What is a hydrascan?

I have to hold one tomorrwo and i dont kjnow what it is! can some one please tell me what it is! what they do , i am so nervous
Answer:

Does anyone know a great website other later WebMD?

I am guessing you are having a HIDA scan. Here is some more information:

A hepatobiliary iminodiacetic acerbic (HIDA) scan helps evaluate the function of the gallbladder and the bile ducts. Doctors may also refer to this procedure as cholescintigraphy.

In preparation for a HIDA scan, a dye or other chemical (radioactive tracer) is injected into your artery. The tracer travels to your liver and then into the bile ducts. A special scanner placed over your belly tracks the movement of the tracer through your biliary tract and makes similes of the liver, gallbladder and bile ducts.

A HIDA scan is used to diagnose:

Obstruction of the bile ducts, such as due to gallstones or rarely, tumors
Diseases of the gallbladder
Bile leak