Ultrasounds use sound waves to obtain images. Real-time imaging is the main sonographic technique that is used for both obstetrical and gynecological ultrasounds.
Obstetrical ultrasounds can be performed during all stages of the pregnancy. Ultrasounds are performed mainly using either a trans-abdominal or trans-vaginal approach.
Most patients typically have at least one ultrasound in the 1st trimester to confirm presence of a viable pregnancy within the uterus and also to help to estimate the gestational age of the fetus. An ultrasound in the 1st trimester of the pregnancy is considered to be the most accurate in estimating the gestational age of the fetus.1st trimester ultrasounds can be done both with a trans-vaginal or trans-abdominal approach depending on what is being evaluated.
Ultrasounds in 2nd and 3rd trimester on the other hand are more commonly done with the trans-abdominal approach, but a trans-vaginal approach may also be used as needed.
Most patients generally receive at least one ultrasound in the 2nd trimester for evaluation of fetal anatomy. According to the American College of Obstetrics and Gynecology, the optimal time for this ultrasound is at 18-22 weeks of gestation. Ultrasonography is considered safe for the fetus when it is used appropriately to help gain medical information important for the pregnancy.
An additional type of gynecologic ultrasound that can also be performed at our office is the saline infusion sonohysterography (SIS). This ultrasound involves fluid being infused into the uterine cavity through the cervix to help provide improved visualization of the endometrial cavity/lining during a trans-vaginal ultrasound.
Most patients at Gwinnett OB/GYN have their first pregnancy ultrasound at their initial prenatal visit, which typically occurs around 7 weeks. This first-trimester ultrasound confirms the pregnancy, establishes gestational age and provides the most accurate dating of your due date.
Most patients receive at least one first-trimester ultrasound for dating and one anatomy scan between 18 and 22 weeks. Additional ultrasounds may be scheduled based on your clinical situation, such as tracking fetal growth, confirming placenta position or monitoring a high-risk condition. Your provider will let you know how many scans are planned for your pregnancy.
A saline infusion sonohysterogram is an in-office procedure in which a small amount of saline is introduced into the uterine cavity while an ultrasound is performed. It provides detailed images of the uterine lining and is used to evaluate abnormal bleeding, polyps or structural abnormalities. Patients are asked to abstain from intercourse for 14 days before the procedure. Postmenopausal patients may be prescribed Cytotec to help prepare the cervix.
Your sonographer will share preliminary images with you during the appointment. A formal interpretation by your provider is typically completed and communicated within a short time after the scan. Your provider or a staff member will follow up with you if any findings require additional discussion or action.
Medically ordered ultrasounds are generally covered by insurance as part of prenatal care or when performed to evaluate a gynecologic condition. Coverage depends on your specific plan, the number of scans ordered and whether the scan is classified as diagnostic or screening. Contact your insurance provider to confirm your benefits. Keepsake 3D and 4D ultrasound packages are not covered by insurance and are billed separately.
If you are scheduled to deliver in 2027, changes to CMS billing guidelines will affect how your maternity care is billed.
We are happy to answer any questions you may have. Please speak with your care team at your next visit or contact our billing office directly