| FTM | fluid thioglycolate medium; fractional test meal |
|---|---|
| FTR | fractional tubular reabsorption |
| FU | fecal urobilinogen; fetal urobilinogen; fluorouracil; follow-up; flux unit [ion]; fractional urinaly... |
| FiO2 | fractional in-spired oxygen concentration |
|---|---|
| FIO2 | fractional inspired O2 concentration |