---|
| Other | ||||||||
| EIAs | Positive | 98 [23] | 14 [4] | 3 | Positive | 14 [6] | 1 | |
| Negative | 1 | 77 [29] | 0 | Negative | 0 | 164 [65] | ||
| Equivocal | 0 | 6 | 1 | Equivocal | 0 | 0 | ||
| Relative Sensitivity 98/112 = 87.5% | ||||||||
| Relative Specificity 77/78 = 98.7% | ||||||||
| Overall Agreement** 175/190 = 92.1% | Relative Sensitivity 14/15 = 93.3% | |||||||
| Relative Specificity 164/164 = 100.0% | ||||||||
| Overall Agreement** 178/179 = 99.4% | ||||||||
| 95% CI* | ||||||||
| 81.4 - 93.6 | ||||||||
| 93.1 - 100.0 | ||||||||
| 87.3 - 95.5 |
For Site #1, further resolution of the discordant samples was performed by testing such samples in a referee EIA method. Twelve of the samples negative by the Is-Toxoplasma IgG Test Kit and positive by the other EIA were negative by the referee method; the remaining two sera were equivocal. The sample that was positive in the Is-Toxoplasma IgG Test Kit and negative in the other EIA was negative when tested by the referee method.
For Site #2, further resolution of the discordant sample was performed in a similar manner. The sample that was negative in the Is-Toxoplasma IgG Test Kit and positive by the other EIA was negative in the referee EIA method.
Site #3 (Diamedix Corp.) tested 242 samples (all frozen) by the manual method and 241 of these samples (one being QNS) by the MAGO Plus method. Samples were obtained from S. Florida blood donors. Tables 3 and 4 compare the results obtained for the Is-Toxoplasma IgG Test Kit and another marketed EIA method.
| TABLE 3
Is-Toxoplasma IgG - Site #3 : Manual | | | | | TABLE 4
Is-Toxoplasma IgG - Site #3 : MAGO Plus | | | |
|--------------------------------------------------------|----------------------|-----------------|----------|----------------------|-----------------------------------------------------------|--------------------------------------|----------|----------------------|
| | | Positive | Negative | Equivocal | | Positive | Negative | Equivocal |
| Other
EIA | Positive | 47 [16] | 5 | 2 | Positive | 49 | 4 | 1 |
| | Negative | 1 | 186 [73] | 0 | Negative | 1 | 185 | 0 |
| | Equivocal | 0 | 1 | 0 | Equivocal | 0 | 1 | 0 |
| | Relative Sensitivity | 47/52 = 92.2% | | 95% CI*
81.5-97.9 | | Relative Sensitivity 49/53 = 92.5% | | 95% CI*
81.8-97.9 |
| | Relative Specificity | 186/187 = 99.5% | | 97.1-100.0 | | Relative Specificity 185/186 = 99.5% | | 97.0-100.0 |
| | Overall Agreement** | 233/239 = 97.5% | | 94.6-99.1 | | Overall Agreement** 234/239 = 97.9 % | | 95.2-99.3 |
[ ] denotes samples from females of child-bearing age.
- 95% Confidence Intervals (CI) calculated by the Exact Method.
** Equivocal results were excluded from calculations
2
For Site #3 (manual testing), further resolution of the discordant sera revealed that the 5 sera negative in the Is-Toxoplasma IgG Test Kit but positive in the other EIA were also negative by a referee EIA method. The serum that was positive in the Is-Toxoplasma IgG Test Kit and negative in the other EIA was positive by the referee method. For MAGO Plus testing, the 4 sera that were negative in the Is-Toxoplasma IgG Test Kit but positive in the other EIA were also negative by a referee EIA method. The serum that was positive in the Is-Toxoplasma IgG Test Kit and negative in the other EIA was positive by the referee method.
NOTE : Please be advised that 'relative' refers to the comparison of the assay's results to that of a similar assay. There was not an attempt to correlate the assay's results with disease presence or absence. No judgment can be comparison assay's accuracy to predict disease.
B. Correlation of Manual and MAGO Plus Results
The Is-Toxoplasma IgG Test Kit has been developed for automated as well as manual use. To demonstrate the equivalence of the manual and MAGO Plus Procedures, the results of 211 serum samples tested in the comparison studies were plotted. Thirty highly reactive samples exceeded the reportable range and were excluded from this comparison. A scattergram and regression line of the results obtained with 95% confidence intervals is shown in Figure 1.
