title: Alpha thalassaemia hydrops fetalis in the UK: the importance of screening pregnant women of Chinese, other South East Asian and Mediterranean extraction for alpha thalassaemia trait.
abstract: OBJECTIVE
  Alpha zero (alpha 0 or alpha-1) thalassaemia is an important genetic risk for women originating from Hong Kong, Singapore, Vietnam, Thailand, the Philippines or South China. Cypriots are also at risk. Carriers of alpha zero thalassaemia trait can be detected by routine haemoglobinopathy screening. When a couple are both carriers, in each pregnancy there is a 25% risk that the fetus will have alpha thalassaemia hydrops fetalis; this is fatal for the fetus and carries serious obstetric and psychological risks for the mother. Most informed couples at risk request prenatal diagnosis and selective abortion. This study investigates the effectiveness of screening, counselling and prenatal diagnosis for alpha thalassaemia hydrops fetalis in the UK.
  
  
  METHODS
  Retrospective analysis of the notes.
  
  
  METHODS
  18 couples attending University College Hospital London for prenatal diagnosis of alpha thalassaemia hydrops fetalis since 1982.
  
  
  RESULTS
  The study shows underdiagnosis of both alpha zero thalassaemia trait and alpha thalassaemia hydrops fetalis leading to avoidable stillbirths and complications in pregnancy.
  
  
  CONCLUSIONS
  We recommend early screening for alpha zero thalassaemia trait for all women of Southeast Asian or eastern Mediterranean origin and the offer of prenatal diagnosis when indicated. The diagnosis of alpha thalassaemia hydrops fetalis should be considered in women of the relevant ethnic origin who have a stillbirth, neonatal death, abnormal ultrasound findings at fetal anomaly scanning (especially a large placenta), or who develop pre-eclampsia.
authors: Department of Obstetrics & Gynaecology, UCMSM-UCL, London, UK.
authors: M
authors: M
authors: Petrou
authors: M
authors: M
authors: Brugiatelli
authors: J
authors: J
authors: Old
authors: P
authors: P
authors: Hurley
authors: R H
authors: RH
authors: Ward
authors: K P
authors: KP
authors: Wong
authors: C
authors: C
authors: Rodeck
authors: B
authors: B
authors: Modell
mesh_terms: D000022:Abortion, Spontaneous; D001210:Asia, Southeastern / Q000208:ethnology; D002681:China / Q000208:ethnology; D003535:Cyprus / Q000208:ethnology; D005260:Female; D005817:Genetic Counseling; D005820:Genetic Testing; D006801:Humans; D015160:Hydrops Fetalis / Q000175:diagnosis* / Q000208:ethnology; D008131:London; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D012189:Retrospective Studies; D012307:Risk Factors; D017085:alpha-Thalassemia / Q000175:diagnosis* / Q000208:ethnology