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Fluorescence-based blood coagulation assay device for measuring activated partial thromboplastin time

Dudek, M., Kent, N., Gustafsson, K., Tomas, L. and Killard, A. (2011) Fluorescence-based blood coagulation assay device for measuring activated partial thromboplastin time. Analytical Chemistry, 83 (1). pp. 319-328. ISSN 0003-2700 Available from:

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The measurement of blood clotting time is important in a range of clinical applications such as assessing coagulation disorders and controlling the effect of various anticoagulant drug therapies. Clotting time tests essentially measure the onset of clot formation which results from the formation of fibrin fibers in the blood sample. However, such assays are inherently imprecise due to the highly variable nature of the clot formation process and the sample matrix. This work describes a clotting time measurement assay which uses a fluorescent probe to very precisely detect the onset of fibrin clot formation. It uses a microstructured surface which enhances the formation of multiple localized clot loci and which results in the abrupt redistribution of the fluorescent label at the onset of clot formation in both whole blood and plasma. This methodology was applied to the development of an activated partial thromboplastin time (aPTT) test in a lateral flow microfluidic platform and used to monitor the effect of heparin dosage where it showed linearity from 0 to 2 U/mL in spiked plasma samples (R(2)=0.996, n = 3), correlation against gold standard coagulometry of 0.9986, and correlation against standard hospital aPTT in 32 patient samples of 0.78.

Item Type:Article
Uncontrolled Keywords:fluorescence-based, blood coagulation
Faculty/Department:Faculty of Health and Applied Sciences > Department of Biological, Biomedical and Analytical Sciences
ID Code:16495
Deposited By: C. Foyle
Deposited On:02 Feb 2012 14:14
Last Modified:22 Feb 2013 11:47

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