Image /page/2/Figure/4 description: The image is a scatter plot titled "FIGURE 1: Manual vs MAGO Plus Correlation". The x-axis is labeled "MANUAL IU/ML" and ranges from 0 to 250. The y-axis is labeled "MAGO PLUS IU/ML" and ranges from -50 to 300. The plot shows a positive correlation between the two variables, with the equation of the regression line being Y = 1.4991 + 1.0769 X and r = 0.9631.
C. Linearity
Several strongly positive serum samples were serially dilutions were assayed, in duplicate, in the Is-Toxoplasma IgG Test Kit both manually and using the MAGO Plus Automated EIA Processor. Representative linear regression graphs and scattergrams of the mean results with 95% confidence intervals are presented in Figures 2 and 3 for one patient sample. The results demonstrate a high degree of linearity throughout the reportable range of the assay when samples are tested either manually or by MAGO Plus.
Image /page/2/Figure/7 description: The image contains two line graphs, the first titled "FIGURE 2: Manual Linearity" and the second titled "FIGURE 3: MAGO Plus Linearity". The first graph has a slope of 993.54, a y-intercept of -7.89, and an R-squared value of 0.9969. The second graph has a slope of 865.69, a y-intercept of -6.71, and an R-squared value of 0.9973.
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D. Correlation to WHO Standard
The Is-Toxoplasma IgG Test Kit has been calibrated against the WHO 3rd International Standard for Anti-Toxoplasma Serum (code TOXM). To demonstrate the accuracy of the quantitative procedure, several dilutions of the WHO Standard were prepared and assayed manually in triplicate in two different runs on two different days versus the Is-Toxoplasma IgG Test Kit standard curve. The linear regression graph and scattergram of the mean results with 95% Confidence Intervals is shown in Figure 4.
FIGURE 4 : Dilutions of WHO Standard
Image /page/3/Figure/2 description: The image is a graph titled 'assayed against Is-Toxoplasma IgG Standards'. The x-axis is labeled 'WHO IU/ML' and ranges from 0 to 250. The y-axis is labeled 'Is-Toxoplasma IU/ml' and ranges from 0 to 350. The graph shows a linear relationship with the equation Y = 4.3333 + 1.1946 X and an R-squared value of 0.9932.
E. Quantitative Data
Serum pairs were obtained by preparing multiple two-fold dilutions of several strongly positive sera. Ratios for dilutions representing a four-fold difference in antibody level were evaluated as a serum pair both manually and using the MAGO Plus. Overall, it was estimated that a 3.9 to 6.2 fold (mean 5.1 fold ) increase in Is-Toxoplasma IgG IU/ml values corresponded to a four-fold titer increase in Toxoplasma IgG antibody levels.
F. Cross Reactivity
Sera containing IgG antibodies to viruses potentially cross-reactive to T. gondit have been tested in the Is-Toxoplasma IgG Test Kit. Fifty sera negative for IgG antibodies to 7. gondii in the Is-Toxoplasma IgG Test Kit as well as in another marketed test but positive for one or more vinuses were evaluated. In additon, nine of these sera were positive for antinuclear antibodies (ANA) and two were positive for anti-DNA. The data in the following table suggest that no crossreactivity should be expected with the Is-Toxoplasma IgG Test Kit from these analytes.
| Analyte | Toxoplasma IgG | VZV IgG | HSV IgG | CMV IgG | Rubella IgG | EBV IgG | anti-DNA | ANA |
|---|---|---|---|---|---|---|---|---|
| No.of Pos. Samples | 0 | 48 | 47 | 37 | 49 | 48 | 2 | 9 |
TABLE 5
4
G. Precision
Six serum samples, spanning the reportable range, as well as the 50 IU/ml kit Standard and kit Low Positive and Negative Ontrols were tested quantitatively and values calculated from IU/ml results. Sites #1 and #2 tested samples in triplicate in three separate runs on three different days. Site #3 (Diamedix Corp.) tested samples in triplicate in two separate runs on three different days both manually and using the MAGO Plus Automated EIA Processor. The results obtained are shown in Tables 6-9.
