510(k) · Cleared
Clearedcobas Cdiff Nucleic acid test for use on the cobas Liat System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Roche Molecular Systems, Inc. · OZN C. Difficile Toxin Gene Amplification Assay
Cleared on Sep 12, 2017 as substantially equivalent to K142422 (Roche Molecular Systems, Inc., 2015) after a 90-day review. Its family tree reaches back 4 generations to 1993. 4 later devices descend from it.
- Decided
- Sep 12, 2017
- Review
- 90 days
- Class
- Class II
- Product code
- OZN
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 4 generations to K923463 (1993). 5 ancestors in all. 4 later devices descend from it, 2 citing it directly.
- Root · 4 generations backK923463 Clostridium Difficile Toxin/Antitoxin KitTechlab, Inc. · 1993
- 3 generations backK081920 BD Geneohm Cdiff AssayBd Diagnostics (Geneohm Sciences, Inc.) · 2008 · Recalled
- 2 generations backK130470 BD Max Cdiff Assay, BD Max InstrumentGeneohm Sciences Canada, Inc. (Bd Diagnostics) · 2013 · Recalled
- 1 generation backK142422 cobas Cdiff TestRoche Molecular Systems, Inc. · 2015
- This deviceK171770 cobas Cdiff Nucleic acid test for use on the cobas Liat SystemRoche Molecular Systems, Inc. · 2017
- Descendant · cites it directly · 2 of its ownK212427 cobas Cdiff nucleic acid test for use on the cobas Liat SystemRoche Molecular Systems, Inc. · 2021
- Descendant · 2 generations on · 0 of its ownK260045 cobas® Cdiff Nucleic acid test for use on the cobas® Liat® System…Roche Molecular Systems, Inc. · 2026
- Descendant · 2 generations on · 0 of its ownK243730 Xpert C. difficile/EpiCepheid® · 2025
- Descendant · cites it directly · 0 of its ownK210385 cobas Cdiff nucleic acid test for use on the cobas Liat SystemRoche Molecular Systems, Inc. · 2021
Most influential descendants
Showing 4 of 4 · See all- K212427cobas Cdiff nucleic acid test for use on the cobas Liat SystemRoche Molecular Systems, Inc. · 2021 · cites it directly2descendants
- K260045cobas® Cdiff Nucleic acid test for use on the cobas® Liat® System (07454945190); cobas®…Roche Molecular Systems, Inc. · 2026 · 2 generations on0descendants
- K243730Xpert C. difficile/EpiCepheid® · 2025 · 2 generations on0descendants
- K210385cobas Cdiff nucleic acid test for use on the cobas Liat SystemRoche Molecular Systems, Inc. · 2021 · cites it directly0descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −4 | K923463 | Clostridium Difficile Toxin/Antitoxin Kit | Techlab, Inc. | 1993 | — |
| −3 | K081920 | BD Geneohm Cdiff Assay | Bd Diagnostics (Geneohm Sciences, Inc.) | 2008 | 4 |
| −2 | K130470 | BD Max Cdiff Assay, BD Max Instrument | Geneohm Sciences Canada, Inc. (Bd Diagnostics) | 2013 | 2 |
| −1 | K142422 | cobas Cdiff Test | Roche Molecular Systems, Inc. | 2015 | — |
| 0 (this device) | K171770 | cobas Cdiff Nucleic acid test for use on the cobas Liat System | Roche Molecular Systems, Inc. | 2017 | — |
| +1 | K212427 | cobas Cdiff nucleic acid test for use on the cobas Liat System | Roche Molecular Systems, Inc. | 2021 | — |
| +2 | K260045 | cobas® Cdiff Nucleic acid test for use on the cobas® Liat® System… | Roche Molecular Systems, Inc. | 2026 | — |
| +2 | K243730 | Xpert C. difficile/Epi | Cepheid® | 2025 | — |
| +1 | K210385 | cobas Cdiff nucleic acid test for use on the cobas Liat System | Roche Molecular Systems, Inc. | 2021 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1994 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2021 | 2 | 0 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in OZN? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new OZN device
- #1 K260045 cobas® Cdiff Nucleic acid test for use on the…score 13.4 · 6 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K142422 | cobas Cdiff TestSummary page 7…est for use on the cobas ® ® on the cobas Liat System 4800 System , K142422 ® ® The cobas Cdiff N… | 2015 |
What descends from it? (4)
2 later devices cite it directly; ranked here by how many devices descend from each in turn.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 24 years and passes through 4 companies; a new generation was cleared every 4.3 years on median.
- 2 of the 5 ancestors have a recall of any class.
- Of its descendants, K212427 (Roche Molecular Systems, Inc., 2021) has gone furthest, with 2 descendants of its own.
How does its category compare?
All OZN devicesOZN C. Difficile Toxin Gene Amplification Assay: FDA decisions, review times, recalls and adverse event reports over 20 years. 2017, this device’s year, is highlighted.
FDA decisions per year · OZN
1in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · OZN
89in 2017
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · OZN
2in 2025
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · OZN
3in 2025
MAUDE reports naming product code OZN, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 0 | — | 0 | 0 |
| 2008 | 0 | — | 0 | 0 |
| 2009 | 0 | — | 0 | 0 |
| 2010 | 0 | — | 0 | 0 |
| 2011 | 0 | — | 0 | 0 |
| 2012 | 2 | — | 0 | 0 |
| 2013 | 4 | 79 | 0 | 0 |
| 2014 | 1 | — | 0 | 0 |
| 2015 | 1 | — | 0 | 0 |
| 2016 | 0 | — | 0 | 0 |
| 2017 | 5 | 89 | 0 | 0 |
| 2018 | 0 | — | 0 | 0 |
| 2019 | 0 | — | 0 | 0 |
| 2020 | 0 | — | 0 | 0 |
| 2021 | 2 | — | 0 | 5 |
| 2022 | 0 | — | 0 | 1 |
| 2023 | 1 | — | 0 | 2 |
| 2024 | 0 | — | 1 | 7 |
| 2025 | 1 | — | 2 | 3 |
| 2026 | 1 | — | 0 | — |
What is it indicated for?
The cobas® Cdiff Nucleic acid test for use on the cobas® Liat® System is an automated, qualitative in vitro diagnostic test, that utilizes real-time polymerase chain reaction (PCR), for the detection of the toxin B (tcdB) gene of toxigenic Clostridium difficile in unformed (liquid or soft) stool specimens obtained from patients suspected of having C. difficile infection (CDI). The cobas® Cdiff Nucleic acid test for use on the cobas® Liat® System is intended for use as an aid in the diagnosis of CDI in humans in conjunction with clinical and epidemiological risk factors.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K171770 · printed Nov 6, 2026
Cite this page
510(k) Report. “K171770: cobas Cdiff Nucleic acid test for use on the cobas Liat System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K171770
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026