Fluorine F 18 Azafol

**Semantic type:** Indicator, Reagent, or Diagnostic Aid|Pharmacologic Substance

**Definition:** A radioconjugate containing a folic acid receptor (FR; folate receptor) tracer labeled with fluorine F 18, with potential use for FR-expressing tumor imaging using positron emission tomography (PET). Upon administration of fluorine F 18 azafol, the azafol moiety selectively targets and binds to FR. This allows the visualization of tumor cells expressing FR using PET. FR is overexpressed on certain tumor cell types.

**Synonyms:** - 3'-Aza-2'-[(18)F]fluorofolic Acid - [18F]-azafol