Anti-PF4 testing for vaccine-induced immune thrombocytopenia and thrombosis and heparin induced thrombocytopenia: Results from a UK National External Quality Assessment Scheme exercise April 2021.
J Thromb Haemost
; 19(9): 2263-2267, 2021 09.
Article
in English
| MEDLINE | ID: covidwho-1297836
ABSTRACT
BACKGROUND:
Vaccine-induced immune thrombocytopenia and thrombosis (VITT) following the administration of the AstraZeneca (AZ) ChAdOx1 nCOV-19 vaccine has recently been reported. The associated clinical and laboratory features have included thrombosis at unusual sites, thrombocytopenia, and raised D-dimers with positivity for IgG anti-platelet factor 4 (PF4) antibodies.OBJECTIVES:
A UK National External Quality Control Assessment Scheme external quality control exercise was carried out by distributing liquid and lyophilized samples from a subject with VITT, a pool of samples from subjects with classical heparin-induced thrombocytopenia (HIT), and a non-VITT/non-HIT case to 85 centers performing HIT testing.METHODS:
Participating centers employed their locally validated testing methods for HIT assays.RESULTS:
The lyophilized and liquid samples were found to be commutable for the ELISA assays used in the detection of anti-PF4 antibodies. The Aeskulisa, Stago, Hyphen, and LIFECODES anti-PF4 ELISA assays successfully detected the VITT antibody, whereas the Acustar HIT, Werfen LIA, and the Stago STIC assays did not.CONCLUSION:
It is important that clinical and laboratory teams are aware of the limitations of some anti-PF4 assays when using them to aid diagnosis of VITT syndrome.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Thrombocytopenia
/
Thrombosis
/
Vaccines
/
Purpura, Thrombocytopenic, Idiopathic
Type of study:
Diagnostic study
/
Observational study
/
Prognostic study
Topics:
Vaccines
Limits:
Humans
Country/Region as subject:
Europa
Language:
English
Journal:
J Thromb Haemost
Journal subject:
Hematology
Year:
2021
Document Type:
Article
Affiliation country:
Jth.15423
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