Private Pelvic Ultrasound-Scan in London

What Is a Pelvic Ultrasound-Scan?

A pelvic ultrasound-scan is a diagnostic imaging procedure that uses high-frequency sound waves — typically between 3.5 and 10 MHz — to generate real-time cross-sectional images of the pelvic organs. Unlike X-ray or CT, it produces no ionising radiation, making it safe for repeated use and appropriate for women of all ages, including those who may be pregnant.

The scan visualises the uterus (including the endometrial cavity and myometrium), both ovaries, the fallopian tubes when visible, the pouch of Douglas, and the surrounding pelvic soft tissues. It is distinct from a renal ultrasound-scan, which focuses on the kidneys and bladder, and from a transabdominal obstetric scan, which is optimised for foetal assessment in established pregnancy.

Two approaches are used in clinical practice. A transabdominal scan (TAS) places the probe on the lower abdomen and requires a full bladder to create an acoustic window. A transvaginal scan (TVS) introduces a slim, covered probe into the vaginal canal, placing the transducer closer to the pelvic organs. TVS consistently produces superior image resolution — particularly for the endometrium, ovaries, and early intrauterine pathology — and is the preferred approach for most gynaecological indications according to BMUS and NICE guidance.

What Can a Pelvic Ultrasound-Scan Detect?

A pelvic ultrasound-scan is the primary imaging tool for a wide range of gynaecological conditions. The table below summarises the main indications and what the scan can characterise for each.

Transvaginal vs Transabdominal: Which Approach Is Right for You?

The choice between transvaginal and transabdominal scanning depends on the clinical question, patient anatomy, and patient preference. Both approaches are available at Victoria Medical, and your sonographer will discuss the options with you before the scan begins.

For most gynaecological indications — including fibroid mapping, ovarian cyst assessment, endometrial measurement, and fertility evaluation — the transvaginal approach provides significantly better image quality. A 2022 narrative review in Diagnostics (Daniilidis et al.) confirmed that TVS is non-inferior to MRI for the diagnosis and staging of deep infiltrating endometriosis when performed by a trained sonographer using the IDEA consensus protocol. A 2025 prospective accuracy study (Mick et al., O&G Open) reported TVS sensitivity of 95% for ovarian endometriomas and 84–100% for deep endometriosis sites using the same protocol.

A transabdominal scan is preferred when a transvaginal approach is declined, when assessing large pelvic masses that extend beyond the transvaginal field of view, or when evaluating the bladder and lower ureters. In many cases, both approaches are performed sequentially to give the most complete picture.

Conditions We Assess and How the Scan Informs Management

Understanding what the scan will look for — and why — helps you arrive prepared and leave with clarity.

• Uterine fibroids (leiomyomata): Fibroids affect up to 70% of women by age 50 (Mension et al., 2024, Fertility & Sterility). TVS is recommended as the initial diagnostic modality because of its accessibility and high sensitivity. The scan maps fibroid number, dimensions, and FIGO classification (submucosal, intramural, subserosal), which directly determines whether medical, procedural, or surgical management is most appropriate.
• Ovarian cysts: The IOTA (International Ovarian Tumour Analysis) simple rules classify cysts as benign, malignant, or inconclusive based on five ultrasound features. A simple unilocular cyst <5 cm in a premenopausal woman carries a very low malignancy risk and typically requires only surveillance. Complex cysts with solid components, thick septations, or internal vascularity require further assessment.
• Endometriosis: TVS with the IDEA consensus protocol achieves sensitivity of 84–100% for deep infiltrating endometriosis at key anatomical sites (Mick et al., 2025). Ovarian endometriomas are characterised by their ground-glass echogenicity and are detected with pooled sensitivity of 89% and specificity of 95% on TVS (Kanti et al., 2024, JOGC). Superficial peritoneal endometriosis remains challenging to detect by any imaging modality.
• Polycystic ovarian syndrome (PCOS): The Rotterdam criteria require at least two of three features: oligo/anovulation, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology on ultrasound. TVS antral follicle count (AFC ≥20 per ovary) and ovarian volume (>10 mL) are the sonographic criteria. Our blood tests service can assess LH, FSH, testosterone, and AMH to complete the diagnostic picture.
• Postmenopausal bleeding: NICE NG12 recommends urgent transvaginal ultrasound to measure endometrial thickness. A threshold of <4 mm has a negative predictive value of approximately 96% for endometrial cancer in postmenopausal women. Endometrial thickness ≥4 mm or an abnormal endometrial appearance requires hysteroscopy and biopsy.
• Fertility assessment: Antral follicle count is the strongest sonographic predictor of ovarian reserve and response to ovarian stimulation (NICE CG156). The scan also identifies structural factors — fibroids, polyps, uterine anomalies — that may affect implantation.

