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Knovich, M.A. et al.

Mary Ann Knovich, Heather L. Lawson, Martha H. Burke, Thomas P. McCoy, John Owen,

Rapid quantitative assay of ADAMTS13 activity on an automated coagulation analyzer: clinical applications and comparison with immunoblot method.

Facile assays for ADAMTS13, the metalloprotease that is absent or impaired in thrombotic thrombocytopenic purpura, could allow for timely diagnosis and management of this potentially fatal hematologic disorder; unfortunately, available assays employ methodologies that restrict use to only a few reference laboratories, resulting in reporting delays. Measurement of ADAMTS13 on an automated analyzer could allow widespread accessibility by routine clinical laboratories. We adapted a previously published technique to demonstrate that ADAMTS13 activity could be measured on an Instrumentation Laboratory automated coagulation analyzer after plasma digestion of a commercial source of von Willebrand factor (VWF). Results were obtained using a commercially available immunoturbidimetric assay for residual VWF activity. Samples from 114 patients with suspected thrombotic microangiopathy were analyzed by both standard immunoblot and our new semiautomated method with excellent agreement, particularly at the clinically relevant low levels of ADAMTS13 activity. This new method is semiautomated and offers quantitative results within 2 hr; our modifications allow for widespread applicability on instrumentation already in use by routine clinical laboratories.[1]

References

Rapid quantitative assay of ADAMTS13 activity on an automated coagulation analyzer: clinical applications and comparison with immunoblot method. Knovich, M.A., Lawson, H.L., Burke, M.H., McCoy, T.P., Owen, J. Am. J. Hematol. (2008) [Pubmed]

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