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CC BY 4.0 · TH Open 2020; 04(04): e427-e436
DOI: 10.1055/s-0040-1721502
Original Article

Utility of the Platelet Function Analyzer in Patients with Suspected Platelet Function Disorders: Diagnostic Accuracy Study

Jonas Kaufmann
1   Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
,
Marcel Adler
1   Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
2   Division of Hematology and Central Hematology Laboratory, CHUV, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
,
Lorenzo Alberio
2   Division of Hematology and Central Hematology Laboratory, CHUV, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
3   Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
,
Michael Nagler 
1   Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
4   University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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Abstract

Introduction The platelet function analyzer (PFA) is widely used as a screening tool for bleeding disorders in various settings. The diagnostic performance regarding platelet function disorders (PFDs), which are among the most common inherited bleeding disorders, is however still elusive. We aimed to assess the diagnostic value of PFA for PFD in clinical practice.

Methods Comprehensive clinical and laboratory data of all consecutive patients referred to a specialized outpatient between January 2012 and March 2017 with a suspected bleeding disorder were prospectively recorded. The diagnostic work-up was performed according to a prespecified protocol following current guidelines and platelet function was tested using light transmission aggregometry as well as flow cytometry.

Results Five hundred and fifty-five patients were included (median age 43.7 years; interquartile range [IQR] 29.3, 61.7; 66.9% female). Possible PFD was diagnosed in 64 patients (11.5%) and confirmed PFD in 54 patients (9.7%). In patients with confirmed PFD, median closure times were 107 seconds (ADP or adenosine diphosphate; IQR 89, 130) and 169 seconds (EPI; IQR 121, 211). In patients without bleeding disorders, PFA closure times were 96 seconds (ADP; IQR 83, 109) and 137 seconds (EPI; IQR 116, 158). The sensitivity was 19.5% in case of PFA ADP (95%CI 12.6, 30.0; specificity 86.4%; 95% CI 82.4, 89.8), and 44.3% in case of PFA EPI (95% CI 34.9, 53.9; specificity 75.6%; 95% CI 70.8, 79.9).

Conclusion The diagnostic performance of PFA for PFD was moderate to poor. Our results do not support the utilization of PFA for screening of PFD in clinical practice.

Keywords

platelet function analyzer - Glanzmann thrombasthenia - platelet rich plasma - Bernard-Soulier syndrome - predictive value

Authors' Contributions

J.K. and M.A. collected the data, participated in data-analysis, and wrote the manuscript. L.A. implemented the work-up of patients, reviewed the data-analysis, and intellectually reviewed the manuscript. M.N. designed the study, conducted the analysis, and wrote the manuscript. All authors approved the final version of the manuscript.




Publication History

Received: 14 July 2020

Accepted: 28 October 2020

Article published online:
22 December 2020

© 2020. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

Georg Thieme Verlag KG
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