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Updated: Jul 20, 2026
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Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization
Published on: June 4, 2020
In vitro testing of platelets using the thromboelastogram, platelet function analyzer, and the clot signature
1Naval Blood Research Laboratory (NBRL) Inc, Plymouth, MA 02360, USA. navblood@nbrl.org
Summary
In vitro tests like the clot signature analyzer (CSA) and platelet function analyzer (PFA) could not predict bleeding time (BT). Thromboelastogram (TE) showed some correlation but ultimately failed to reliably predict BT.
Area of Science:
- Hematology
- Clinical Pathology
- Hemostasis Research
Background:
- Platelet function tests, including aggregation, thromboxane A2 production, and annexin V binding, are standard in vitro assessments.
- The study investigated the predictive value of three specific in vitro diagnostic tools for bleeding time.
Purpose of the Study:
- To evaluate the clot signature analyzer (CSA), platelet function analyzer (PFA), and thromboelastogram (TE) as predictors of template bleeding time (BT).
Main Methods:
- Twelve healthy volunteers underwent red blood cell (RBC) removal.
- Measurements of TE, CSA, and PFA, along with template BT, were taken before and at multiple time points after RBC manipulation (removal and/or reinfusion).
Main Results:
- Template bleeding time (BT) significantly increased after RBC removal and decreased after reinfusion in females.
- No significant correlations were found between BT and CSA (PHT, CT) or PFA (CT) results.
- Significant correlations were observed between BT and TE parameters (K time, MA, angle).
Conclusions:
- The study concluded that CSA, PFA, and TE are not reliable predictors of template bleeding time in this context.
- Further research may be needed to explore other potential predictors or refine existing in vitro assays.
