Obstetrical Ultrasound

Description - Obstetrical ultrasound uses sound frequency in a range higher than humans are able to hear to produce images of internal structures on a viewing screen. An obstetrical/endovaginal ultrasound enables the radiologist to visualize the baby inside the mother’s uterus. In some cases during early pregnancy the radiologist may recommend an endovaginal study which involves the use of a special small transducer placed in a protective cover and then inserted into the vagina to improve visualization of the baby or the cervix.

Indications: The most common reason for having an obstetrical ultrasound is to help the healthcare provider to determine a due date. It is also used to ensure that a baby is growing properly, record fetal position, to locate the placenta, to determine the amount of amniotic fluid around the baby and to detect the presence of a multiple pregnancy. In some cases ultrasound may be used to detect birth defects.


Procedure - For an obstetrical scanning procedure, a gel-like material is put on the abdomen and a transducer is placed on the skin. The transducer passes sound waves through the skin which reflect off internal structures. These echoes are transformed electronically to form an image on a monitor. The baby’s heartbeat and movements can be seen depending on the age of the baby. These images are recorded on film or paper. The length of the exam varies according to the number and age of the baby or babies.


Prep - The patient must know the date of their last menstrual period. They must drink 32-48 oz. of water 2 hours (no soda pop) before the appointment. THE PATIENT MUST NOT VOID BEFORE THE EXAM.



Single Gestation   Under Three Months   30 minutes


Single Gestation   Over Three Months     45 minutes


Twin Gestation      Under Three Months   45 minutes


Twin Gestation      Over Three Months     90 minutes

* This test information is intended for educational purposes only. This should not replace medical advice from your healthcare provider. Please call your healthcare provider if you have any medical questions concerning your health. For any questions regarding procedures, please contact Advanced Diagnostic P.C. office at 989-799-5699