Chelator Treatment for Reversing Platelet Clumping in Blood Samples
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Solution Overview
Problem
Platelet clumping in blood samples leads to inaccurate platelet counts, resulting in false diagnoses and unnecessary medical interventions due to spurious low platelet counts (pseudothrombocytopenia) and high white blood cell counts (pseudoleukocytosis) in hematology analyses.
Innovation Solution
The use of chelators such as EDTA or citric acid to reduce reactive Ca2+ ions in blood samples, combined with physical forces like vortexing, sonication, or mechanical mixing, to dissolve platelet clumps and improve platelet count accuracy in assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chelators are used to reduce reactive Ca2+ ions, then platelet clumping is reversed and measurement precision improves, but device complexity increases due to additional chemical treatment steps
Solution Approach 1:
The patent applies preliminary action by pre-treating the blood sample with chelators (EDTA or citric acid) to reduce reactive Ca2+ ions before performing the platelet count assay. This preliminary chemical treatment prevents platelet clumping from occurring during the assay process, thereby improving measurement precision without requiring complex post-assay correction procedures
Solution Approach 2:
The patent uses chelators as intermediary substances that mediate between the reactive Ca2+ ions and platelets. The chelators bind to Ca2+ ions, preventing them from triggering platelet activation and clumping. This intermediary approach allows the assay to proceed with accurate platelet counting by eliminating the harmful Ca2+-mediated clumping mechanism
2Measurement precision
If physical forces like vortexing or sonication are applied to dissolve platelet clumps, then platelet count accuracy improves, but loss of time increases due to additional processing steps
Solution Approach 1:
The patent applies preliminary action by using chelators to prevent platelet clumping before the assay begins. By reducing reactive Ca2+ ions in advance, the need for time-consuming physical disruption methods like vortexing or sonication is eliminated, thereby improving platelet count accuracy without increasing processing time
Solution Approach 2:
The patent replaces mechanical disruption methods (vortexing, sonication) with a chemical approach using chelators. Instead of using mechanical force to break apart clumps after formation, the chelators chemically prevent clump formation by binding Ca2+ ions, thereby achieving accurate platelet counts without the time loss associated with mechanical processing steps
3Reliability
If blood samples are collected in alternative anticoagulants like citrate or heparin, then EDTA-induced platelet clumping is prevented, but up to 17% of patients still show platelet clumping
Solution Approach 1:
The patent applies parameter changes by modifying the chemical environment of the blood sample through the addition of chelators. By changing the concentration of reactive Ca2+ ions through chelation, the patent creates conditions that prevent platelet clumping regardless of which anticoagulant is used, thereby improving platelet count reliability across different anticoagulant types
Solution Approach 2:
The patent achieves universality by developing a solution (chelator addition) that works across multiple anticoagulant types (EDTA, citrate, heparin). The chelators address the common underlying mechanism of platelet clumping (Ca2+ dependence) regardless of which anticoagulant is present, making the solution broadly applicable and improving versatility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of blood cell count assays by effectively reversing platelet clumping, preventing misdiagnosis of conditions like pseudothrombocytopenia and pseudoleukocytosis, and ensuring precise platelet and white blood cell counts.
Implementation Method 1
contacting the blood sample with a chelator capable of reducing reactive Ca2+ from the blood sample
Implementation Method 2
The physical force is selected from vortexing, pipetting, sonication, acoustic mixing, mechanical vibrating (e.g., shaking, inverting, stirring)
Implementation Method 3
applying a physical force to the blood sample
Data Source
AI summary
Provided herein are methods and related compositions and kits for dissolution of platelet clumps formed in collected blood samples. The present methods, compositions and kits are useful for improving blood sample quality and blood assay accuracy in a lab setting, especially in preventing misdiagnosis such as pseudothrombocytopenia or pseudoleukocytosis.