Cleared Special

K253957 - HemosIL Silica Clotting Time

K253957 is the FDA 510(k) clearance for HemosIL Silica Clotting Time by Instrumentation Laboratory (IL) Co.. It is a Class 2 Hematology device (product code GFO) cleared through the Special 510(k) pathway after a 30-day FDA review.

K253957 · Instrumentation Laboratory (IL) Co. · Hematology device
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Jan 2026
Decision
30d
Days
Class 2
Risk

K253957 is an FDA 510(k) clearance for the HemosIL Silica Clotting Time. Classified as Activated Partial Thromboplastin (product code GFO), Class II - Special Controls.

Submitted by Instrumentation Laboratory (IL) Co. (Bedford, US). The FDA issued a Cleared decision on January 9, 2026 after a review of 30 days - a notably fast clearance cycle.

This device falls under the Hematology FDA review panel, regulated under 21 CFR 864.7925 - the FDA hematology device framework. As a Special 510(k), this submission covers a manufacturer modification to an existing cleared device rather than a new device introduction.

Device pattern: Iterative device modification. Low regulatory complexity profile. This Special 510(k) clearance confirms that the manufacturer's modifications remained within the established regulatory envelope of the original cleared device.

View all Instrumentation Laboratory (IL) Co. devices

Submission Details

510(k) Number K253957 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received December 10, 2025
Decision Date January 09, 2026
Days to Decision 30 days
Submission Type Special
Review Panel Hematology (HE)
Summary Summary PDF
Third-party Review No - reviewed directly by FDA
Combination Product No
PCCP Authorized No
Regulatory Context
Review time vs. panel average
83d faster than avg
Panel avg: 113d · This submission: 30d
Pathway characteristics
Modification to existing cleared device.

Device Classification

Product Code GFO Activated Partial Thromboplastin
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 864.7925
What this classification means

Class II devices require demonstration of substantial equivalence to a legally marketed predicate device. This pathway does not require clinical trials - it relies on engineering equivalence and performance data. Most Hematology devices follow this clearance model.

Regulatory Peers - GFO Activated Partial Thromboplastin

All 36
Devices cleared under the same product code (GFO) and FDA review panel - the closest regulatory comparables to K253957.
Cryocheck Hex LA
K193556 · Precision Biologic · Oct 2020
HemosIL Silica Clotting Time
K160445 · Instrumentation Laboratory CO · Mar 2016
HEMOSIL SYNTHASIL
K060688 · Instrumentation Laboratory CO · Apr 2006
HEMOSIL SILICA CLOTTING TIME
K050221 · Instrumentation Laboratory CO · Mar 2005
SIGMA DIAGNOSTICS ALEXIN HS, MODELS A0969, A1094
K992711 · Sigma Diagnostics, Inc. · Dec 1999
SIGMA DIAGNOSTICS ALEXIN LS, MODELS A1219, A1334
K992712 · Sigma Diagnostics, Inc. · Dec 1999