Has your gynecologist recommended that you undergo a vaginal ultrasound? Don't worry, it hardly hurts and it doesn't take too long. It is a very useful exam on some occasions to detect different problems related to the female organs, so do not feel afraid when dealing with it. Transvaginal ultrasound is performed through the vagina, as its name suggests. By introducing a probe called a transducer, it is possible to examine the uterus, ovaries and cervix. This test is usually done with an empty or half-full bladder. To do this, the health worker will ask you to lie down on the stretcher and rest your legs on the stirrups, that is, as if it were a routine exam by the gynecologist. To make it easier to insert the catheter, you will place a condom over the device and apply a gel. The more comfortable you are, the less pain you will feel, as it will enter your body more naturally. Try to relax and not get nervous as it is a very simple exam.

Vaginal ultrasound is practically painless

  • The transducer emits sound waves that when impacted against the different organs describe images interpreted by a computer. The doctor analyzes these images through a monitor like any other ultrasound.
  • This test makes it possible to diagnose certain types of cancer of the organs analyzed as well as inflammations or congenital anomalies. It could also help find the cause of abnormal vaginal bleeding, different menstrual problems, pelvic pain, or some types of infertility. In addition, cysts and fibroid tumors can be perceived.
  • Pregnant women can also undergo a vaginal ultrasound. Thanks to it, the next arrival of the baby, different problems in the fetus, pregnancy tumors, placental abruption, miscarriage or even an ectopic pregnancy can be detected.
  • As you have been able to read, it is a simple test that does not have to cause you pain if you are relaxed. In addition, with this simple exam you can solve many present and future problems.
## Preparing for a transvaginal ultrasound: practical steps and tips As a gynecologist I see many patients who are anxious simply because they don't know how to prepare. Preparation is simple, but a few concrete steps will make the exam faster, more comfortable, and diagnostically better. - Before the appointment - Bring a current list of medications, allergies, and prior gynecologic surgeries. This is important because an intrauterine device (IUD) or recent procedures can influence the approach. - If you might be pregnant, tell the clinic so they confirm whether a urine pregnancy test is required before the exam. For early pregnancy scans (viability, bleeding), a transvaginal approach is often preferred. - Wear comfortable clothing; you will undress from the waist down and can keep your upper clothing on. - If you are menstruating, mention this when booking. Vaginal ultrasound can be performed during menses for many indications (e.g., heavy bleeding) but the report may need context. - If you have pelvic infections or active heavy bleeding, the provider may ask to reschedule or take precautions—always report new symptoms. - Bladder and bowel guidance - Unlike abdominal pelvic ultrasound, a full bladder is usually **not necessary** for a transvaginal ultrasound. Most centers ask you to come with an **empty bladder** because an overly full bladder can elevate the uterus and make insertion uncomfortable. - For combined transabdominal + transvaginal exams (rarely required), you may be asked for a half-full bladder—follow the clinic's instructions. - On the day of the exam - Arrive 10–15 minutes early to complete consent forms. - Ask for a chaperone if it makes you more comfortable — all reputable clinics will accommodate this. - If you experience anxiety or pelvic floor tightness, tell the sonographer or physician. They can pause, coach breathing and pelvic relaxation, and proceed slowly. Simple breathing and pelvic-floor relaxation techniques make a big difference. - If you prefer, ask whether the sonographer can show the image on the screen and explain findings in real time; many patients find this reassuring. Real example and practical application: - Case: Ana, 34, scheduled for scan due to irregular bleeding. She arrived with an empty bladder, relaxed after being coached to breathe slowly and to gently press her feet against the stirrups. The sonographer applied warm gel and advanced the probe slowly; Ana reported minimal discomfort. The scan identified a 2.1 cm endometrial polyp; we discussed hysteroscopy removal in clinic. Because Ana had prepared and communicated her preferences, the exam went smoothly. ## How the test is performed — step-by-step and what your doctor looks for Here's what happens in the room and the specific measurements/findings the physician is assessing: 1. Positioning - You lie on the exam table with knees bent and feet in stirrups (same position as a pelvic exam). - A sheet or gown covers you for privacy. 2. Probe preparation and insertion - The transducer is covered with a disposable sheath (condom) and lubricated with sterile gel. - The sonographer explains each step, then gently introduces the probe into the vagina — this typically reaches just below the uterine cervix. - The probe is rotated and angled to capture uterine, endometrial, ovarian, adnexal, and cul-de-sac (pouch of Douglas) views. 3. Standard images and measurements commonly obtained - Uterine orientation and size (length, anteroposterior diameter) - Endometrial thickness and pattern: - Proliferative phase: typically 5–8 mm - Secretory phase: typically 7–14 mm - Postmenopausal with bleeding: endometrium >4–5 mm often triggers further evaluation - Presence of polyps, submucosal fibroids, or intracavitary lesions - Ovarian size and morphology: - Normal premenopausal ovarian volume: ~6–14 mL (values vary) - Polycystic ovary: multiple antral follicles (2–9 mm) and increased ovarian volume >10 mL - Ovarian cyst characteristics: simple (anechoic) vs complex (septations, solid areas) - Adnexal masses, free fluid in the pelvis (could indicate hemorrhage, ruptured cyst, or ectopic pregnancy) - Early pregnancy assessment: gestational sac, yolk sac, fetal pole, crown-rump length (CRL), fetal heartbeat (detectable by TV US from ~5.5–6 weeks) 4. Duration and comfort - Most transvaginal scans take 5–15 minutes. If the exam requires additional maneuvers (Doppler, saline infusion sonohysterography), it can take longer. - Mild pressure is normal; sharp