Intended for healthcare professionals

Letters Testing the zygosity of twins

Same sex twins should give consent for zygosity testing except when medically necessary

BMJ 2016; 355 doi: (Published 18 October 2016) Cite this as: BMJ 2016;355:i5584
  1. Sarah E A Smith, primary school teacher (twin 1)1,
  2. Lucy K A Carr (née Smith), paediatric speech therapist (twin 2)1,
  3. Elizabeth M Smith, retired physician2,
  4. Russell E A Smith, consultant physician3
  1. 1London, UK
  2. 2Sutton Coldfield, UK
  3. 3Birmingham, UK
  1. reslgsmith{at}

Vadgama and colleagues recommend genetic testing for zygosity of all same sex twins at birth irrespective of medical need.1 As parents of same sex, dichorionic twins of unknown zygosity, we think that patient and parent choice and consent should be part of the decision, and this is supported …

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