VITROS Chemistry Products Mg Slides For in vitro diagnostic use only. VITROS Mg Slides quantitatively measure magnesium (Mg) concentration in serum, plasma, and urine. VITROS Calibrator Kit 1 For in vitro diagnostic use only. VITROS Calibrator Kit 1 is intended for use in calibration of the VITROS Chemistry Systems for the quantitative measurement of BUN/ UREA, Ca, CREA, GLU, LAC, Li, Mg, PHOS, SALI, THEO, and URIC.
Device Story
VITROS Chemistry Products Mg Slides are dry, multilayered analytical elements used with VITROS Chemistry Systems (analyzers) to measure magnesium concentration in serum, plasma, and urine. The system accepts body fluid specimens; the slide performs a quantitative chemical reaction within its layers. The principle of operation is reflectance spectrophotometry. The device is used in clinical laboratory settings by trained personnel. The system provides automated quantitative results to healthcare providers, assisting in the diagnosis and management of conditions related to magnesium imbalance, such as renal failure, malnutrition, or metabolic disorders. The modified slide uses a reduced sample volume (5 µL) and adjusted reactive ingredient quantities compared to the predicate, while maintaining the same analytical principle and performance characteristics.
Clinical Evidence
Bench testing only. Equivalence was demonstrated using manufactured slides tested with patient and quality control samples spanning the assay range. No clinical trials were required as the modification involved slide chemistry and sample volume parameters on an established, cleared platform.
Technological Characteristics
Dry, multilayered slide analytical element. Sensing principle: reflectance spectrophotometry. Reactive ingredients: 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (calcium chelator) and 1,5-bis(2-hydroxy-3,5-dichlorophenyl)-3-cyanoformazan (dye). Sample volume: 5 µL. Incubation: ~5 minutes at 37°C. Compatible with VITROS 250, 500, 750, and 950 Series Analyzers. Connectivity: System-integrated. Sterilization: Not applicable.
Indications for Use
Indicated for in vitro diagnostic quantitative measurement of magnesium concentration in serum, plasma, and urine for patients requiring assessment of magnesium levels, including those with suspected deficiency or excess associated with conditions like renal failure, alcoholism, malnutrition, or tetany.
Regulatory Classification
Identification
A calibrator is a device intended for medical purposes for use in a test system to establish points of reference that are used in the determination of values in the measurement of substances in human specimens. (See also § 862.2 in this part.)
Special Controls
*Classification.* Class II (special controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 862.9.
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# DEC 1 0 2002
## Summary Information
## 510(k) Summary
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: KC23876
- Ortho-Clinical Diagnostics, Inc. 1. Submitter 100 Indigo Creek Drive name, Rochester, New York 14626-5101 address, contact (585) 453-4041
Contact Person: Marlene A. Hanna
- Date Special 510(k) prepared: November 20, 2002 2. Preparatio n date
- Trade or Proprietary Name: 3. Device VITROS Chemistry Products Mg Slides name VITROS Chemistry Products Calibrator Kit 1 Common Name Classification Name: Magnesium test system ( 21 CFR 862.1495).
- The VITROS Chemistry Products Mg Slides (modified) and VITROS 4. Predicate device Chemistry Products Calibrator Kit 1 are substantially equivalent to the VITROS Chemistry Products Mg Slides (current slide) and VITROS Chemistry Products Calibrator Kit 1.
Continued on next page
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### 510(k) Summary, Continued
- The VITROS Chemistry System uses Vitros Slides to perform discrete 5. Device chemistry tests on body fluid specimens. All reactions necessary for a single description quantitative measurement take place within the multi-layered analytical element of a Vitros Slide. The system is comprised of two main elements: 1. The VITROS Chemistry Products range of chemistry products (in this case VITROS Chemistry Products Mg Slides, VITROS Chemistry Products Calibrator Kit 1, which are combined by the VITROS Chemistry System to perform the VITROS Mg test. 2. The VITROS Chemistry System - instrumentation, which provides automated use of the chemistry slides. Multiple VITROS Chemistry Systems were cleared for market by separate 510(k) pre-market notifications (K890928, K890929, K922072, K946090 and K922072). The VITROS Chemistry System and Calibrators are dedicated specifically for use only with the VITROS Chemistry Products range of products. 6. Device VITROS Mg Slides intended For in vitro diagnostic use only. VITROS Mg Slides quantitatively measure Magnesium (MG) concentration use in serum, plasma, and urine. VITROS Calibrator Kit 1 For in vitro diagnostic use only. VITROS Calibrator Kit 1 is intended for use in calibration of the VITROS Chemistry Systems for the quantitative measurement of BUN/UREA. Ca. CREA, GLU, LAC, Li, Mg, PHOS, SALI, THEO, and URIC. Continued on next page
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- The VITROS Chemistry Products Mg Slide (modified) and VITROS 7. Comparison Chemistry Products Calibrator Kit 1 are substantially equivalent to VITROS to Chemistry Products Mg Slide and VITROS Chemistry Products Calibrator Kit predicate 1 that were cleared by the FDA for in vitro diagnostic use. device Mg Slide: (K861386, Cleared August 26, 1986) Calibrator Kit 1: (K001885 Cleared July 20, 2000)
Table 1 lists the characteristics of the tests performed using the VITROS Mg Slide (modified) and the VITROS Mg Slide (current).
