Issue |
J Extra Corpor Technol
Volume 34, Number 3, September 2002
|
|
---|---|---|
Page(s) | 178 - 181 | |
DOI | https://doi.org/10.1051/ject/2002343178 | |
Published online | 11 August 2023 |
Comparison of Five Point-of-Care Prothrombin and Activated Partial Thromboplastin Time Devices Based on Age of Blood Sample
State University of New York Upstate Medical University, Department of Cardiovascular Perfusion, Department of Anesthesiology, and Department of Clinical Laboratory Science, SUNY, Syracuse, New York
* Address correspondence to: Bruce Searles, BS, CCP, Department of Cardiovascular Perfusion, College of Health Professions, SUNY Upstate Medical University, 750 East Adams St., Syracuse, NY 13210, E-mail: searles@upstate.edu
Received:
13
April
2000
Accepted:
15
June
2002
Delays in processing statium (STAT) blood samples have led to the production of an increasing number of point-of-care tests. Product inserts recommend measuring blood samples immediately after procurement, suggesting that delays may invalidate the test results. We studied the effect of the age of blood samples on point-of-care (POC) prothrombin time (PT) and an activated partial thromboplastin time (aPTT) result. Informed consent was obtained from 11 patients undergoing cardiopulmonary bypass (CPB). Blood samples (40 mL) were taken from each patient. Each blood sample was used to perform five PT tests and six aPTT tests on five POC devices (Gem PCL, Hemochron 801, Hemochron Jr. Signature, Hemochron Response, Rapidpoint Coag) at three different sample ages [<60 s (fresh blood), 10 and 18 min after sample collection]. Blood samples were procured in a plastic syringe devoid of air bubbles, which was left undisturbed between tests but was gently agitated before initiating the 10- and 18-min tests. For tests requiring citrated whole blood, a fraction of each sample was anticoagulated (3.8% citrate) at each age. Statistical analysis was used for comparison of test results for fresh blood to aged samples (10 and 18 min). Test values were recorded as International Normalized Ratio (INR) and seconds for PT and aPTT, respectively. Two devices, the Hemochron 801 and Hemochron response showed statistically, although not clinically, significant variation in PT test results when the samples were aged to 10 and 18 minutes. As for aPTT results, Hemochron 801, Hemochron response, Hemochron Jr. signature, and Gem PCL showed statistically significant variation at 18 minutes. One device (Hemochron 801) reported results with 10-min aged blood that were statistically different from fresh blood. None of the aPTT tests results from any device produced results with aged blood that were clinically different from fresh blood. This study suggests that, in the tests evaluated, blood samples that have aged 10 or 18 min will produce clinically relevant aPTT and PT results, respectively.
Key words: point-of-care / prothrombin time / partial thromboplastin time
© 2002 AMSECT
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.