Test library
Fragile X Carrier Screen
Fragile X carrier testing uses a DNA blood test to determine whether a person carries a change in the FMR1 gene linked to fragile X syndrome. It helps assess the chance of passing the condition to future children.
Order Fragile X Carrier Testing
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Fragile X Carrier Testing- Typical turnaround
- 1-3 business days
- Starting price
- From $399
- Results
- Confidential, online
Quick answer
Fragile X carrier testing examines the FMR1 gene for the repeat expansion that causes fragile X syndrome and related conditions. It is typically offered to people with a family history, a personal history of certain reproductive concerns, or symptoms that raise suspicion. The test identifies carriers and helps inform reproductive planning with a qualified healthcare provider.
What this test measures
Fragile X syndrome is a genetic condition caused by an expansion of a repeated DNA sequence in the FMR1 gene. When the expansion is large enough, the gene does not function normally, which can lead to intellectual disability and other features. A smaller expansion, called a premutation, does not usually cause fragile X syndrome but can be passed on and expand in the next generation.
The test analyzes DNA from a blood sample to measure the size of the FMR1 repeat region and classify it as normal, premutation, or full mutation. Because the inheritance pattern is X-linked, the implications differ for men and women. Genetic counseling is strongly recommended so that results can be explained in the context of family planning.
Carrier testing does not diagnose a person with fragile X syndrome; it identifies whether a person carries an expansion that could be passed on. Results can also reveal premutation-related risks, which is one reason professional counseling accompanies the test. A qualified healthcare provider or genetic counselor interprets the findings.
- FMR1 gene CGG repeat size
- FMR1 premutation status
- FMR1 full mutation status
- Methylation status of FMR1 when indicated
- AGG interruption pattern when reported
- Carrier status classification
Why people order this test
- Evaluate a family history of fragile X syndrome or intellectual disability
- Assess reproductive risk before or during pregnancy
- Investigate unexplained developmental concerns in a family member
- Determine premutation carrier status
- Inform family planning discussions with a genetic counselor
- Follow up when a relative has a known FMR1 expansion
How to prepare
No fasting is required for this test. A blood sample is collected from a vein, usually at the arm. Some testing programs recommend genetic counseling before or after the test to explain the results.
Understanding your results
Results are typically available within one to three business days after the laboratory receives the sample. The report classifies the FMR1 repeat as normal, premutation, or full mutation. A qualified healthcare provider or genetic counselor explains what the result means for the individual and family.
Fragile X Carrier Screen by state
Alabama
Fragile X Carrier Screen across Alabama.
Alaska
Fragile X Carrier Screen across Alaska.
Arizona
Fragile X Carrier Screen across Arizona.
Arkansas
Fragile X Carrier Screen across Arkansas.
California
Fragile X Carrier Screen across California.
Colorado
Fragile X Carrier Screen across Colorado.
Connecticut
Fragile X Carrier Screen across Connecticut.
Delaware
Fragile X Carrier Screen across Delaware.
Florida
Fragile X Carrier Screen across Florida.
Georgia
Fragile X Carrier Screen across Georgia.
Hawaii
Fragile X Carrier Screen across Hawaii.
Idaho
Fragile X Carrier Screen across Idaho.
Related tests
12 Panel Drug Test (Drugs of Abuse Testing), Hair
Compare 12 Panel Drug Test (Drugs of Abuse Testing), Hair options and order online.
12 Panel Drug Testing
Compare 12 Panel Drug Testing options and order online.
7 Panel Drug Test (Drugs of Abuse Testing), Hair
Compare 7 Panel Drug Test (Drugs of Abuse Testing), Hair options and order online.
9 Panel Drug Test
Compare 9 Panel Drug Test options and order online.
9 Panel Drug Test (Drugs of Abuse Testing), Hair
Compare 9 Panel Drug Test (Drugs of Abuse Testing), Hair options and order online.
Frequently Asked Questions
What is fragile X syndrome?
It is a genetic condition caused by an expansion in the FMR1 gene that affects development and learning. It is inherited in an X-linked pattern.
Who should consider fragile X carrier testing?
It may be offered to people with a family history of fragile X syndrome or related conditions, those with certain reproductive concerns, or when a provider suspects an FMR1 expansion.
How is the test performed?
A blood sample is collected from a vein and the DNA is analyzed to measure the size of the FMR1 repeat region.
Does carrier testing mean I have fragile X syndrome?
No. Carrier testing identifies whether a person has an expansion in the FMR1 gene. Carriers may not have fragile X syndrome themselves but can pass the expansion on.
Is genetic counseling recommended?
Yes. Because results can affect family planning and relatives, genetic counseling is commonly recommended to explain the implications.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
Reviewed by the LabOrdering Editorial Team
Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.