Understanding Autism and FRAT Test: Common Questions Parents Ask
What is autism?
Autism (or Autism Spectrum Disorder) is a condition that affects how a child communicates, interacts with others, and behaves. Some children may have difficulty with speech or social skills, while others may have repetitive behaviors or strong preferences for routines. Every child with autism is different, which is why it is called a “spectrum.”
How common is autism?
Autism is quite common today. About 1 in 36 children are diagnosed with autism according to the Centers for Disease Control and Prevention. This means most schools will have at least a few children with autism.
What is cerebral folate deficiency (CFD), and how is it related to autism?
Folate is a vitamin (Vitamin B9) that is important for brain development. In some children, the brain does not get enough folate even if blood levels are normal. This is called cerebral folate deficiency (CFD).
In some children with autism, the body produces antibodies that block folate from entering the brain. This may affect development, behavior, sleep, or learning in a small group of children.
How common is this folate problem in children with autism?
Some studies suggest that up to half of children with autism may have these folate-blocking antibodies. However, not all of them have a true deficiency in the brain, and not all need treatment. So, this is still an area of ongoing research.
What is FRAT test?
FRAT (Folate Receptor Antibody Test) is a blood test that detects folate receptor alpha autoantibodies (FRAA).
These antibodies can:
- Block folate transport into the brain
- Lead to low brain folate levels despite normal blood folate
Cause or contribute to cerebral folate deficiency (CFD)
How common is FRAT positivity in autism?
- About 50-71% of children with ASD have at least one FRA antibody positive
- So in 1000 children with ASD, Approximately 700 children will be positive for FRAT
When should my child be tested (FRAT test)?
The folate receptor antibody test (FRAT) is not needed for every child with autism. It may be considered if your child has:
- Loss of skills (regression), especially after early normal development
- Seizures
- Sleep problems or unusual irritability
- Movement problems or low energy
- Poor progress despite therapy
Your doctor will decide based on your child’s history.
If the test is positive, what does it mean?
A positive test means your child has antibodies that may interfere with folate reaching the brain. It does not always mean there is a definite problem, but it suggests that treatment may help.
Do all children with FRAT test positivity have this CFD?
No — not all children with a positive FRAT test have cerebral folate deficiency (CFD).
The FRAT test detects antibodies against the folate receptor, but:
- It shows a possible mechanism (autoantibodies interfering with folate transport)
- It does not prove that the brain folate level is actually low
How do doctors confirm this condition?
The most accurate way is to check folate levels in the brain using a spinal fluid test (lumbar puncture). However, since this test is invasive, many doctors may choose to try treatment directly if the blood test is positive and symptoms match.
Is there a genetic test for this?
In rare cases, a genetic problem (called FOLR1 deficiency) can cause this condition. Genetic testing can confirm this, but it is uncommon. Most children with autism and folate issues do not have this genetic condition.
Does every child with autism need this test?
No. Routine testing is not recommended for all children with autism. It is usually done only in selected cases where there are additional symptoms or concerns.
Is there treatment if this problem is found?
Yes. Doctors may prescribe folinic acid (a special form of folate) which can help improve symptoms in some children, especially if the test is positive. Response varies from child to child.
If you’re considering this test or treatment, it’s best to discuss it with your child’s neurologist or developmental pediatrician to see if it is appropriate for your child.
Featuring insights from Dr K Ananthanarayanan, Paediatric Neurologist, Apollo Children's Hospitals, Chennai
Best Hospital Near me Chennai
