510(k) · Cleared
ClearedCoulter AC.T Diff Analyzer
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Coulter Corp. · GKZ Counter, Differential Cell
Cleared on Oct 29, 1997 as substantially equivalent to K964988 (Coulter Corp., 1997) and 1 other predicate after a 35-day review. Its family tree reaches back 2 generations to 1982. 4 later devices descend from it.
- Decided
- Oct 29, 1997
- Review
- 35 days
- Class
- Class II
- Product code
- GKZ
- Recalls
- None
- Predicates
- 2
Its longest line of descent runs back 2 generations to K823355 (1982). 4 later devices descend from it, 1 citing it directly.
- Root · 2 generations backK823355 Coulter-Counter #S Plus IV & Lyse S +DCoulter Electronics, Inc. · 1982
- 1 generation backK964988 Coulter AC.T Series AnalyzerCoulter Corp. · 1997
- This deviceK973634 Coulter AC.T Diff AnalyzerCoulter Corp. · 1997
- Descendant · cites it directly · 3 of its ownK990352 Coulter AC T Diff 2 AnalyzerCoulter Corp. · 1999 · Recalled
- Descendant · 2 generations on · 1 of its ownK093394 BC-3200 Auto Hematology Analyzer,M-30D Diluent, M-30R Rinse, M-30CFL…Shenzhen Mindray Bio-Medical Electronics Co., Ltd. · 2010
- Descendant · 3 generations on · 0 of its ownK143348 BC-3600 Auto Hematology AnalyzerMindray Bio-Medical Electronics Co., Ltd. · 2015
- Descendant · 2 generations on · 0 of its ownK063407 BC-3200 Auto Hematology AnalyzerShenzhen Mindray Bio-Medical Electronics Co., Ltd. · 2007
Most influential descendants
Showing 4 of 4 · See all- K990352Coulter AC T Diff 2 AnalyzerCoulter Corp. · 1999 · cites it directly3descendants
- K093394BC-3200 Auto Hematology Analyzer,M-30D Diluent, M-30R Rinse, M-30CFL Lyse, M-30E-Z…Shenzhen Mindray Bio-Medical Electronics Co., Ltd. · 2010 · 2 generations on1descendant
- K143348BC-3600 Auto Hematology AnalyzerMindray Bio-Medical Electronics Co., Ltd. · 2015 · 3 generations on0descendants
- K063407BC-3200 Auto Hematology AnalyzerShenzhen Mindray Bio-Medical Electronics Co., Ltd. · 2007 · 2 generations on0descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −2 | K823355 | Coulter-Counter #S Plus IV & Lyse S +D | Coulter Electronics, Inc. | 1982 | — |
| −1 | K964988 | Coulter AC.T Series Analyzer | Coulter Corp. | 1997 | — |
| 0 (this device) | K973634 | Coulter AC.T Diff Analyzer | Coulter Corp. | 1997 | — |
| +1 | K990352 | Coulter AC T Diff 2 Analyzer | Coulter Corp. | 1999 | 1 |
| +2 | K093394 | BC-3200 Auto Hematology Analyzer,M-30D Diluent, M-30R Rinse, M-30CFL Lyse… | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | 2010 | — |
| +3 | K143348 | BC-3600 Auto Hematology Analyzer | Mindray Bio-Medical Electronics Co., Ltd. | 2015 | — |
| +2 | K063407 | BC-3200 Auto Hematology Analyzer | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | 2007 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1999 | 1 | 0 |
| 2007 | 1 | 0 |
| 2010 | 1 | 0 |
| 2015 | 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 GKZ? 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 GKZ device
- #1 K250943 Sysmex XR-Series (XR-10) Automated Hematology…score 13.2 · 3 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (2)
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 |
|---|---|---|---|
| * | K964988 | Coulter AC.T Series AnalyzerSummary page 1…nalyzers C.F.R. Section: 864.5220 Device Class: Class II 510(k) numbers of Coulter devices to which substantial equivalence is claimed: COULTER® A€-T™ Series Analyzer, K964988 COULTER® COUNTER® S-PLUS IV and LYSE S PLUS D, K823355. The product is a hematology Automated Differential Cell Counter which li… | 1997 |
| * | K823355 | Coulter-Counter #S Plus IV & Lyse S +DSummary page 1…I 510(k) numbers of Coulter devices to which substantial equivalence is claimed: COULTER® A€-T™ Series Analyzer, K964988 COULTER® COUNTER® S-PLUS IV and LYSE S PLUS D, K823355. The product is a hematology Automated Differential Cell Counter which like the predicate devices, COULTER AC.T Series Analyzer… | 1982 |
What descends from it? (4)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K990352 | Coulter AC T Diff 2 Analyzer | 1999 | 3 |
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 15 years and passes through 2 companies; a new generation was cleared every 14.2 years on median.
- None of the 2 ancestors has a recall.
- Of its descendants, K990352 (Coulter Corp., 1999) has gone furthest, with 3 descendants of its own.
- 1 other device also cites its predicate K964988.
How does its category compare?
All GKZ devicesGKZ Counter, Differential Cell: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · GKZ
4in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · GKZ
108in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · GKZ
1in 2025
Class I (2 since 2007) Class II/III not classified
Adverse event reports per year · GKZ
77in 2025
MAUDE reports naming product code GKZ, 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 | 6 | 117 | 37 | 268 |
| 2008 | 6 | 99 | 5 | 925 |
| 2009 | 6 | 147 | 13 | 559 |
| 2010 | 4 | 290 | 27 | 896 |
| 2011 | 3 | 315 | 28 | 2,905 |
| 2012 | 3 | 408 | 7 | 2,959 |
| 2013 | 1 | — | 6 | 3,070 |
| 2014 | 3 | 165 | 0 | 3,112 |
| 2015 | 3 | 273 | 3 | 1,972 |
| 2016 | 3 | 198 | 3 | 3,338 |
| 2017 | 4 | 280 | 3 | 229 |
| 2018 | 3 | 270 | 2 (2) | 497 |
| 2019 | 5 | 210 | 2 | 908 |
| 2020 | 1 | — | 1 | 342 |
| 2021 | 0 | — | 0 | 391 |
| 2022 | 3 | 638 | 4 | 198 |
| 2023 | 4 | 329 | 1 | 155 |
| 2024 | 3 | 157 | 0 | 115 |
| 2025 | 4 | 108 | 1 | 77 |
| 2026 | 4 | 254 | 0 | — |
What is it indicated for?
The COULTER® AC-T diff™ analyzer is a quantitative, automated hematology analyzer and leukocyte differential counter For In Vitro Diagnostic Use in clinical laboratories.
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/K973634 · printed Nov 4, 2026
Cite this page
510(k) Report. “K973634: Coulter AC.T Diff Analyzer.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 4, 2026. https://510kreport.com/device/K973634
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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