FAQ Ultrasound
- Why do I need to have a full bladder for a pelvic and/or obstetrical ultrasound?
- Why is a fat-free diet necessary prior to an abdominal ultrasound examination?
- I think I am having a problem with my intestines. When you are scanning my abdomen can
you look at them too?
- Why are you scanning over there when my pain is here?
- How accurate is the baby's due date that is estimated from an obstetrical ultrasound?
- Why can't I bring my friends, family and / or children with me to my exam?
- Why can't I have both a picture and a video tape of my obstetrical ultrasound exam?
- Why do I have to call my doctor for the results?
1. Why do I need to have a full bladder for a pelvic and/or obstetrical ultrasound?
A full bladder pushes the intestines out to the sides allowing better view of the uterus and ovaries. A full
bladder is essential for adequate visualization of the uterus and the fetus in its early stages. Urine in the
bladder also acts as a "window" illuminating the structures behind it.
2. Why is a fat-free diet necessary prior to an abdominal ultrasound examination?
A fat-free diet keeps the gallbladder and biliary system from contracting, which enables visualization of
possible gallstones and inflammation of the gallbladder wall.
3. I think I am having a problem with my intestines. When you are scanning my abdomen can you look at them
too?
The intestinal tract is always filled with air. Air refracts sound beams so soundwaves won't return to the
ultrasound unit to create a picture. The intestinal tract is better visualized with other imaging technologies
such colon x-ray (barium enema) or upper GI.
4. Why are you scanning over there when my pain is here?
Ultrasound sound waves can be projected into the body at different depths and angles, therefore we are often
imaging structures (organs), which we are not directly over. Also, multiple organs may contribute to the area
you may be concerned about. Imaging of multiple structures may be necessary to make a complete analysis.
5. How accurate is the baby's due date that is estimated from an obstetrical ultrasound?
During first trimester (1 to 12 weeks) estimated due dates from ultrasound are generally accurate within five
days. During second trimester (13-24 weeks), accuracy ranges from 1.5 weeks to 2 weeks. The accuracy can drop
to within 3 weeks during third trimester (25-40 weeks) pregnancy.
6. Why can't I bring my friends, family and / or children with me to my exam?
Sonographers perform complex technical protocols during obstetrical ultrasound examinations. It is recommended
that patients limit guests to one supportive partner.
7. Why can't I have both a picture and a video tape of my obstetrical ultrasound exam?
While interest in a memento of your obstetrical examination is understandable, our first priority is a timely
and complete medical evaluation. Patients may choose between a still picture or video tape of their unborn child.
It is important that if you request a video tape, that you do so prior to your exam and bring your own VHS tape.
8. Why do I have to call my doctor for the results?
It is important to consult with your health care provider after any examination or procedure. These results
will be compared with your overall health status, which only your physician or practitioner can assess for you.
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