A sialogram is an x-ray of the salivary ducts and glands.

The salivary glands are located on each side of the face and send saliva into the mouth.

The test is performed in a hospital radiology department or in the health care provider's office by an x-ray technician. You may be given a sedative before the procedure.

You will be asked to lie on your back on the x-ray table. An x-ray is taken before the contrast material is injected to ensure that no stones are present to stop the contrast material from entering the ducts.

A catheter (a small flexible tube) will be inserted through your mouth and into the duct of the salivary gland. A contrast medium in then injected into the duct so that the duct will show up on the x-ray. X-rays will be taken from a number of positions.

You may be given lemon juice by mouth to help stimulate the production of saliva. Pictures are repeated to examine the drainage of the saliva into the mouth.

Inform the health care provider if you are:

• Pregnant
• Allergic to x-ray contrast material or any iodine substance
• Allergic to any drugs

You must sign a consent form. You will need to rinse your mouth with an antiseptic (germ-killing) solution before the procedure.

There is some discomfort or pressure when the contrast material is injected into the ducts. The contrast material may taste unpleasant.

A sialogram may be done when your doctor thinks you might have a disorder of the salivary ducts or glands.

Abnormal results may suggest:

• Narrowing of the salivary ducts
• Salivary gland infection or inflammation
• Salivary duct stones
• Salivary duct tumor

There is low radiation exposure. X-rays are monitored and regulated to provide the minimum amount of radiation exposure needed to produce the image. Most experts feel that the risk is low compared with the benefits. Pregnant women and children are more sensitive to the risks of x-rays.