| The investigation of a prolonged APTT with specific clotting factor assays is unnecessary if an APTT with Actin FS is normal. | |
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MedLine Citation:
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PMID: 20880301 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Introduction: An isolated prolongation to the activated partial thromboplastin time (APTT) can be caused by the presence of the lupus anticoagulant or an intrinsic or contact factor deficiency, of which only deficiencies of factors VIII, IX or XI are associated with bleeding. Our local protocol states that further investigation of a prolonged APTT by specific assays of FVIII, FIX and FXI should only be undertaken where the APTT with one reagent (Synthasil) is more than 3 s prolonged, and further investigation by an APTT with a second reagent (Actin FS) is also prolonged, unless there is a history of bleeding in the patient, in which case assays are indicated irrespective of the APTT. Methods: We retrospectively reviewed the results of all APTTs performed over a 36 -month period to evaluate whether strictly applying our protocol would reduce the number of unnecessary clotting factor assays performed, without leaving patients with potentially significant bleeding disorders undiagnosed. Results: Of a total number of 587 samples tested for coagulation factors VIII, IX and XI, only 117 samples yielded an abnormal result. Thus, 80% of all the assays requested in the 3 -year period audited gave a result within the reference range for factors VIII, FIX and XI. Three quarters of the abnormal results revealed mild FXI deficiency. Conclusion: This review has demonstrated that no significant coagulation factor deficiency would be left undiagnosed if the protocol was followed. This would have considerably reduced the cost and time spent performing these assays. |
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Authors:
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A Bowyer; J Smith; A M Woolley; S Kitchen; K K Hampton; R M Maclean; J J VAN Veen; M Makris |
Publication Detail:
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Type: Journal Article Date: 2010-09-29 |
Journal Detail:
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Title: International journal of laboratory hematology Volume: 33 ISSN: 1751-553X ISO Abbreviation: Int J Lab Hematol Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-03-08 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101300213 Medline TA: Int J Lab Hematol Country: England |
Other Details:
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Languages: eng Pagination: 212-8 Citation Subset: IM |
Copyright Information:
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© 2010 Blackwell Publishing Ltd. |
Affiliation:
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Sheffield Haemophilia and Thrombosis Centre, Sheffield, UK Division of Cardiovascular Science, University of Sheffield, Sheffield, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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