| Device<br>Characteristic | New Device<br>VITROS Mg Slide<br>(Modified) | Predicate Device<br>VITROS Mg Slide<br>(Current) |
|-------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Sample volume | 5 µL | 10 µL |
| Quantity of<br>Reactive<br>Ingredients per<br>slide (test) | 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-<br>tetraacetic acid (calcium chelator) 272.1 µg<br>and<br>1,5-bis(2-hydroxy-3,5-dichlorophenyl)-3-<br>cyanoformazan (dye) 46.19 µg | 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-<br>tetraacetic acid (calcium chelator) 542.3 µg and<br>1,5-bis(2-hydroxy-3,5-dichlorophenyl)-3-<br>cyanoformazan (dye) 92.06 µg |
| Concentrations<br>of Slide<br>Reactive<br>Ingredients per<br>cm-squared | No Change. | 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-<br>tetraacetic acid (calcium chelator) 302.3 µg and<br>1,5-bis(2-hydroxy-3,5-dichlorophenyl)-3-<br>cyanoformazan (dye) 51.32 µg |
| Intended Use | No change. | For in vitro diagnostic use only.<br>VITROS Mg Slides quantitatively measure<br>magnesium (Mg) concentration in serum,<br>plasma and urine. |
| Basic principle | No Change. | Dry, multilayered slide utilizing reflectance<br>spectrophotometry |
| Sample type | No Change. | Serum , plasma , urine |
| Reportable<br>Range | | |
| Serum,Plasma: | No Change. | 0.20 - 10.00 mg/ dL |
| Urine: | No Change. | 1.20 - 60.00 mg/dL (after multiplying by a 6X<br>dilution factor) |
| Instrumentation | No Change. | VITROS 250, 500, 750 and 950 Series<br>Analyzers |
| Incubation time<br>and temperature | No Change. | Approximately 5 minutes at 37°C |
Table 1 List of Slide Characteristics: Comparison to Predicate Device
Continued on next page
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## 510(k) Summary, Continued
#### The information presented in the pre-market notification demonstrates that 8. Conclusions the performance of the VITROS Mg Slides (modified) for use with human serum, plasma, and urine is substantially equivalent to the cleared predicate device.
Equivalence was demonstrated using manufactured slides along with patient and quality control samples with measured Magnesium values spanning the assay range.
The information presented in the premarket notification provides a reasonable assurance that the VITROS Mg Slides (modified) for use with human serum, plasma, and urine is safe and effective for the stated intended use.
{4}------------------------------------------------
## DEPARTMENT OF HEALTH & HUMAN SERVICES
Image /page/4/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 top half of the circle. Inside the circle is a stylized image of an eagle or bird-like figure, represented by three curved lines.
Food and Drug Administration 2098 Gaither Road Rockville MD 20850
# DEC 1 0 2002
Ms. Marlene A. Hanna Regulatory Affairs Associate Ortho-Clinical Diagnostics, Inc. 100 Indigo Creek Drive Rochester, New York 14626-5101
k023876 Re:
> Trade/Device Name: VITROS Chemistry Products Mg Slides/ VITROS Chemistry Products Calibrator Kit 1
Regulation Number: 21 CFR § 862.1150 Regulation Name: Calibrator Regulatory Class: II Product Code: JIX; JGJ Dated: November 20, 2002 Received: November 21, 2002
Dear Ms. Hanna:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and 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) that do not require approval of a premarket approval application (PMA). 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 (PMA), it may be subject to such additional controls. Existing major regulations affecting your device can be found in Title 21, Code of Federal Regulations (CFR), Parts 800 to 895. In addition, FDA may publish further announcements concerning your device in the Federal Register.
{5}------------------------------------------------
#### Page 2
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Parts 801 and 809); and good manufacturing practice requirements as set forth in the quality systems (OS) regulation (21 CFR Part 820). This letter will allow you to begin marketing your device as described in your Section 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 information about the application of labeling requirements to your device, or questions on the promotion and advertising of your device, please contact the Office of In Vitro Diagnostic Device Evaluation and Safety at (301) 594-3084. Also, please note the regulation entitled. "Misbranding by reference to premarket notification" (21CFR Part 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html.
Sincerely yours,
Steven Sutman
Steven I. Gutman, M.D., M.B. Director Office of In Vitro Diagnostic Device Evaluation and Safety Center for Devices and Radiological Health
Enclosure
{6}------------------------------------------------
| Statement of Intended Use | |
|----------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| | Page 1 of 1 |
| 510(k) Number (if known): | K023876 |
| Device Name: | VITROS Chemistry Products Mg Slides<br>VITROS Chemistry Products Calibrator Kit 1 |
| Intended Use: | VITROS Chemistry Products Mg Slides<br>For in vitro diagnostic use only.<br>VITROS Mg Slides quantitatively measure magnesium (Mg) concentration in serum, plasma, and urine. |
| | VITROS Calibrator Kit 1<br>For in vitro diagnostic use only.<br>VITROS Calibrator Kit 1 is intended for use in calibration of the<br>VITROS Chemistry Systems for the quantitative measurement of<br>BUN/ UREA, Ca, CREA, GLU, LAC, Li, Mg, PHOS, SALI, THEO, and URIC. |
| Summary and Explanation of Test: | Magnesium is predominantly an intracellular cation and is essential in enzyme reactions. Magnesium deficiency may cause weakness, tremors, tetany, and convulsions. Hypomagnesemia is associated with hypocalcemia, alcoholism, some types of malnutrition, chronic hemodialysis, and pregnancy. Increased serum magnesium concentrations occur in patients with renal failure, dehydration, and Addison's disease. <sup>1</sup> |
## (PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
| | Carol C Benson for Jean Cooper |
|---------------------|--------------------------------|
| (Division Sign-Off) | |
| Division | Clinical Laboratory Devices |
| 510(k) Number | K023876 |
| Prescription Use | <div style="text-align:center;">X</div> | OR | Over-The-Counter Use |
|----------------------|-----------------------------------------|----|--------------------------|
| (Per 21 CFR 801.109) | | | (Optional Format 1-2-96) |
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Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
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Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.