| ICP-MS | inductively coupled plasma mass spectrometry [or spectrometer] |
|---|---|
| FIR | far infrared; fold increase in resistance |
| FTIR | Fourier-transformed infrared; functional terminal innervation ratio |
| IF | idiopathic fibroplasia; idiopathic flushing; immersion foot; immunofluorescence; indirect fluorescen... |
| IFR | infrared; inspiratory flow rate |