Guide

Before wisdom teeth surgery with sedation, you usually stop eating for six hours or more and follow the exact fasting schedule your surgeon gives you.

Most basic metabolic panels do not strictly require fasting, yet many labs still request 8–12 hours without food for clearer glucose results.

Most CT scans only need fasting for a few hours when contrast is used, and your imaging center gives the exact timing for food and drink.

No, most modern cholesterol tests work without fasting, though some clinics still ask you to skip food for 9–12 hours for a full lipid panel.

No, you do not always need to fast before a CT scan; fasting is usually needed only for contrast studies of the abdomen or pelvis.

Most adults are asked to fast 8–12 hours before a CMP blood test so glucose and related results reflect a true baseline.

Yes, many glucose tests check fasting levels, but some screenings and random checks use your blood sugar without any special food restrictions.

Most people do not need to fast before a PSA blood test, unless the lab also orders fasting for other blood work at the same visit.

No, sickle cell blood tests usually do not require fasting unless your lab combines them with other fasting labs.

Most people do not need to fast before a PSA blood test, but you should follow any specific instructions from your own clinic or lab.