| ff- | fertility inhibition negative |
|---|---|
| IBIDS | ichthyosis-brittle hair-impaired intelligence-decreased fertility-short stature [syndrome] |
| IFA | idiopathic fibrosing alveolitis; immunofluorescence assay; immunofluorescent antibody; incomplete Fr... |
| NFC | National Fertility Center |
| NFS | National Fertility Study; no fracture seen |