By Jiahe Zhang

Transvaginal ultrasound (TVUS) is an imaging modality commonly used for evaluating female pelvic anatomy, early pregnancy, and gynecologic pathology. This webinar provides a comprehensive walk-through of when and how to perform TVUS, including probe orientation, patient positioning, image interpretation, infection control, and proper terminology.

For point-of-care clinicians, understanding TVUS is essential for timely diagnosis, particularly in early pregnancy assessment, ectopic pregnancy detection, and pelvic pain evaluation. This modality offers superior resolution compared to transabdominal ultrasound and can significantly influence clinical decision-making and patient outcomes.

Key Takeaways From the On-demand Webinar: Introduction to Transvaginal Ultrasound (TVUS)

1. TVUS is complementary to transabdominal pelvic ultrasound.
Transabdominal scanning provides wider coverage and a broader picture, while TVUS provides the detail needed to confirm subtle findings, especially in early pregnancy and adnexal pathology.

2. Higher frequency equals higher resolution because the target is closer.
TVUS typically uses a higher frequency transducer (approximately 5 to 12 MHz), improving axial resolution and patient-level detail for the endometrium, myometrium, adnexa, and early gestational structures.

3. Probe orientation and image interpretation must be deliberate.
In sagittal views, the probe marker is oriented toward the ceiling; then the probe is rotated 90 degrees to obtain the coronal view with the marker toward the patient’s right side, ensuring correct image orientation and consistent reporting.

4. Bladder status matters.
TVUS generally requires an empty or near empty bladder, unlike transabdominal pelvic ultrasound, where a fuller bladder may be used as an acoustic window.

5. High-level disinfection is mandatory after every TVUS exam.
Even when a probe cover is used, TVUS requires high-level disinfection after every examination. Follow manufacturers’ guidelines to properly disinfect the TVS transducer to prevent patient-to-patient transmission of infection.

Clinical Application

In actual practice, a common workflow is to start with a quick transabdominal scan for global assessment, then move to TVUS for definitive pelvic detail. This approach improves sensitivity for diagnosing ectopic pregnancy, differentiating corpus luteum from true ectopic findings, confirming IUD position, and assessing early pregnancy development (yolk sac, embryo, cardiac activity).

When a patient presents in an unstable condition clinically with suspected occult hemorrhage, rapid ultrasound assessment of the cul-de-sac and pelvis can accelerate escalation to resuscitation and definitive management.

Conclusion

Transvaginal ultrasound is a powerful and effective component of point-of-care obstetric and gynecologic assessment. Its superior image resolution and diagnostic value make it indispensable for evaluating early pregnancy, pelvic pain, and pregnancy related emergencies. By mastering proper techniques, disinfection protocols, and standardized terminology, clinicians can dramatically improve diagnostic accuracy and patient care.

Watch the full webinar: Introduction to Transvaginal Ultrasound (TVUS)

In addition, we invite learners to continue exploring additional webinars and self-paced POCUS modules to strengthen their skills and stay aligned with evolving best practices in ultrasound education.

Jiahe Zhang is an intern with the POCUS Certification Academy.