If you’ve been referred for an ultrasound, one of the first questions you may have is whether it’s an internal or external exam, and what that means. While both types use the same core ultrasound technology to create detailed images of the body, the procedures themselves are quite different. Understanding what happens during each type can help reduce anxiety and ensure you’re fully prepared.
At TrueView Ultrasound in Roseville, we perform both internal and external scans in a professional, discreet, and family-friendly setting. Here’s a breakdown of what each type involves and what you can expect during your visit.
What Is an External Ultrasound?
External ultrasounds are the most common type and are completely non-invasive. They use a handheld device called a transducer that moves along the surface of your skin. This device sends sound waves into the body and captures the returning echoes to create images in real time.
You’ll usually lie on a padded exam table while a clear, water-based gel is applied to the skin to help the transducer glide and ensure accurate results. External ultrasounds are commonly used for:
- Pregnancy scans (fetal development, gender, heartbeat)
- Abdominal imaging (liver, kidneys, gallbladder, aorta)
- Pelvic and soft tissue exams
- Vascular screenings (carotid arteries, DVT)
For example, expectant parents who visit our fetal imaging service often receive external ultrasounds for 3D/4D baby scans or early gender reveals.
What Is an Internal Ultrasound?
Internal ultrasounds—also called transvaginal or endovaginal ultrasounds—use a specially shaped probe inserted a few inches into the vaginal canal. This method allows for much closer imaging of reproductive organs, offering clearer visuals for early pregnancy or gynecological concerns.
Despite how it may sound, this procedure is typically painless and takes only a few minutes. The probe is covered in a sterile sheath and lubricated for comfort. You’ll lie back on the table, and a professional sonographer will gently insert the probe while explaining each step.
Internal ultrasounds are used to assess:
- Early-stage pregnancy (especially before 10 weeks)
- Ovarian cysts, fibroids, or uterine abnormalities
- Pelvic pain or unexplained bleeding
- Fertility tracking and egg follicle monitoring
If your provider recommends this scan, our ultrasound screenings page outlines the types of diagnostic services available, many of which do not require a physician referral.
How to Prepare for Each Type of Ultrasound
Preparation depends on the area being scanned. For external abdominal ultrasounds, you may be asked to fast for several hours. Pelvic ultrasounds often require a full bladder, while internal scans usually require you to empty your bladder before the appointment for optimal visibility.
We’ve outlined complete guidelines on our ultrasound preparation page so you know exactly what to do before arriving. Following these steps can help reduce scan time and improve image accuracy.
Which One Will You Need?
Your provider or sonographer will decide which method is best based on your condition and what they’re looking for. In many cases, a combination of both may be used. For instance, a pregnancy ultrasound might begin externally and then switch to internal for clearer views of the uterus or ovaries.
Understanding the difference between internal vs external ultrasound procedures gives you more confidence walking into your appointment. Both methods are safe, widely used, and provide essential information for early diagnosis, screening, or fetal health tracking.
Conclusion
Whether you’re scheduled for a routine external scan or a more detailed internal exam, the process is designed with your comfort and care in mind. Each type of ultrasound has a specific role in helping professionals visualize your internal organs or pregnancy progress with remarkable detail and accuracy.
If you have concerns about an upcoming scan, TrueView Ultrasound in Roseville offers compassionate, personalized care to guide you through it. Our certified team takes time to answer your questions and make your experience as comfortable as possible. To schedule an appointment or speak with our staff, reach out to our Roseville clinic today.
