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Genetics information for patients

Diagnosing and assessing the risk of inheriting a genetic condition

Coronavirus: genetics service update

In response to the coronavirus (COVID-19) outbreak, please read our advice and information before attending the service.

Clinic location

  • Guy's Hospital
    Clinical genetics
    7th floor, Borough Wing
    Great Maze Pond
    London SE1 9RT

    Tel: 020 7188 1364
    Opening hours: Monday - Friday, 9am - 5pm

    You can book a call back from our team

    In an emergency: call switchboard on 020 7188 7188 

    You will see one of our team at either our main site (Guys Hospital) or one of our peripheral clinics. See the clinical genetics service page for more information about the clinics we hold.

  • Borough WingMap to 7th floor, Borough Wing (PDF 44Kb)


  • Cancelling or changing your appointment 

    If you need to change or cancel an appointment, please call us on 020 7188 1397 (Monday-Friday, 9am-4.30pm) or Email:

    Alternatively, you can book a call back from our appointments team.

    We can book you into the next available clinic, but if you need to change or cancel this second booking, your doctor will need to refer you again. If you do not come to your appointment and have not cancelled it in advance, a new referral from your doctor will be needed.

    Some appointments are time-sensitive and a change of date may influence your options and our ability to offer you a specialist service. If you have questions about coming to the genetics department, please ask your referrer or ring us.

  • Before your appointment 

    Please check your appointment letter for the location of your appointment. Genetics clinics are held both on the Guy’s (SE1 9RT) and St Thomas’ (SE1 7EH) sites and other hospitals within our region.

    You should receive a map and directions with your letter.

    You may bring a friend or relative to your appointment with you. 

    You may find it helpful to write down any questions or concerns you have and bring them with you to your appointment.

    Please let us know if you will need an interpreter.

    If you are sent a family history information sheet, please complete it and return the form to us before your appointment.  This information is kept confidential. We will not discuss your details with anyone apart from your medical team, unless we have your permission.

  • At your appointment

    If we can make a diagnosis, we will help you to understand what happened. You will learn more about the condition and its variability. We can tell you about the chance of future children or other relatives being affected. Even if there isn't an exact diagnosis, your genetic specialist will explain things to you clearly.

    Your appointment will take about 45 minutes. We may:

    • need to arrange a blood test
    • suggest other tests
    • make a follow-up plan with you
    • discuss your treatment and reproductive options.

    We will give you information to help you make your own decisions and will support you whatever decision you make.

    We may ask if you wish to take part in clinical research. If you decide to take part, we will make sure you are aware of the implications and that you may not receive personal results. The care you receive will not be affected if you decide not to participate

    We hold joint clinics where other specialists may be present. Your appointment letter will contain more information.

    As we are a teaching hospital, we will ask your permission if medical or genetic counselling students would like to observe your appointment. This is valuable training for them, but please tell us if you do not want this. Your decision will not affect your care in any way.

Useful links

Patient leaflets offering advice

Genetic Alliance website – this organisation aims to help families with genetic conditions to get the services, information and support they need.

UNIQUE website provides support to families who have a rare chromosome disorder 

Orphanet website is a unique resource, gathering and improving knowledge on rare diseases so as to improve the diagnosis, care and treatment of patients with rare disease.