| Abbreviation | Definition |
|---|---|
| FAS | Foetal Alcohol Syndrome |
| FAS | Fragile Accelerator Syndrome |
| FASAT | Fetal Alcohol Syndrome Assistance and Training |
| FASD | Fetal Alcohol Syndrome Disorder |
| FASPS | Familial advanced sleep phase syndrome |
| FASQ | Fetal Alcohol Syndrome Questionnaire |
| FASSY | Fetal Alcohol Syndrome Society of Yukon |
| FASSY | Fetal Alcohol Syndrome Society Yukon |
| FCS | Familial Chylomicronemia Syndrome |
| FDST | Foyle Down Syndrome Trust |
| FFS | Femoral Facial Syndrome |
| FGPS | Family Guy Personality Syndrome |
| FHCS | Fitz Hugh Curtis syndrome |
| FHS | False Hope Syndrome |
| FIS | Foal Immunodeficiency Syndrome |
| FLS | Fatty Liver Syndrome |
| FNS | Flared Nostril Syndrome |
| FODS | Field of Dreams Syndrome |
| FRPS | Familial Rectal Pain Syndrome |
| FSS | Flat Surface Syndrome |