| 6-GSI | 6-item Gastrointestinal Severity Index |
| AA | Arachidonic Acid |
| ABC | Aberrant Behavior Checklist |
| ADHD | Attention Deficit Hyperactivity Disorder |
| ADOS | Autism Diagnostic Observation Schedule |
| AGG | Aggressiveness |
| AROUSE | Arousal Regulation Problems |
| ASD | Autism Spectrum Disorder |
| ASU | Arizona State University |
| ATEC | Autism Treatment Evaluation Checklist |
| ATP | Adenosine Triphosphate |
| BMI | Body Mass Index |
| BUN | Blood Urea Nitrogen |
| CARS-2 | Childhood Autism Rating Scale 2 |
| CBC | Complete Blood Count |
| CGI | Clinical Global Impressions |
| CLIA | Clinical Laboratory Improvements Amendments |
| CRP | C-Reactive Protein |
| DGLA | Dihomo-Gamma-Linolenic Acid |
| DHA | Docosahexaenoic Acid |
| EFA | Essential Fatty Acids |
| EPA | Eicosapentaenoic Acid |
| GABA | Gamma-Aminobutyric Acid |
| GFCF | Gluten-Free, Casein-Free |
| GLA | Gamma-Linolenic Acid |
| HGCSF | Healthy Gluten-Free Casein-Free Soy Free |
| IRB | Institutional Review Board |
| LC-MS/MS | Liquid Chromatography Tandem Mass Spectrometry |
| LMRL | Learning, Memory, and Receptive Language |
| MCV | Mean Corpuscular Volume |
| n.s. | Not Significant |
| NADH | Nicotinamide Adenine Dinucleotide |
| NADPH | Nicotinamide Adenine Dinucleotide Phosphate |
| PDD-BI | Pervasive Developmental Disorders Behavior Inventory |
| PDD-NOS | Pervasive Developmental Disorder-Not Otherwise Specified |
| PGI-2 | Parent Global Impressions-2 |
| PUFA | Polyunsaturdated Fatty Acid |
| RBC | Red Blood Count |
| RIAS | Reynolds Intellectual Assessment Scales |
| S.D. | Standard Deviation |
| SAM | S-Adenosylmethionine |
| SAS-Pro | Severity of Autism Scale |
| SEMPP | Semantic/Pragmatic Problems |
| SOCPP | Social Pragmatic Problems |
| SRS | Social Responsiveness Scale |
| SSP | Short Sensory Profile |
| VABS-II | Vineland Adaptive Behavior Scale II |