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We provide a comprehensive cytogenetics service for the investigation of constitutional chromosome abnormalities. Some solid tumour work is undertaken, and fibroblasts can be cultured for biochemical and / or DNA studies.

  • The laboratory is a member of the UK Genetic Testing Network and SE England Genetic Clinical Network.
  • The laboratory is CPA accredited and participates and consistently scores highly in the UK National External Quality Assessment Scheme.
  • The laboratory is also fully accredited for training clinical scientists

Laboratory Contact Details

Telephone 020 8725 5332
Fax 020 8725 0570
Email swtrgl@stgeorges.nhs.uk

The Laboratory is open from 9am to 5pm, Monday to Friday, excluding bank holidays. Advice for test ordering and interpretation is available between these hours. Clinical and referral advice is available from our Clinical Genetics department.

The Laboratory holds all patient information securely and does not give out personal information without consent. Patient confidentiality is maintained in accordance with local and national guidelines. Due to the nature of the interpretive reports we issue, we cannot give results to patients directly, only to their referring doctor.

Should you have a complaint regarding our service, please contact the Laboratory directly either by telephone or email (contact details above), or by contacting St. George’s University Hospitals NHS Foundation Trust Complaints department.

  • As of 01/09/15, we are no longer performing karyotype analysis of solid tumour samples
  • We are no longer performing karyotyping on recurrent miscarriage couples as per Royal College of Obstetrics and Gynaecology guidelines. A letter to this effect has been sent out to all uses of this service. Please contact the Laboratory if you have any questions.
  • We are no longer performing karyotyping for parents of intra-uterine death cases unless there is a specific clinical reason.


New (postnatal) requests can be made using the Laboratory request form.

Request for prenatal analysis should be made using the Prenatal testing request form.

Please note: all requests for array CGH testing must have both pages of the Laboratory Request form completed.

Tests and other information can also be requested via the email address above, preferably from other nhs.uk or nhs.net accounts wherever possible.

Please ensure that patient confidentiality is maintained and no full name or dates of birth are used – please use hospital numbers or other known identifiers where possible.

Prenatal testing information for patients: An introduction to array CGH

Reporting times

The Laboratory aims to report 90% of results within nationally agreed reporting time targets but sometimes this is not achievable. Below are our current median reporting times compared with ACGS target times.

Last updated: 24/04/2019 Target reporting time (days) Median reporting time (days)
Urgent postnatal blood karyotypes 10 7
Urgent prenatal (CVS / amniocentesis) karyotypes / array-CGH 14 8
Routine postnatal blood karyotypes 28 18
Routine postnatal array-CGH 28 15

User Forms

Please note: all requests for array CGH testing must have both pages of the Laboratory Request form completed.

Further details