IF

• idiopathic fibroplasia;

• idiopathic flushing;

• immersion foot;

• immunofluorescence;

• impact factor;

• indirect fluorescence;

• inferior facet;

• infrared;

• inhibiting factor;

• initiation factor;

• instantaneous flow;

• instantaneous frequency [ECG];

• integrate and fire [neuron];

• intensifying factor;

• interbody fusion;

• interferon;

• intermediate filament;

• intermediate frequency;

• internal fixation;

• interstitial fluid;

• interventional fluoroscopy;

• intrinsic fac-tor;

• involved field [radiotherapy]