colonoscopy

Dear Doctor, My Mom of 80 is due to undergo a Colonoscopy at 4p.m. in the afternoon. According the hospital handout, she heeds to start the preparation at 4p.m. the day before(24 hrs!) Is this logical? When she lived abroad she took the preparation the night before she had a morning Colonscopy? Thanks!

DEAR KEREN WE RECOMMEND TOTHE AFTER NOON SESSION TO TO START 24 H PRIOR