Sonography is the use of �sound waves� to record images of the bladder, uterus, and ovaries. This examination of the pelvic and fetal anatomy lasts approximately 30-60 minutes.

On the day of the examination for patients up to 21 weeks pregnant:

• For patients less than 12 weeks pregnant, start drinking 32 ounce glasses of water 1 �-2 hours before your appointment time. Finish drinking the 32 ounces of water one hour before your appointment to allow your bladder time to fill.
• Patients 12 - 21 weeks pregnant should finish drinking only 16 ounces of water one hour before your appointment.
• Do not empty your bladder after drinking the water until the examination is completed, or you may need to reschedule.
• Your bladder must be full in order to do the examination. You will be able to empty your bladder when the examination is completed.

On the day of the examination for patients 22 or more weeks pregnant:

• No preparation is required for patients 22 or more weeks pregnant.
• You do not need to have a full bladder at this stage of pregnancy.