✍️ Written by the MedTestBD Editorial Team · Last reviewed: June 2026
What is a Transvaginal Ultrasound (TVS)?
A transvaginal ultrasound (TVS) is an internal pelvic ultrasound where a thin, smooth probe is gently inserted into the vagina to produce detailed images of the uterus, ovaries, fallopian tubes, and surrounding structures. Because the probe is positioned closer to the pelvic organs than an external abdominal scan, TVS produces significantly clearer and more detailed images — particularly in early pregnancy and for evaluating small ovarian or uterine abnormalities. It does not require a full bladder.
Why is a TVS Done?
- To confirm and monitor very early pregnancy — TVS detects a fetal heartbeat as early as 5–6 weeks, earlier than an abdominal scan
- To investigate ectopic pregnancy — a pregnancy outside the uterus that cannot always be seen on abdominal scan
- To evaluate unexplained pelvic pain, irregular bleeding, or abnormal vaginal discharge
- To detect and measure ovarian cysts, uterine fibroids, or endometrial polyps with greater precision
- To assess the endometrium (uterine lining) thickness — important in infertility workup and post-menopausal bleeding
- To monitor follicle growth during IVF or fertility treatment cycles
- To investigate polycystic ovary syndrome (PCOS) — TVS clearly shows the characteristic follicle pattern
TVS vs Abdominal Pelvic Ultrasound
| Feature | Transvaginal (TVS) | Abdominal Pelvic Scan |
|---|---|---|
| Image clarity | Superior — probe is closer to organs | Good — adequate for most routine scans |
| Bladder preparation | Empty bladder preferred | Full bladder required |
| Early pregnancy detection | From 5–6 weeks | From 7–8 weeks |
| Best for | Early pregnancy, endometrium, small ovarian cysts, IVF monitoring | Late pregnancy, large masses, general pelvic screening |
How to Prepare for a Transvaginal Ultrasound
- An empty or minimally filled bladder is preferred — unlike the abdominal scan, a full bladder is not needed and can actually reduce image quality
- No fasting is required
- The procedure is performed by a trained sonologist or gynaecologist — the probe is covered with a sterile sheath and ultrasound gel before insertion
- The scan is generally well tolerated; mild discomfort is possible but it should not be painful — inform the doctor immediately if you experience significant pain
- Bring any previous scan reports, pregnancy test results, or referral documents
⚠️ This information is for general reference only. Always consult a qualified physician before undergoing any medical test.