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In observance of Thanksgiving, please be advised that our lab will be CLOSED on Thursday, November 23rd, and Friday, November 24th.

The lab will re-open on Monday, November, 27th. If you are sending samples, please ensure that they are received before November 23rd, or after November 27th. Thank you and enjoy the holiday!

Folate Receptor Antibodies (FRA)


Iliad's FRAT® measures the presence of antibodies that interact (either block or bind) with the activity of the Folate Receptor A (FRA). FRA is responsible for the transport of folate - and its active component 5-MTHF which helps metabolize folate - into certain tissues, most notably the brain, placenta and ovary. These antibodies were detected in the blood of numerous individuals with disorders ranging from Cerebral Folate Deficiency, Autism Spectrum Disorders, sub-fertility in women, and pregnant women carrying fetuses with neural tube defects (NTD). Additionally, antibodies have been found in the parents of some children with ASD.

Current evidence suggests that these antibodies may be responsible for reducing the transport of folate and its active metabolites (most notably 5-MTHF) across barriers to the brain, placenta and ovaries. Data show that folate is critical for the proper function of many tissues, including brain, placenta and ovaries.


FRAT® is not indicated for the diagnosis of any medical condition and thus has not been approved by the FDA. FRAT® can be useful as a research tool in the above disorders, as well as assessing the health of folate transport to the brain, placenta and ovary. The levels of antibodies tend to fluctuate over time and diet (e.g. milk intake) can affect the levels.

In several cases with CFD related disorders and ASD, the administration of metabolites of folate, such as 5-MTHF and Folinic acid, has resulted in clinical improvements. This is because these metabolites can enter the brain through carriers other than FRA, most notably the RFC (Reduced Folate Carrier).

For more information and supporting data please review our Publications page.


Why FRAT® Testing Is Important

A substantial number of children with ASD generate antibodies to the receptor responsible for allowing folate to enter the brain. These antibodies can block the entry of folate to the brain resulting in cerebral folate deficiency (CFD). The presence of such antibodies, which FRAT® measures, is an indication that folate needs to be delivered in different ways (bypassing the blocked receptor) to enter the brain. One such substance, called Folinic acid, when administered to children with ASD, increases the levels of active folate metabolites and leads to clinical improvements in these patients.

“The association of FRA Autoantibodies with pregnancy-related complications,
CFD syndrome, and autism spectrum disorders and response to folate therapy is
highly suggestive of the involvement of these Autoantibodies in the disruption of
brain development and function via folate pathways.

Because these Autoantibodies are associated with various pathologies during
fetal and neonatal development, early detection and intervention could prevent
or reverse the consequences of exposure to these Autoantibodies.”

- Jeffrey M. Sequeira et al., The diagnostic utility of folate receptor autoantibodies in blood Clin Chem Lab Med 2013; 51(3): 545-554

For Physicians Requesting Sample Testing

  • If you are a physician and would like to submit samples please click the link below to access our FRAT® LABORATORY TEST FORM.

     Click here to download FRAT® LABORATORY TEST FORM. 

For Physicians Requesting a FRAT® Test Kit

  • If you are a physician and would like to order a FRAT® Kit please click the link below

     Click Here to ORDER A FRAT® Kit.

For Patients Requesting a FRAT® Test Kit

  • If you are a patient and would like to order a FRAT® Kit please click the link below. Please note that all test results must be sent to your physician. Please discuss this test with your physician prior to ordering.

     Click Here to ORDER A FRAT® Kit.