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Foshat M, Bates S, Russo W, Huerta A, Albright K, Giddings K, Indrikovs A, Qian YW. Effect of Freezing Plasma at –20°C for 2 Weeks on Prothrombin Time, Activated Partial Thromboplastin Time, Dilute Russell Viper Venom Time, Activated Protein C Resistance, and d-Dimer Levels. Clin Appl Thromb Hemost 2014; 21:41-7. [DOI: 10.1177/1076029614535973] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
To assess the impact of preanalytical variables of time and temperature on prothrombin time (PT), activated partial thromboplastin time (aPTT), dilute Russell viper venom time (DRVVT), activated protein C resistance (APCR), and d-dimer, samples from 23 healthy individuals and 18 patients having coagulopathy with known abnormal PT and aPTT were collected. Plasma from each individual was separately pooled and aliquoted; the first 2 aliquots were stored at room temperature then analyzed at 2 hours (baseline) and 4 hours postcollection. The remaining aliquots were stored at −20°C and thawed for analysis at 48 hours, 1, and 2 weeks. In both healthy participants and participants with coagulopathy, PT, aPTT, APCR, DRVVT, and D-dimer had no significant changes at 4 and 48 hours, and 1 and 2 weeks postcollection compared to baseline, or the changes were less than 10%. The results indicate PT, aPTT, DRVVT, APCR, and d-dimer can be stored for 2 weeks at −20°C without compromising clinical interpretation in both healthy individuals and individuals with coagulopathy. Increasing storage time will facilitate sample processing from off-site clinics.
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Affiliation(s)
| | | | - Wendy Russo
- University of Texas Medical Branch, Galveston, TX, USA
| | | | | | | | | | - You-wen Qian
- University of Texas Medical Branch, Galveston, TX, USA
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