An Investigation of the Dynamic Thiol/Disulfide Homeostasis, As a Novel Oxidative Stress Plasma Biomarker, in Children With Autism Spectrum Disorders.
A five-minute plasma test can flag autism risk, yet it won’t tell you how hard to program therapy.
01Research in Context
What this study did
Doctors took a small blood sample from children with autism and from typical peers.
They measured two tiny chemicals: thiol and disulfide. These show how well the body handles oxidative stress.
The team wanted to know if the balance of these chemicals could flag autism risk.
What they found
Kids with autism had lower thiol and higher disulfide than controls.
The blood test could tell who had autism, but it did not link to how severe the symptoms were.
How this fits with other research
Heuer et al. (2008) and Agiovlasitis et al. (2025) also used blood tests to spot autism. Their markers linked to severity; this one did not. The difference is likely because oxidative stress is a body state, not a brain-symptom dial.
Thapa et al. (2019) showed adults with autism have lower heart rate variability. Together, these papers tell us the body gives off simple signals across the lifespan.
Liu et al. (2025) found vitamin levels tied to autism severity. Combining vitamin panels with oxidative markers may give a fuller picture than either alone.
Why it matters
You can’t judge symptom severity with this test, but you can get a quick red flag before starting ABA. A low thiol result can prompt diet or medical follow-up that may improve learning readiness. Keep an eye on future kits that bundle oxidative and vitamin panels for clearer guidance.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Ask parents if the child has ever had oxidative-stress labs; share results with the pediatrician before intensive sessions start.
02At a glance
03Original abstract
We aimed to investigate the role of impaired oxidant-antioxidant homeostasis on the etiopathogenesis of autism with a novel oxidative stress (OS) marker, dynamic thiol/disulfide homeostasis (DTDH), and relationship between the symptom severity and markers. A total of 60 children with ASD aged 3-10 years and 54 unaffected children were investigated for the plasma DTDH parameters. A sociodemographic-data form, K-SADS-PL, Childhood Autism Rating Scale, Abnormal Behavior Checklist, Autism Behavior Checklist, and a developmentally appropriate IQ test were administered to all participants. Distortion of DTDH to the OS-side in the autism group was determined with lower plasma levels of native and total thiol, in contrast to a higher disulfide and thiol oxidation-reduction ratio. However, biomarkers had no correlation with the symptom severity of autism. Cutoff values for each parameter on the ROC curve might be useful to predict ASD and each DTDH biomarker was detected as an independent predictor of ASD. The present study demonstrated a disturbed redox status and absence of an expected compensatory increase in antioxidant response in a pediatric sample of ASD by measuring dynamic oxidation/reduction shifts with a novel, practical and reproducible analytical technique, and contributes to data regarding oxidative hypothesis on autism and raises the question of the place of antioxidants in autism treatment. Our results may suggest predictive usefulness of the plasma DTDH biomarkers in ASD, despite the study being conducted with a modestly small sample size that makes further research with a larger replication sample necessary to substantiate the findings. LAY SUMMARY: Dynamic thiol/disulfide homeostasis is a novel plasma marker used to determine the oxidative stress which is a natural result of disequilibrium between the oxidants and antioxidants in the human body. There is increasing interest regarding a central biological linking role of oxidative stress among the other etiological factors of autism. Our findings on the disturbed plasma dynamic thiol/disulfide homeostasis in children with autism and the absence of an expected antioxidant response against increased oxidative stress supports the data concerning the role of oxidative stress on the etiology of autism and the need of further research on the place of antioxidants in autism treatment.
Autism research : official journal of the International Society for Autism Research, 2021 · doi:10.1002/aur.2436