Final answer:
The nurse should instruct the client to drink clear liquids for 24 hr prior to the procedure and take nothing by mouth for 6 hr before the colonoscopy.
Step-by-step explanation:
The nurse should include the following instruction in the teaching for preparing for a colonoscopy: Drink clear liquids for 24 hr prior to the procedure, and then take nothing by mouth for 6 hr before the procedure.
This instruction is important because it helps to ensure that the colon is empty and clean for the procedure. Clear liquids are easier to digest and do not leave residue in the colon, allowing for a clear view during the colonoscopy.
By following these instructions, the client increases the chances of having an effective and accurate colonoscopy procedure.