FRAT testing, folinic acid and autism in children
One of the most-asked-about treatments in autism care — explained in plain English, as part of whole-child integrative and functional medicine.
Folate, the brain, and autistic children
If you’re reading this, you’re probably weighing up folinic acid for your child.
Perhaps you’ve read about it online, heard it mentioned in a parent group, or been told about the FRAT test and weren’t sure what to make of it. There is a lot of noise — some of it overblown, some of it dismissive. This guide sets out our honest clinical position.
Folinic acid is one of the most-asked-about treatments in autism care, and for some children it makes a meaningful difference to communication, mood and sleep. It is not a cure, and it is not right for every child. What follows is how we assess it, when we trial it, what the FRAT test does and doesn’t tell us, and how it fits into a wider, whole-child plan.
Testing, not guessing
Where standard NHS testing uses a narrow set of blood markers that often come back “normal,” functional testing looks at how your child’s body is actually working — the microbiome, methylation and folate pathways, mitochondrial function and nutrient status. We use it to find the specific roadblocks slowing your child down, then treat what we find. Every test we order is chosen because the result will change something in the plan — including, where indicated, the FRAT test.
FRAT testing & folinic acid, in plain English
What folinic acid is
Folinic acid is a prescription form of folate that can cross into the brain effectively even when folate receptor antibodies are blocking it. It is not the same as the folic acid or methylfolate you can buy in a supplement — those don’t reach the brain in the children most likely to benefit. In the UK the brand-name prescription is Refolinon; in the USA it is commonly known as Leucovorin. The active ingredient is the same.
What the FRAT test tells us
The Folate Receptor Antibody Test screens for autoantibodies that block or bind folate from reaching the brain. Cerebral folate deficiency — caused by these antibodies — has been linked to developmental delays, speech and language difficulties, seizures, motor coordination problems, autistic traits and regressive symptoms.
- The test is processed through a US-based lab and costs approximately $300, paid directly to the lab.
- It measures both blocking and binding antibodies.
- Results typically take around 50 days, sometimes longer. We have no control over the turnaround time.
- A blood draw in the UK costs an additional £60–80 through a third-party service.
Why we may trial folinic acid without the test
Our clinical rationale for not always requiring a FRAT test is centred on your child’s best interests. The blood draw itself can be extremely distressing for autistic children. The test is expensive, has a long turnaround time, and we have repeatedly encountered samples spoiled in transit through customs delays — leading to the need for a second, equally stressful blood draw.
Recent research also shows that some FRAT-negative children still benefit from folinic acid, due to other pathway issues affecting folate transport into the brain. The medication itself has a strong safety profile. For many families, a carefully monitored therapeutic trial is the more compassionate and clinically appropriate path than basing treatment on a test that is often problematic to obtain.
What a trial looks like
- Initial trial period: usually 3 months
- Monitoring: monthly clinical reviews using a validated autism rating tool
- Dosing: a weight-based protocol, never exceeding 50 mg/day even at higher weights (most children work up to about 2 mg/kg)
- Parent feedback: structured input from you at every review
- Extension: where there is a small but possible improvement and the medication is well tolerated, we may extend the trial for another 3 months
Improvements typically emerge gradually over weeks. Some children respond quickly; others show gradual changes over months. Side effects are rare but may include temporary irritability or sleep changes. No blood monitoring is necessary unless your child has pre-existing liver or kidney disease.
What folinic acid is not
It is not a cure for autism. The chance of a completely non-verbal child gaining major language milestones is unknown and likely not the norm — though some children in the preliminary research have gained significant milestones. We are honest about what we know and don’t know.
A note on shared care
Because integrative paediatric medicine is not yet NICE-approved in the UK, NHS clinicians will generally not accept shared care for folinic acid. We will, however, always keep your NHS team informed of any medication changes as part of our duty of care.
What it costs
- Initial paediatric consultation: £399 (60-minute online assessment with Dr Pram Mainie)
- FRAT test (optional): approximately $300 USD, paid direct to the US lab
- Blood draw: £60–80 through a third-party service
- Medication (folinic acid / Refolinon): approximately £95 for 30 × 15 mg tablets
- Trial follow-ups: £195 each, monthly during the initial 3-month trial
Ready to start? Talk to Dr Mainie about a folinic acid trial
Most families we see have already done their research and know they want to explore folinic acid. If that is you, the fastest next step is an initial consultation — we will review your child, decide together whether the FRAT test or a monitored trial is right, and start straight away.
Whole-child integrative medicine for autism
The London Resilience Clinic is an evidence-based integrative and functional medicine clinic. We do not view autism as a disease to be cured — we view it as a unique neurotype that can come with very real, overlapping physical and mental-health conditions that standard care often misses or struggles to support.
Folinic acid and FRAT testing are one part of that wider picture. We only ever consider them alongside a full assessment of your child’s biology — the gut-brain-immune axis, methylation, nutrient status, sleep and nervous system — so that folate support is used where it genuinely fits, not in isolation.
Why standard care often falls short
Most parents reach us after years of fragmented appointments — one clinician for sleep, another for the gut, a third for behaviour — none looking at the full biological picture, and folate-pathway issues rarely considered at all.
| Standard Care | The LRC Approach |
|---|---|
| Same prescription for the same diagnosis | Personalised to biochemistry, brain and nervous system |
| Narrow blood tests, often “normal” | Functional testing of microbiome, methylation and folate pathways |
| Folate-pathway issues rarely considered | FRAT testing and folinic acid trials where indicated |
| One specialist per symptom, no shared plan | One integrated plan across every symptom cluster |
Autism, methylation and cerebral folate deficiency
Several interconnected biological differences are common in autistic children. Folate is one important thread — but it sits within a wider web.
Methylation and the folate cycle.
Methylation acts as the biochemical “gears” of the body, controlling neurotransmitter production, cellular energy and detoxification. A high proportion of autistic children have genetic variations (such as MTHFR) that make these gears stick, which can affect the production of serotonin and melatonin — driving sleep disturbance and anxiety.
Cerebral folate deficiency.
This is a specific situation where the brain is starved of folate despite normal blood levels, often because folate receptor autoantibodies block folate from crossing into the brain. It has been linked to speech and language difficulties, developmental delay, motor problems and autistic traits — and it can be assessed with the FRAT test and supported with folinic acid.
Gut-brain-immune axis.
Microbes in the gut produce chemicals that directly influence brain function, mood and behaviour. Dysbiosis and intestinal permeability drive inflammation that can worsen symptoms and interact with folate metabolism.
Mitochondrial demand.
The autistic brain has high energy needs. When the cellular “power plants” cannot keep up, the result can be deep fatigue that is easily mistaken for “laziness” or “defiance.”
The doctors who will care for your child
Dr Pram Mainie
Our integrative and functional-medicine paediatrician, who leads the clinic’s FRAT testing and folinic acid programme. He specialises in whole-child care for autism, ADHD and complex paediatric conditions, and is known by families for listening carefully and explaining complex results clearly.
Dr Dani Gordon
Double board-certified integrative medicine physician with over a decade caring for thousands of neurodivergent patients. She has spoken at the UN, advised on national policy, and featured in the BBC, The Sunday Times and The Guardian.