| HF | Hageman factor; haplotype frequency; hard filled [capsule]; hay fever; head of fetus; head forward; ... |
|---|---|
| LFT | latex fixation test; latex flocculation test; left fronto-transverse [fetal position]; liver functio... |
| FFF | degree of fineness of abrasive particles; field-flow fractionation; flicker fusion frequency |
| FTC | Federal Trade Commission; follicular thyroid carcinoma; frequency threshold curve; frequency tuning ... |
| HFO | high-frequency oscillator; high-frequency oscillatory [ventilation] |