It depends on how far along you are and the practice. Not all doctors themselves do the ultrasounds, many times in larger practices they have a seperate room and an ultrasound tech does the ultrasound. If you are in your first trimester it'll basically be to look and maybe HEAR the heartbeat and measure the baby from crown to rump to give you an EDD and make sure the baby is measuring close to your EDD.
When you have the larger diagnostic ultrasound at 16-22 weeks, it's much more indepth. They take a lot of measurements (arms, legs, head circumfrence) to look to make sure everything is growing as it should, they also look at the fluid at the back of the neck because if it's too thick it can be an indication of downs syndrome. This ultrasound can also usualy tell you the sex of the baby if you wish to know. Amniotic fluid also gets measured as well as the heart beat and the heart chambers!
at 4:33 PM on Jul. 7, 2009