Fetal and neonatal alloimmune thrombocytopenia (FNAIT)

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Find out about fetal and neonatal alloimmune thrombocytopenia (FNAIT), including its causes, symptoms, diagnosis, prevention and treatment. 

Key points

  • Fetal and neonatal alloimmune thrombocytopenia (FNAIT) occurs when the mother’s immune system attacks her fetus’ and/or newborn’s platelets, the blood cells that help stop bleeding.
  • Doctors may suspect a baby has FNAIT if there is bruising, bleeding, a specific pinpoint rash and/or a low platelet count on a blood test.
  • The main treatment for a baby with FNAIT is platelet transfusions.
  • If the mother becomes pregnant again in the future, her doctor should refer her to a hospital that specializes in fetal-maternal medicine for monitoring and treatment.
Last updated: November 9th 2017