Last reviewed: September 2018
Last updated: March  2018



History and exam

Key diagnostic factors

  • FHx of WAS
  • easy bruising and petechiae

Other diagnostic factors

  • recurrent infections
  • eczema
  • bruises and petechiae
  • lymphadenopathy
  • perforated tympanic membranes
  • serious bleeding
  • serious/life-threatening infection
  • autoimmunity

Risk factors

  • maternal WAS gene mutation carrier
  • male gender

Diagnostic investigations

1st investigations to order

  • CBC with platelet volume
  • WAS protein (WASp) analysis
  • WAS protein (WASp) gene mutation analysis
Full details

Investigations to consider

  • immunoglobulin levels
  • vaccine responses
  • isohemagglutinins
  • lymphocyte subsets
  • T-cell proliferation assays
  • liver function tests
  • PCR analysis for hepatitis C
  • PCR tests for adenovirus, Epstein-Barr virus (EBV), and cytomegalovirus (CMV)
  • store serum and plasma
Full details

Treatment algorithm


Authors VIEW ALL

Siobhan Burns

Reader and Consultant in Immunology

University College London

Department of Immunology

Royal Free Hospital




SB has received research grants from NIHR, UCLH BRC, GOSH/ICH BRC, Rosetree, and the Royal Free Charity in the area of primary immunodeficiency. SB has also received fees for an educational lecture for Baxalta. SB was an expert witness for Wardhadaway Solicitors for a case of Wiskott-Aldrich syndrome, for which she will receive payment. SB is the author of articles cited in this topic.

Adrian Thrasher

Professor of Paediatric Immunology

Molecular Immunology Unit and Centre for Immunodeficiency

Institute of Child Health

University College London




AT has done consultancy work for Orchard Therapeutics and Autolus, and owns stock in both. AT was an expert witness for Wardhadaway Solicitors for a case of Wiskott-Aldrich syndrome. He is an author of references cited in this topic.

Peer reviewers VIEW ALL

Professor of Pediatrics

Mayo Clinic




PF declares that he has no competing interests.

Professor of Pediatrics

Wayne State University

Vice Chair of Education


Institute of Medical Education

The Carman and Ann Adams Department of Pediatrics

Children's Hospital of Michigan




DK declares that he has no competing interests.

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