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Pre-implantation genetic screening (CGH)

Comprehensive screening of chromosomes in an embryo

Comparative genomic hybridisation (CGH) genetic screening checks chromosomes in an embryo for abnormalities

Email us

HCA Booking Line:

0207 079 4344

About CGH screening

Array CGH is a preimplantation genetic screening (PSG) test. It comprehensively screens all chromosomes in an embryo for abnormalities before it is transferred to the womb. Genetically normal embryos have a higher chance of implantation and the resulting pregnancies have a lower chance of miscarriage.

Need to know

  • What happens icon plus

    The procedure is usually divided into the following steps: Step 1: Assisted reproduction You will have routine IVF or ICSI to produce eggs, which are then collected and fertilised. Step 2: Embryo biopsy When the embryos are five days old, a few cells are removed from each one and sent for testing. The embryos being analysed do not leave the clinic — they are either returned to the incubator or frozen until the test results are available. Step 3: Genetic testing The cells are then analysed independently. The test results show how many copies there are of each chromosome, revealing if there are any abnormal embryos.

  • How to prepare icon plus

    Your consultant will let you know exactly what happens during the procedure and answer any questions you may have.

  • Afterwards icon plus

    Your results should be available within 24-36 hours. However, sometimes we can have results for you within four hours. Once genetic testing is complete, we use the results along with standard assessments to help us decide which embryos to transfer to the womb. No test is 100% accurate, so following any genetic screening, we also recommend that you have prenatal testing if you become pregnant.

Our consultants

We're proud to work with leading experts across a range of medical fields, whose skills are matched by their integrity and compassion.
Consultant in theatres

Our locations

From complex fertility circumstances to tests and screening, we provide exceptional care across our network of hospitals, outpatient centres and specialist clinics.

Request an appointment

Our booking teams can help you make an appointment with one of our experienced consultants.

020 7079 4344
Book an appointment
This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.
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