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Serotonin release assay (SRA)-negative HIT, a newly recognized entity: Implications for diagnosis and management

      Highlights

      • Some platelet-activating HIT antibodies may not induce serotonin release in the SRA.
      • The PEA detected SRA-negative antibodies in the two HIT patients described
      • Recognition of “SRA-negative HIT” is important for appropriate patient management.

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