Genetics service

Diagnosing and assessing the risk of inheriting a genetic condition


Our service

Our clinical genetics service serves over five million people. Our team works together to offer accurate information and support.

Regional genetics clinics offer services to diagnose and assess the risk of you or your family inheriting a genetic condition. It is not always possible to make a specific diagnosis for a family or child, however, a genetic assessment will help you to understand the possible diagnoses and treatment options.

Genetic counselling

Because diagnosis and testing will often have an impact on the wider family, the genetic counselling process includes an explanation and risk assessment with any available options for family members.

It may take time to adjust to new diagnoses and to decide on the best possible course of action. Our team will provide up-to-date and unbiased information. We suggest asking for an update when the affected person and family members reach reproductive age, and before a new pregnancy. Testing, risk-reducing treatment and research options change over time.

Commitment to research

The genetics clinic is part of the Division of Medical and Molecular Genetics at King’s College London.  Our team are committed to genetic research and academic excellence.

100,000 Genomes project

The South London Genomic Medicine Centre (GMC), hosted by Guy’s and St Thomas’, is one of the centres taking part in the 100,000 Genomes Project.

The national programme will focus on cancer and rare diseases and will enable pioneering research to decode 100,000 human genomes, a scale not seen anywhere else in the world.

Find out how Guy's and St Thomas' are involved in the 100,000 Genomes Project.


Prenatal genetics course

We are running a three-day, skills-based course from Thursday 5 to Saturday 7 September 2019 exploring the application of genetics and genomics in a prenatal setting.

It is aimed at midwives and other health professionals working in prenatal testing but with little training in genetics tools.

Topics covered include:

  • obtaining a family history
  • identifying high-risk family histories
  • approaches to genetic testing
  • consent taking and counselling skills associated with providing information and results.

You can find the timetable for the course here (Word 15Kb). For more information and how to book, see the course flyer (PDF 186Kb).

Genetic counselling experience

Due to the high volume of requests, we are unable to offer shadowing or work experience within the genetic counselling team.

For individuals interested in a career in genetic counselling, we offer a half-day of talks about various aspects of the profession and the day-to-day life of a Genetic Counsellor at Guy’s Clinical Genetics. If you would like to be informed about the next available day, please contact the coordinator to register your interest ( A small monetary contribution may be required to secure your place.

  • The next genetic counselling taster day: Tuesday 16 July, 2019

Rare diseases centre

A new Rare diseases centre opened at St Thomas' Hospital at the end of 2017.

A collaboration between King’s Health Partners and PHG Foundation has been undertaking a health economic analysis into the cost effectiveness of using exome sequencing as a routine clinical test. The results from the pilot project, which was funded by Guy’s and St Thomas’ NHS Foundation Trust, are now published in the free report Whole-exome sequencing in clinical genetics: A health economic evaluation.

This is an evidence-based economic evaluation to assess the costs of routine clinical use of exome sequencing in clinical genetics.  The results show that if used as a near first line and sequencing costs could be reduced further, the test would represent cost-effective use of NHS resources  given the much higher detection rate.

  • From the 4 September 2017 we will be offering an updated prenatal array CGH service with higher resolution analysis. Please go to our Prenatal Referrals Page for further information.


Genetics clinic
7th floor, Borough Wing
Guy's Hospital
Great Maze Pond
London SE1 9RT

Tel: 020 7188 1364
Email: gst-tr.geneticsreferrals

Borough Wing 

Download the map (PDF 35Kb)

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