Does having biopsy invalidate the fast? Does a biopsy break the fast? Is a biopsy considered invalidating the fast? Does getting a biopsy interrupt the fast?
Resection from any part of the body with the purpose of analysis (biopsy) does not invalidate the fast. (Decision by HBRA dated 22.09.2005; see. Marghinani, al-Hidayah, II, 263-264; Kasani, Bada’i, II, 98)
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS