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Oxford University Hospitals NHS Foundation Trust

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Postnatal blood sample information


  • Possible syndrome
  • Indeterminate gender / ambiguous genitalia
  • Dysmorphism
  • Multiple congenital abnormalities
  • Developmental delay
  • Learning difficulties
  • Infertility
  • Recurrent miscarriages
  • Known or suspected familial chromosome rearrangement
  • Possible chromosomal mosaicism


  • Karyotyping
  • Rapid aneuploidy 13, 18 or 21 screening
  • Array CGH (selected referrals of learning difficulties / developmental delay / dysmorphism / congenital abnormalities)

Sample type: Blood

Note: referrals in conjunction with Clinical Genetics.

Turnaround time

Turnaround times for testing have been specified by NHS England

However, please note that blood karyotyping requires short term cell culture before analysis and therefore turnaround time is affected by cell compromise such as undue heat or transport delays and clotted samples.

Service Agreement

By sending a sample, accompanied by a completed laboratory referral form, the user enters into an agreement for the Genetics Laboratory to provide the service or test requested and agrees to the terms and conditions.

Last updated: 31-Oct-2019 by Claire Scott