| SERUM | INTRA-ASSAY DAY 1 | INTRA-ASSAY DAY 2 | INTRA-ASSAY DAY 3 | INTERASSAY (n=9) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN IU/ml | SD | CV% | MEAN IU/ml | SD | CV% | MEAN IU/ml | SD | CV% | MEAN IU/ml | SD | CV% | |
| A | 7.9 | 1.35 | 17.09 | 8.2 | 2.05 | 25.00 | 7.9 | 2.36 | 29.87 | 8.0 | 1.71 | 21.38 |
| B | 31.3 | 1.40 | 4.47 | 30.7 | 1.46 | 4.76 | 26.2 | 2.90 | 11.07 | 29.4 | 3.00 | 10.20 |
| C | 159.7 | 4.51 | 2.82 | 173.6 | 5.21 | 3.00 | 147.2 | 7.01 | 4.76 | 160.2 | 12.45 | 7.77 |
| D | 170.8 | 13.32 | 7.80 | 177.4 | 14.38 | 8.11 | 165.4 | 29.49 | 17.83 | 171.2 | 18.45 | 10.78 |
| E | 274.7 | 28.55 | 10.39 | 259.1 | 23.31 | 9.00 | 257.1 | 14.66 | 5.70 | 263.6 | 21.52 | 8.16 |
| F | 83.1 | 10.28 | 12.37 | 89.6 | 12.94 | 14.44 | 81.1 | 19.90 | 24.54 | 84.6 | 13.50 | 15.96 |
| 50 STD | 54.6 | 4.46 | 8.17 | 54.9 | 5.60 | 10.20 | 53.5 | 8.35 | 15.61 | 54.3 | 5.53 | 10.18 |
| LPC | 128.1 | 1.56 | 1.22 | 138.1 | 3.15 | 2.28 | 146.4 | 18.42 | 12.58 | 137.7 | 12.16 | 8.83 |
| NC | 13.2 | 0.40 | 3.03 | 12.9 | 0.51 | 3.95 | 15.7 | 1.65 | 10.51 | 13.9 | 1.58 | 11.37 |
TABLE 6 : Site #1 - Intra-Assay and Interassay Precision
TABLE 7 : Site #2 - Intra-Assay and Interassay Precision
| SERUM | INTRA-ASSAY DAY 1 | INTRA-ASSAY DAY 2 | INTRA-ASSAY DAY 3 | INTERASSAY (n=9) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | ||||||||||||
| IU/ml | SD | CV% | MEAN | |||||||||
| IU/ml | SD | CV% | MEAN | |||||||||
| IU/ml | SD | CV% | MEAN | |||||||||
| IU/ml | SD | CV% | ||||||||||
| A | 10.1 | 1.46 | 14.46 | 5.4 | 1.03 | 19.07 | 1.1 | 1.47 | 133.60 | 5.5 | 4.07 | 74.00 |
| B | 25.9 | 3.56 | 13.75 | 25.0 | 2.79 | 11.16 | 21.0 | 1.15 | 5.48 | 24.0 | 3.25 | 13.54 |
| C | 145.1 | 8.32 | 5.73 | 136.3 | 5.15 | 3.78 | 70.3 | 4.79 | 6.81 | 117.2 | 35.83 | 30.57 |
| D | 162.8 | 8.92 | 5.48 | 132.9 | 3.70 | 2.78 | 95.1 | 2.96 | 3.11 | 130.3 | 29.81 | 22.88 |
| E | 250.0 | 0.00 | 0.00 | 237.9 | 9.96 | 4.19 | 189.2 | 8.92 | 4.71 | 225.7 | 28.68 | 12.71 |
| F | 56.8 | 6.61 | 11.64 | 75.5 | 2.76 | 3.66 | 31.0 | 3.80 | 12.26 | 54.5 | 19.77 | 36.28 |
| 50 STD | 48.7 | 6.57 | 13.49 | 51.7 | 3.79 | 7.33 | 41.8 | 0.76 | 1.82 | 47.4 | 5.82 | 12.28 |
| LPC | 134.9 | 19.60 | 14.53 | 123.1 | 11.22 | 9.11 | 123.1 | 11.22 | 9.11 | 127.0 | 13.92 | 10.96 |
| NC | 11.8 | 1.68 | 14.24 | 11.5 | 1.93 | 16.78 | 11.5 | 1.93 | 16.78 | 11.6 | 1.61 | 13.88 |
TABLE 8 : Site #3-Intra-Assay and Interassay Precision (Manual)
| SERUM | INTRA-ASSAY DAY 1 | INTRA-ASSAY DAY 2 | INTRA-ASSAY DAY 3 | INTERASSAY (n=18) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | ||||||||||||
| IU/ml | SD | CV% | MEAN | |||||||||
