Guide

No, fasting for a testosterone blood test is not always required, but a morning sample and your provider’s instructions keep results dependable.

CMP fasting rules vary by lab, but many orders still ask you to avoid food for 8–12 hours while you may drink plain water.

Most adults can have a nonfasting cholesterol blood test, but your clinician may ask you to fast 9–12 hours if they need accurate triglyceride levels.

Most PSA blood tests do not require fasting, but always follow the specific instructions from your doctor or lab.

Yes, fasting is usually needed before many blood sugar checks that diagnose diabetes, while some random tests are done without any fasting.

No, most people do not need to give up food or drinks before this routine blood count check unless their lab gives different directions in general.

Yes, fasting is usually required for a basic metabolic panel when glucose is included, but your lab or doctor will tell you if fasting is not needed.

No, you do not always need to fast for a CT scan, but fasting is common when contrast dye or abdominal imaging is planned.

No, PSA blood tests usually do not require fasting, though your clinic may give extra instructions about food, medicines, sex, or exercise.

No, you usually do not need to fast for a TSH blood test unless other fasting labs are ordered at the same time.