How to Prepare for Your Pelvic Ultrasound-Scan

Preparation depends on which approach your sonographer will use. At the time of booking, our team will advise you based on your clinical indication.

For a transabdominal scan: drink approximately one litre of water in the hour before your appointment and do not empty your bladder. A comfortably full — not painfully distended — bladder is the target.

For a transvaginal scan: an empty bladder is preferred, as a full bladder pushes the uterus and ovaries away from the probe. You may empty your bladder before the scan begins.

No fasting is required for a pelvic ultrasound-scan. Wear comfortable, two-piece clothing for easy access. A female sonographer is available on request — please let us know when booking.

What to Expect During and After Your Scan

The appointment typically takes 20–30 minutes. Your sonographer will explain each step before proceeding and will pause at any point if you are uncomfortable.

For the transabdominal component, warm gel is applied to your lower abdomen and a handheld probe is moved across the skin. The procedure is painless. For the transvaginal component, a slim probe covered with a sterile sheath and gel is gently inserted into the vagina. Most patients describe mild pressure rather than pain; the procedure is stopped immediately if you ask.

Your sonographer will share preliminary observations with you at the end of the scan. A detailed written report — prepared by a specialist and reviewed by Dr Xynopoulos — is available within 24 hours. If your findings require immediate clinical attention, we will contact you the same day and can arrange an urgent gynaecology consultation.

Private Pelvic Ultrasound-Scan vs NHS Pathway

Understanding the difference between the NHS and private pathways helps you decide which route is right for your situation.

The Clinical Evidence Behind Pelvic Ultrasound

Transvaginal ultrasound is supported by a robust evidence base as the first-line imaging tool for most gynaecological conditions. The following peer-reviewed studies underpin our clinical approach.

Daniilidis et al. (2022, Diagnostics) conducted a narrative review confirming that TVS, in the hands of appropriately trained clinicians, is non-inferior to MRI for the diagnosis and assessment of deep infiltrating endometriosis. The IDEA consensus — International Deep Endometriosis Analysis — standardised the terminology and structured approach used by our sonographers.

Guerriero et al. (2018, Ultrasound in Obstetrics & Gynaecology) performed a systematic review and meta-analysis of six studies (n = 424) comparing TVS and MRI for deep infiltrating endometriosis. Pooled sensitivity for rectosigmoid DIE was 0.85 for both modalities; specificity was 0.96 for TVS and 0.95 for MRI — confirming equivalent diagnostic performance.

Mick et al. (2025, O&G Open) conducted a prospective diagnostic accuracy study of 125 patients using the IDEA protocol. TVS achieved sensitivity of 95% for ovarian endometriomas, 84–100% for deep endometriosis sites, and specificity of 97–100% — reinforcing TVS as the first-line tool in endometriosis management.

Kanti et al. (2024, Journal of Obstetrics and Gynaecology) performed a systematic review of 16 studies (n = 1,976) and reported pooled TVS sensitivity of 89% and specificity of 95% for endometriomas — comparable to MRI (sensitivity 94%, specificity 94%).

Mension et al. (2024, Fertility & Sterility) reviewed current diagnostic tools for uterine fibroids and confirmed that TVS is recommended as the initial diagnostic modality because of its accessibility and high sensitivity, with MRI reserved for cases requiring precise surgical mapping.

What to Expect at Your Appointment

Frequently Asked Questions