Carrier Screening UK – Before or Early in Pregnancy

Carrier screening UK is available to see if you and/or your partner are a carrier of a genetic condition that could affect your baby. Most carriers are completely healthy, have no symptoms and often have no known family history, which is why carrier screening is usually only identified through testing.

Many inherited conditions are recessive, meaning that a baby is usually only affected if both parents carry a change in the same gene. Some conditions are X-linked and are inherited differently. If both parents carry the same recessive condition, there is typically a 1 in 4 (25%) chance that the baby could be affected.

Carrier screening is increasingly considered as part of modern pre-pregnancy and early pregnancy care. It can help identify hidden reproductive risk before conception or, if testing has not been performed beforehand, it can still be undertaken in early pregnancy to guide further counselling, partner testing and decisions about additional testing where appropriate.

At Innermost Healthcare, we offer private carrier screening in Cardiff and across the UK, including tests for conditions such as Spinal Muscular Atrophy (SMA), cystic fibrosis, Fragile X syndrome, haemoglobinopathies, metabolic disorders and many other inherited conditions. Depending on the panel selected, screening may range from core high-impact conditions to very broad expanded panels covering hundreds of recessive and X-linked disorders.

Carrier screening may be particularly relevant for couples planning pregnancy, those already pregnant, patients undergoing IVF or fertility treatment, people with a family history of genetic disease, and anyone seeking greater reassurance before or during pregnancy.

If the results show that both prospective parents are carriers of the same condition, there are several options:

• you could choose to have IVF and screen your embryos so that only healthy ones are implanted in the womb
• you could have genetic testing during pregnancy
• you could think again about pregnancy and some people then decide that adoption or IVF with donor eggs or donor sperm is the best choice for them
• you could have newborn testing after baby is born

If prenatal diagnostic testing is considered, procedures such as chorionic villus sampling (CVS) or amniocentesis may be discussed. The miscarriage risk from invasive testing is approximately 1 in 200.

Testing is a very personal choice and our experts will help you decide whether it is right for you. Being armed with all the facts can support you to make informed choices about trying to conceive (or not), testing during pregnancy and how your pregnancy will be managed.

Carrier screening may be considered alongside other early pregnancy investigations, including first trimester care and early pregnancy scans and non-invasive prenatal testing (NIPT), in order to provide a more complete assessment of your baby’s health and your reproductive options.

Many people choose to supplement their standard NHS care with private tests, scans and consultations to provide additional reassurance and access to a wider range of screening options. Whether you want a simple first-line screen, a clinically curated panel, or the most comprehensive expanded carrier screening available, our consultant-led team will guide you through your options with clarity and support.

Available Carrier Screening Options

We offer a range of carrier screening tests to suit different needs, from focused panels to very broad expanded screening:

• Medicover Adventia – saliva-based testing for approximately 20 to 229+ conditions depending on panel selected
• Natera Horizon – blood-based testing with clinically curated panels (including 274 and 613 condition options)
• BioArray Carrier Screen – saliva-based expanded screening covering approximately 420 conditions
• Fulgent Beacon Carrier Screen – cheek swab – highly expanded panels covering approximately 1000 conditions

The most appropriate test depends on your clinical situation, timing (pre-pregnancy or during pregnancy), and how comprehensive you would like your screening to be.

When Should Carrier Screening Be Performed?

Carrier screening can be performed:

• Before pregnancy – providing the widest range of reproductive options
• During early pregnancy – helping guide further testing and decision-making

Sample Types

• Blood tests – used for tests such as Natera Horizon
• Saliva or cheek swab tests – used for Adventia, BioArray and Fulgent Beacon

Frequently Asked Questions

Is carrier screening necessary if we are healthy?

Yes. Most carriers have no symptoms and no family history.

Can carrier screening be done during pregnancy?

Yes. It is commonly performed in early pregnancy.

What if only one parent is a carrier?

The baby is very unlikely to be affected but may be a carrier.

Is the test safe?

Yes. It involves only a blood, saliva or cheek swab sample and poses no risk.

Which sample will I need?

This depends on the test chosen.