FRAT Test & Folinic Acid Treatment

FRAT testing and folinic acid treatment for autistic children

One of the questions we are asked most often by parents of autistic children is about folinic acid — sometimes called Leucovorin (in the US) or Refolinon (in the UK) — and the related FRAT blood test. This is a specialist treatment we offer within our integrative paediatric service, and this page sets out our approach in plain English: what folinic acid is, what the Folate Receptor Antibody Test (FRAT) tells us, why we sometimes trial folinic acid without the test, what a carefully monitored trial involves, how it fits a wider plan, and what it can and cannot do. It is educational information, not medical advice.

What folinic acid is

Folinic acid is a prescription form of folate that crosses 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 do not reach the brain in the children most likely to benefit. In the UK the brand-name prescription is Refolinon; in the US it is commonly known as Leucovorin. The active ingredient is the same.

What the FRAT test tells us

The Folate Receptor Antibody Test (FRAT) 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, autism-spectrum traits and regressive symptoms. The test measures both blocking and binding antibodies.

Practically, the test is processed through a US-based lab, results typically take around 50 days (sometimes longer, and outside our control), and a blood draw is required in the UK through a third-party service. These practicalities matter, because they shape whether testing first is the right path for a particular child.

Why we may trial folinic acid without the test

Our rationale for not always requiring a FRAT test is centred on your child’s best interests. The blood draw itself can be extremely distressing and traumatic 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, and 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, with structured feedback from you at every review.
• Dosing: a weight-based protocol, never exceeding 50 mg/day even at higher weights (most children work up to around 2 mg/kg).
• 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 change 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

Folinic acid 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 do and do not know, and a trial is offered as a carefully monitored, evidence-informed step, not a promise.

How folinic acid fits the wider plan

Folinic acid is never offered in isolation. It sits within the same whole-child, integrative approach we take to holistic autism treatment — one plan that looks at the biology standard care so often overlooks. The folate-receptor and methylation pathways a folinic acid trial targets are part of a bigger picture that also includes the gut-brain axis, nutrient status, mitochondrial function and the nervous system. The reasonable goal is not to cure autism, but to optimise your child’s whole well-being and development as much as possible.

In practice, a folinic acid trial is frequently stacked with the clinic’s other pillars for a synergistic effect: functional medicine testing to map methylation and nutrient roadblocks, microbiome medicine and therapeutic diets to repair the gut, targeted nutraceuticals, and nervous system regulation. Because measurement matters when several things are done together, we track each child’s response over time using a validated autism rating tool at every monthly review, so both you and the medical team can see what is genuinely helping and adjust the plan.

Costs and practicalities

The main costs are for third-party services rather than the clinic, and are approximate — we confirm current figures with you before proceeding:

• FRAT test (optional): approximately $300 USD, paid directly to the US lab.
• Blood draw: approximately £60–80 through a third-party phlebotomy service.
• Medication: Refolinon is modestly priced (approximately £95 for 30 × 15 mg tablets at the time of writing).

Because turnaround and third-party pricing can change, please treat these as a guide and confirm current figures at your consultation.

Educational information about a specialist-prescribed treatment; not medical advice or a recommendation to use any specific medicine. Figures are approximate and subject to change.

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. Folinic acid is one option within a wider, personalised plan — you can read more about our approach to neurodivergent children and holistic autism treatment.

Who leads this treatment

FRAT testing and folinic acid treatment are delivered by our specialist paediatric team, part of the wider integrative service led by Dr Dani Gordon. Every trial is doctor-led, carefully monitored and reviewed monthly. All paediatric consultations are online, so your child is seen from home — no waiting rooms, no sensory overload, no school missed.

Frequently asked questions

The Folate Receptor Antibody Test screens for autoantibodies that block folate from reaching the brain — the cause of cerebral folate deficiency, which has been linked to developmental, speech, motor and autism-related symptoms. It measures both blocking and binding antibodies and is processed through a US-based lab.

Not necessarily. Because the blood draw can be very distressing for autistic children, the test is slow and costly, and some FRAT-negative children still benefit, we often offer a carefully monitored therapeutic trial of folinic acid instead — with monthly reviews using a validated rating tool.

No. Folinic acid is not a cure. Some children show meaningful improvement, particularly in communication, but the response varies and we are always honest about what is and isn’t known.

It has a strong safety profile. Side effects are rare and may include temporary irritability or sleep changes, and no blood monitoring is needed unless there is pre-existing liver or kidney disease. We prescribe the brand-name Refolinon as the first choice.

The first step is a paediatric consultation, where we take a full history and decide together whether to test first or begin a monitored folinic acid trial. All paediatric consultations are online, so your child is seen from home.

Integrative paediatric medicine, delivered by specialist doctors

• A compassionate, child-first approach. We avoid distressing testing where a carefully monitored trial is the kinder, clinically appropriate path.
• Honest about the evidence. Folinic acid is not a cure — we are clear about what is and isn’t known.
• Specialist paediatric expertise. Led by Dr Dani Gordon with a dedicated paediatric team, including a lead clinician for FRAT testing and folate medication.
• Seen from home, online. No waiting rooms, no sensory overload, no school missed.