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  • Title: Effects of storage and thawing conditions on coagulation testing.
    Author: Gosselin RC, Honeychurch K, Kang HJ, Dwyre DM.
    Journal: Int J Lab Hematol; 2015 Aug; 37(4):551-9. PubMed ID: 25766006.
    Abstract:
    INTRODUCTION: Current recommendations for coagulation testing storage and thawing are based on historical studies that were performed using unbuffered 3.8% sodium citrate. We sought to measure the effects of freezing and thawing conditions 3.2% buffered sodium citrate plasma samples that have been stored in vials with either snap or sealed screw tops, frozen in -70 °C freezer or dry ice and thawed either capped or uncapped. METHODS: Shed blood samples were pooled and then aliquoted into four snap top and four screw tops vials. Half the vials were stored in a -70 °C freezer, and half on dry ice for at least 16 h. Afterwards, half the frozen samples were thawed in 37 °C waterbath capped, and other half were thawed capped. After thawing cycles, samples were tested for PT, activated partial thromboplastin time (APTT), fibrinogen, D-dimer, factor assays, von Willebrand factor activity, plasminogen, antithrombin, protein C and lupus anticoagulant. RESULTS: Prothrombin time, APTT, factor X, and lupus anticoagulant testing were affected by all vials, freezing and thawing conditions, whereas fibrinogen, D-dimer, von Willebrand activity or protein C were not affected by any vial, freezing or storage condition. CONCLUSIONS: Storage vials, freezing and thawing condition affect coagulation testing, although these differences may not be clinically significant.
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