| IU/ml | SD | CV% | MEAN | |||||||||
| IU/ml | SD | CV% | MEAN | |||||||||
| IU/ml | SD | CV% | ||||||||||
| A | 2.6 | 1.51 | 58.08 | 1.9 | 0.44 | 23.16 | 2.4 | 0.70 | 29.17 | 2.3 | 0.98 | 42.61 |
| B | 17.4 | 2.08 | 11.95 | 19.3 | 2.28 | 11.81 | 19.2 | 1.41 | 7.34 | 18.7 | 2.04 | 10.91 |
| C | 115.3 | 8.59 | 7.45 | 105.6 | 9.88 | 9.36 | 105.6 | 22.04 | 20.87 | 108.8 | 14.69 | 13.50 |
| D | 141.6 | 5.54 | 3.91 | 141.6 | 6.90 | 4.87 | 137.7 | 10.86 | 7.89 | 140.3 | 7.82 | 5.57 |
| E | 238.7 | 20.56 | 8.61 | 246.8 | 16.69 | 6.76 | 240.7 | 19.48 | 8.09 | 242.1 | 18.17 | 7.51 |
| F | 55.1 | 5.21 | 9.46 | 46.3 | 1.62 | 3.50 | 58.0 | 8.22 | 14.17 | 53.3 | 7.32 | 13.73 |
| 50 STD | 56.7 | 8.12 | 14.32 | 55.4 | 8.99 | 16.23 | 57.3 | 3.53 | 6.16 | 56.5 | 6.89 | 12.19 |
| LPC | 138.8 | 10.99 | 7.92 | 139.0 | 8.07 | 5.81 | 148.6 | 8.29 | 5.58 | 142.1 | 9.87 | 6.95 |
| NC | 14.1 | 0.96 | 6.81 | 12.9 | 1.21 | 9.38 | 15.4 | 2.09 | 13.57 | 14.1 | 1.76 | 12.48 |
TABLE 9 : Site #3- Intra-assay and Interassay Precision (MAGO Plus)
| SERUM | INTRA-ASSAY DAY 1 | INTRA-ASSAY DAY 2 | INTRA-ASSAY DAY 3 | INTERASSAY (n=18) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN IU/ml | SD | CV% | MEAN IU/ml | SD | CV% | MEAN IU/ml | SD | CV% | MEAN IU/ml | SD | CV% | ||||||
| A | 2.0 | 1.54 | 77.00 | 2.0 | 2.60 | 130.00 | 3.9 | 1.89 | 48.46 | 2.6 | 2.15 | 82.69 | |||||
| B | 17.9 | 2.34 | 13.07 | 12.3 | 8.70 | 70.73 | 20.3 | 6.22 | 30.64 | 16.8 | 6.87 | 40.89 | |||||
| C | 150.0 | 5.99 | 3.99 | 154.3 | 5.07 | 3.29 | 156.6 | 20.31 | 12.97 | 153.6 | 12.14 | 7.90 | |||||
| D | 149.5 | 20.43 | 13.67 | 163.8 | 19.35 | 11.81 | 181.6 | 16.15 | 8.89 | 165.0 | 22.19 | 13.45 | |||||
| E | >250 | N/A | N/A | >250 | N/A | N/A | >250 | N/A | N/A | >250 | N/A | N/A | |||||
| G | 40.9 | 1.95 | 4.77 | 40.4 | 2.42 | 5.99 | 41.8 | 2.65 | 6.34 | 41.0 | 2.30 | 5.61 | |||||
| 50 STD | 65.7 | 4.24 | 6.45 | 79.2 | 10.45 | 13.19 | 78.4 | 9.35 | 11.93 | 74.4 | 10.19 | 13.70 | |||||
| LPC | 170.9 | 11.34 | 6.64 | 195.8 | 8.83 | 4.51 | 208.8 | 15.98 | 7.65 | 191.8 | 19.94 | 10.40 | |||||
| NC | 15.8 | 2.18 | 13.80 | 15.1 | 4.82 | 31.92 | 24.8 | 3.52 | 14.19 | 18.5 | 5.70 | 30.81 |
5
Expected Values
The prevalence of Toxoplasma IgG antibodies in the normal population can vary depending on a number of factors such as age, geographical location, socio-economic status, race and type of test used. It has been esttimated that in the United States 8-20% of the normal population has anti-toxoplasma IgG antibodies ( 1). For finales of child-bearing age and for pregnant females prevalence rates from 16 to 50% have been reported (3).
