The patient cannot have anything to eat 6 hours prior to the exam.

RENAL ARTERY ULTRASOUND

The patient must not have anything to eat or drink after midnight

RENAL &  BLADDER ULTRASOUND

Drink 16 ounces of water 1 hour prior to exam.  The patient cannot void one hour prior to the exam. 

CAROTID, PERIPHERAL VASCULAR (arterial/venous), THYROID

There are no necessary preparations.