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Investigations

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The foetus does not produce specific IgM until 23 weeks gestation and no methods able to detect these in cord blood are currently in use - PCR is being evaluated.

Congenitally infected babies are identified by detecting rubella virus specific IgM in the infant's blood:

  • less than 3 months, 100% IgM positive
  • 3 to 6 months, 90% IgM positive
  • 6 to 12 months, 50% Igm positive

Thrombocytopaenia is common.

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