510(k) · Cleared
ClearedN-Assay CPK-L
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Crestat Diagnostics, Inc. · CGS Nad Reduction/Nadh Oxidation, Cpk Or Isoenzymes
Cleared on Mar 26, 1998 as substantially equivalent to K781719 (Medical Analysis Systems, Inc., 1978) after a 16-day review. Its family tree reaches back 1 generation to 1978.
- Decided
- Mar 26, 1998
- Review
- 16 days
- Class
- Class II
- Product code
- CGS
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 1 generation to K781719 (1978). No later device cites it as a predicate yet.
- Root · 1 generation backK781719 CPK Reagent Set, Nad ReductionMedical Analysis Systems, Inc. · 1978
- This deviceK980900 N-Assay CPK-LCrestat Diagnostics, Inc. · 1998
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −1 | K781719 | CPK Reagent Set, Nad Reduction | Medical Analysis Systems, Inc. | 1978 | — |
| 0 (this device) | K980900 | N-Assay CPK-L | Crestat Diagnostics, Inc. | 1998 | — |
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 CGS? 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 CGS device
- #1 K191296 Pointe Scientific Creatinine Kinase (CK)…score -0.2 · 1 generation · no Class I recall
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 |
|---|---|---|---|
| * | K781719 | CPK Reagent Set, Nad ReductionSummary page 2…he safety and effectiveness of the liquid Crestat N-ASSAY CPK-L Reagent is demonstrated by its substantial equivalence to the Medical Analysis Systems CK liquid reagent (K781719) which is based on a similar method. Both test systems are intended to quantitatively measure CPK in human serum. In comparison… | 1978 |
What descends from it?
No later submission names this one as a predicate yet.
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?
- Its one ancestor has no recall.
How does its category compare?
All CGS devicesCGS Nad Reduction/Nadh Oxidation, Cpk Or Isoenzymes: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · CGS
1in 2020
2026 to Oct 25, outlined.
Median 510(k) review, days · CGS
Too few CGS 510(k)s in any year since 2007 to give a median.
Recalls per year · CGS
1in 2025
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · CGS
2in 2025
MAUDE reports naming product code CGS, 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 | 1 | — | 1 | 64 |
| 2008 | 2 | — | 0 | 0 |
| 2009 | 1 | — | 0 | 0 |
| 2010 | 0 | — | 0 | 1 |
| 2011 | 1 | — | 0 | 3 |
| 2012 | 0 | — | 0 | 0 |
| 2013 | 1 | — | 0 | 0 |
| 2014 | 0 | — | 0 | 0 |
| 2015 | 0 | — | 0 | 0 |
| 2016 | 1 | — | 0 | 0 |
| 2017 | 0 | — | 0 | 2 |
| 2018 | 0 | — | 0 | 1,434 |
| 2019 | 1 | — | 0 | 4 |
| 2020 | 1 | — | 0 | 0 |
| 2021 | 0 | — | 0 | 0 |
| 2022 | 0 | — | 0 | 1 |
| 2023 | 0 | — | 0 | 0 |
| 2024 | 0 | — | 0 | 1 |
| 2025 | 0 | — | 1 | 2 |
| 2026 | 0 | — | 0 | — |
What is it indicated for?
The intended use for the N-ASSAY CPK-L Reagent is for the quantitative determination of serum creatine phosphokinase (CPK) activity in human serum in the diagnosis and treatment of myocardial infarction and muscle diseases such as muscular dystrophy.
Indications for use read by OCR from a scanned FDA summary, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K980900 · printed Nov 4, 2026
Cite this page
510(k) Report. “K980900: N-Assay CPK-L.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 4, 2026. https://510kreport.com/device/K980900
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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