In the present studies sera from 100 healthy South Florida donors (52 female and 48 male) were evaluated in the Is-Toxoplasma IgG Test Kit. Of the 100 samples, 22 (22%) were found to be positive and 78 (78%) were negative. Age distribution, geographic location and prevalence is provided in Table 10. Histograms demonstrating the distribution of IU/ml values are shown in Figures 5 and 6.
Thirty-seven of the female donors were of child-bearing age (18-45 years). Of the sera from these donors, 2 (5%) were positive and 35 (95%) were negative. A total of 45 sera from pregnant females (15 from each trimester) were also tested in the Is-Toxoplasma IgG Test Kit. Nine (20%) were positive and 36 (80%) were negative for anti-toxoplasma IgG. In addition, a total of 216 samples from females of childbearing age were identified in the outside and in-house clinical studies (these included the 45 sera from pregnant females already referenced). Of these samples, 45 (21%) were positive and 171 (79%) were negative for anti-toxoplasma IgG when evaluated in the Is-Toxoplasma IgG Test Kit.
| Number of donors | Prevalence | |
|---|---|---|
| Total Number | 100 | 22% |
| Geographic | ||
| location : | ||
| South Eastern US | 100 | 22% |
| Age | ||
| 10-19 | 13 | 15.4% |
| 20-29 | 23 | 17.4% |
| 30-39 | 40 | 17.5% |
| 40-49 | 13 | 15.4% |
| 50-59 | 5 | 40.0% |
| 60-69 | 6 | 83.0% |
TABLE 10
Image /page/5/Figure/6 description: The image contains two bar charts, labeled as "FIGURE 5" and "FIGURE 6", which display the frequency of Is-Toxoplasma IgG positive and negative populations, respectively. In Figure 5, the x-axis represents IU/mL values, and the y-axis represents frequency, with the >250 IU/mL category having the highest frequency at approximately 14. In Figure 6, the x-axis also represents IU/mL values, and the y-axis represents frequency, with the 0-10 IU/mL category having the highest frequency at approximately 75.
6
Image /page/6/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo is circular, with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter. In the center of the circle is an abstract symbol that resembles an eagle or bird in flight, composed of three curved lines.
Food and Drug Administration 2098 Gaither Road Rockville MD 20850
AUG 21 1998
Lynne Stirling, Ph.D. Vice President, Regulatory Affairs Diamedix Corporation 2140 N. Miami Ave. Miami. FL 33127
Re: K981498
Trade Name: Is-Toxoplasma IgG Test System Regulatory Class: II Product Code: LGD Dated: June 23, 1998 Received: June 25, 1998
Dear Dr. Stirling:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
7
Page 2
Under the Clinical Laboratory Improvement Amendments of 1988 (CLIA-88), this device may require a CLIA complexity categorization. To determine if it does, you should contact the Centers for Disease Control and Prevention (CDC) at (770)488-7655.
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4588. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll free number (800) 638-2041 or at (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html"
Sincerely yours.
Steven Sutman
Steven I. Gutman, M.D., M.B.A. Director Division of Clinical Laboratory Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
8
Appendix G. Indications for Use Statement
INDICATIONS FOR USE STATEMENT
510(K) NUMBER : _ K 98 14 98
DEVICE NAME : Is-Toxoplasma IgG Test System
Indications for Use : The Diamedix Is-Toxoplasma IgG Test Kit is an Enzyme Immunoassay (EIA) for the qualitative and quantitative determination of IgG antibodies in human serum to aid in the assessment of the patient's immunological response to infection with Toxoplasma gondii and in the determination of the immune status of individuals, including females of child-bearing age. The evaluation of acute and convalescent sera can aid in the diagnosis of primary or reactivated infection with Toxoplasma gondii. These reagents can be used either manually or in conjunction with the MAGO® Plus Automated EIA Processor. This product is not FDA cleared for use in screening blood and plasma donors.
Woody Dubois
510(k) Number
000253