| Abbreviation | Meaning |
|---|---|
| Fx | fracture |
| FA | Fanconi anemia |
| FAMMM syndrome | familial atypical multiple mole melanoma syndrome |
| FANA | fluorescent antinuclear antibody test |
| FAP | familial adenomatous polyposis |
| FAST | focused assessment with sonography for trauma |
| FB | foreign body |
| FBC | Family Birth Center full blood count |
| FBE | full blood exam |
| FBG | fasting blood glucose |
| FBS | Failed back syndrome fasting blood sugar |
| F/C | fevers and/or chills |
| F/C/S | fevers and/or chills and/or sweating |
| FCS | Faciocutaneoskeletal syndrome |
| FDC | follicular dendritic cells |
| FDG | fluordeoxyglucose |
| FDIU | fetal demise in utero |
| FDP | fibrin degradation product Flexor digitorum profundus |
| FDS | Flexor digitorum superficialis |
| Fe | iron |
| FEF25–75 | forced expiratory flow at 25–75% of forced vital capacity |
| fem | female femoral |
| FEN | Fluids, Electrolytes, Nutrition |
| FEP | free erythrocyte protoporphyrin fibroepithelial polyp |
| FESS | functional endoscopic sinus surgery |
| FET | frozen embryo transfer |
| FEV1 | forced expiratory volume in 1 second |
| FF | free fluids (non-thickened fluids) |
| FFA | free fatty acids |
| FFP | fresh frozen plasma |
| FHR | fetal heart rate |
| FHS | fetal heart sound |
| FHT | fetal heart tones |
| FHx | family history (in medicine, meaning specifically the medical histories of family members and ancestors) |
| FIBD | found in bed dead |
| FISH | fluorescence in situ hybridization |
| FL | femur length |
| FLAIR | fluid attenuated inversion recovery |
| FLK | funny-looking kid (slang reference to dysmorphic features) |
| fl.oz. | fluid ounce (1 Imperial fluid ounce ≈ 28.4 mL; 1 U.S. fluid ounce ≈ 29.6 mL) (use of these units is generally deprecated in modern medicine in favor of mL) |
| FM | fetal movement |
| FMF | fetal movements felt |
| FMP | first menstrual period (that is, menarche) |
| FMPP | Familial male precocious puberty |
| fMRI | functional magnetic resonance imaging |
| FMS | Fibromyalgia Syndrome |
| F→N | finger-to-nose test (one simple clinical test of motor coordination) |
| FNA | fine-needle aspiration |
| FNAB | fine-needle aspiration biopsy |
| FNAC | fine-needle aspiration cytology |
| FNC | full nursing care |
| FND | Functional neurologic disorder |
| FNH | focal nodular hyperplasia |
| FOB | Foot of Bed, father of baby, Fiberoptic Bronchoscopy |
| FOBT | fecal occult blood test |
| FOF | found on floor (patient fell out of bed) FOP Fibrousdysplasia ossificans progressiva |
| FOS | full of stool |
| FOOSH | fall on outstretched hand |
| FP | Family Planning |
| FPG | fasting plasma glucose |
| FRDA | Friedreich's ataxia |
| FROM | full range of motion |
| FSBS | finger-stick blood sugar (one method of blood glucose monitoring) |
| FSE | fetal scalp electrode |
| FSGS | focal and segmental glomerulosclerosis |
| FSH | follicle-stimulating hormone |
| FTA | fluorescent treponemal antibody (see syphilis) |
| FTA-ABS | fluorescent treponemal antibody absorption (see syphilis) |
| FtM | Female to Male transgender person (Trans Man) |
| FTT | failure to thrive |
| F/U | follow-up |
| FUE | Follicular Unit Extraction |
| FUT | Follicular Unit Transplantation |
| FUO | fever of unknown origin |
| FVC | forced vital capacity (spirometry test value used in assessment of chronic obstructive pulmonary disease) |
| FWB | full weight bearing, fetal wellbeing |
| FWD | full ward diet; forward |
| Fx | fracture; fraction |
| fxn | function |