Private Fragile X Syndrome screen - FMR1 repeat analysis PCR London
Fragile X Syndrome screen - FMR1 repeat analysis PCR to provide genetic insights and guide personalized healthcare decisions.
Fragile X Syndrome screen - FMR1 repeat analysis PCR
Test fee £620 + £50 phlebotomy fee (per visit)
- Results in 5 weeks"
- UKAS accredited laboratory
- Professional phlebotomy service
- Confidential results portal
Or call 020 7183 2362
Pay at clinic on the day of your appointment
Fragile X Syndrome Screen – FMR1 Repeat Analysis in London
Fragile X Syndrome FMR1 repeat analysis is available at South Kensington Medical and Dental, our CQC-registered clinic in South Kensington, London SW7. This test is priced at £620. A £50 phlebotomy fee applies per visit for blood collection. It requires a venous blood sample, and results are typically available within 5 weeks. A referral from a clinical geneticist is required before this test can be ordered.
Fragile X Syndrome is the most common inherited cause of intellectual disability and the most common single-gene cause of autism spectrum disorder. It is caused by an expansion of CGG trinucleotide repeats in the FMR1 gene on the X chromosome. This PCR-based test measures the number of CGG repeats to determine carrier status or affected status.
Who Should Consider Fragile X FMR1 Testing?
Children with developmental delay, intellectual disability, or autism spectrum features, particularly boys. Women with premature ovarian insufficiency (menopause before age 40) or a family history of Fragile X. Men over 50 with progressive tremor and ataxia (Fragile X-associated tremor/ataxia syndrome, FXTAS). Individuals with a family history of intellectual disability or Fragile X.
Normal alleles have 5-44 CGG repeats. Intermediate alleles (45-54 repeats) may be unstable but do not cause Fragile X. Premutation alleles (55-200 repeats) can cause FXTAS in older men and premature ovarian insufficiency in women. Full mutations (over 200 repeats) cause Fragile X Syndrome. Female carriers have a 50% chance of passing the expansion to each child.
A trained nurse collects the blood sample by standard venepuncture at our clinic on Old Brompton Road, directly opposite South Kensington tube station (Piccadilly, Circle, and District lines). A referral from a clinical geneticist is required — please call 020 7183 2362 to arrange.
Genetic Health Insights
Genetic testing provides insights into hereditary conditions and personalized health risks.
- Family history assessment
- Hereditary conditions
- Carrier screening
- Personalized medicine
- Risk assessment
- Family planning
How It Works
Book Online
Choose a convenient date and time
Visit Our Clinic
20 Old Brompton Road, South Kensington
Quick Blood Draw
Professional phlebotomy, 5 minutes
Get Results
Results in 5 weeks"
Frequently Asked Questions
Common questions about this blood test
Visit Our London Clinic
Central London location with excellent transport links
Address
South Kensington Medical & Dental
20 Old Brompton Road
South Kensington
London SW7 3DL
Getting Here
- 2-minute walk from South Kensington tube
- Circle, District & Piccadilly lines
Opening Hours
- Monday, Wednesday9am - 6pm
- Tuesday, Thursday9am - 8pm
- Friday8am - 5pm
- Saturday10am - 4pm
- Sunday10am - 4pm
Contact
Ready to Book Your Test?
No GP referral needed. Book online and get tested at our South Kensington clinic. Results within 5 weeks".
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Meet Our Medical Team
Our experienced medical team is fully qualified and registered with the GMC and NMC, delivering safe, high-quality care in line with the highest professional standards.
Because our patients deserve nothing less.
Registered. Regulated. Trusted.
At South Kensington Medical & Dental, we are fully registered with the Care Quality Commission (CQC) and our clinicians are registered with the relevant UK regulatory bodies, including the GDC and GMC. Our dentists, dental nurses and medical professionals deliver care that meets the highest clinical, safety and ethical standards, because our patients deserve nothing less.
