Platelet Clump Dissolution Using Chelators and Physical Mixing
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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 the exclusion of clumped platelets by hematology instruments, which cannot differentiate between individual platelets and clumps.
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, to dissolve platelet clumps and improve the accuracy of platelet count assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hematology instruments count platelets by sizing, then the counting process is automated and efficient, but clumped platelets are excluded and produce spuriously low platelet counts
Solution Approach 1:
The method applies chelators and physical forces to the blood sample before performing the platelet count assay. This preliminary treatment dissolves platelet clumps into individual platelets, ensuring that the subsequent automated counting accurately reflects the true platelet count rather than excluding clumped platelets
Solution Approach 2:
The invention introduces chelators (such as EDTA or citric acid) as intermediary substances that bind calcium ions, thereby preventing calcium-mediated platelet aggregation. This intermediary action eliminates the harmful clumping effect while allowing the automated sizing method to continue functioning
2Adaptability or versatility
If platelet clumping occurs due to autoantibodies and EDTA, then alternative anticoagulants like citrate or heparin may be used, but up to 17% of patients still show clumping in citrate
Solution Approach 1:
The method changes the chemical parameters of the blood sample by introducing chelators that specifically target calcium ions. This parameter change (reducing free calcium concentration) prevents platelet aggregation regardless of which anticoagulant is used, making the solution universally effective across different anticoagulant types
3Loss of information
If platelet clumps are formed in collected blood samples, then false diagnosis and unnecessary investigations occur, but methods to prevent or dissolve clumps in vivo are not sufficient for laboratory samples
Solution Approach 1:
The method extracts the harmful factor (calcium ions) from the blood sample by using chelators to bind and remove free calcium. This extraction eliminates the cause of platelet aggregation in the laboratory sample without requiring complex in vivo treatments or patient intervention
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 platelet count assays by effectively reversing platelet clumping, preventing misdiagnoses like pseudothrombocytopenia and pseudoleukocytosis, and ensuring reliable blood cell count measurements.
Implementation Method 1
contacting the blood sample with a chelator capable of reducing reactive Ca2+ from the blood sample
Implementation Method 2
applying a physical force to the blood sample. In some aspects, the physical force is selected from vortexing, pipetting, sonication, acoustic mixing, mechanical vibrating
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.