A patient was instructed not to eat for twelve hours before coming to the hospital for a procedure. What is the most likely reason for these instructions?

FBS means fasting blood sugar, a blood test used to help check for diabetes. Avoiding food for about 12 hours helps ensure the blood sugar result reflects a fasting level rather than a recent meal. MRCP is an imaging procedure, not a test for diabetes.

AI-written and checked against the verified answer.