severe pain is not. If you experience severe pain, tell the sonographer immediately. Real example and practical application: - Case: Lucia, 29, with one-sided pelvic pain. Transvaginal ultrasound revealed a 5.5 cm hemorrhagic ovarian cyst with free fluid consistent with rupture. Because she was hemodynamically stable, we managed conservatively with pain control and repeat imaging in 6–8 weeks — the cyst resolved. Early identification on TVUS avoided unnecessary surgery. ## Risks, limitations and when additional tests are needed - Risks - The procedure is low risk. It uses no ionizing radiation. Infection risk is extremely low if standard sterile technique is used. Minor spotting can occur afterward. - If you have an intact hymen or prefer not to have a transvaginal exam, alternatives exist (transabdominal ultrasound, MRI) but may provide less detail. - Limitations - As with all imaging, ultrasound is operator-dependent. Image quality varies with sonographer skill, patient anatomy, and equipment. - Some deep pelvic or bowel-adherent lesions may be difficult to characterize; MRI provides better soft-tissue contrast for complex cases. - Small lesions (5–7 cm) - Persistent pelvic pain with normal ultrasound: diagnostic laparoscopy may be considered (e.g., endometriosis can be missed on ultrasound) Practical advice - Keep copies of your reports and images (CD or digital) and bring them to follow-up appointments. If your report is unclear, ask the clinician to review the images with you. - If your symptoms change (worsening pain, fever, heavy bleeding), contact your provider urgently — imaging is only part of evaluation. ## Understanding and interpreting your results: what each finding means (actionable guidance) Below are common findings and what they generally mean, plus clear next steps. - Normal pelvic ultrasound - Findings: normal-sized uterus, normal endometrium for cycle phase, ovaries with appropriate follicle pattern, no free fluid, no masses. - Action: reassure; if symptoms persist despite normal imaging, discuss other causes (pelvic floor dysfunction, GI causes) and consider further evaluation. - Thickened endometrium - Meaning: can be normal in the secretory phase, or indicate polyps, hyperplasia, or carcinoma (especially postmenopausal bleeding). - Action: correlate with age and bleeding. In premenopausal women with abnormal bleeding, trial medical management or hysteroscopy +/- biopsy. In postmenopausal women with endometrium >4–5 mm and bleeding, proceed with endometrial sampling. - Endometrial polyp - Meaning: benign overgrowth that can cause irregular bleeding or infertility. - Action: polypectomy via hysteroscopy is both diagnostic and therapeutic. For fertility concerns, removal improves pregnancy rates. - Fibroids (leiomyomas) - Meaning: benign uterine tumors; classification (submucosal, intramural, subserosal) impacts symptoms and treatment. - Action: submucosal fibroids often cause bleeding and are removed hysteroscopically. Intramural/subserosal symptomatic fibroids may be treated medically, with uterine-sparing procedures, or hysterectomy depending on desire for fertility and severity. - Ovarian cysts - Functional simple cysts (<3–5 cm) often resolve; complex cysts or large cysts may need surgical removal. - Action: small simple cysts — observe and repeat ultrasound in 6–8 weeks. Complex or suspicious cysts — refer to gynecologic surgeon; consider tumor markers (CA-125) in postmenopausal patients. - Polycystic ovarian morphology - Meaning: multiple small follicles and increased ovarian volume suggest PCOS in the right clinical context (irregular cycles, hyperandrogenism). - Action: evaluate metabolic health (glucose, lipids), treat symptoms (cycle regulation, fertility assistance), and discuss lifestyle modification. - Free pelvic fluid - Meaning: small amounts may be physiological (ovulation). Large amounts suggest hemorrhage, ruptured cyst, or ectopic pregnancy. - Action: correlate with symptoms and beta-hCG; urgent management if unstable. Real example and practical application: - Case: Rosa, 52, postmenopausal spotting. TVUS showed endometrial thickness 8 mm. We performed office endometrial biopsy — diagnosis: complex atypical hyperplasia. We discussed treatment options (hysterectomy vs progestin therapy) and proceeded to definitive surgery given risk. Early imaging and biopsy allowed timely management before progression. ## Practical considerations: payment, scheduling, and comfort measures - Insurance and cost - Coverage varies. Most diagnostic ultrasounds ordered by a clinician are covered by insurance plans. Check with your insurer and the imaging center ahead of time about preauthorization and out-of-pocket costs. - If self-paying, ask the clinic for a cash price; many offer reduced rates. - Scheduling - For fertility assessments, timing matters (e.g., follicle tracking in mid-cycle). Clarify timing with your provider; follicular tracking often requires serial scans. - For heavy bleeding, scan can be done any day. - Comfort measures during the exam - Request a same-gender sonographer if preferred. - Ask for the probe to be warmed or for breaks during the exam. - Practice slow diaphragmatic breathing; consciously relax pelvic floor muscles (imagine letting go) as you would during a bowel movement. - Post-procedure - You can resume normal activities, bathing, and intercourse immediately unless otherwise instructed. - Spotting or light bleeding may occur; if heavy bleeding, fever, or severe pain occur, contact your provider. ## When to seek a second opinion or specialist referral - Examples of when to request further evaluation: - If a reported mass has solid irregular features or increased blood flow on Doppler. - If imaging suggests possible gynecologic cancer. - Unresolved symptoms despite normal ultrasound (consider endocrinology, colorectal, or pelvic pain specialists). - Desire for fertility that may require assisted reproductive technologies; refer to reproductive endocrinology. Real example and practical application: - Case: Sofia, 41, had an adnexal mass reported as complex with papillary projections. Because her report raised concern, I referred her to a gynecologic oncologist who performed further imaging and an operative plan. Early referral helped avoid delayed diagnosis. ## FAQ ### What should I expect in terms of pain during a transvaginal ultrasound? Most patients report mild pressure or discomfort during probe insertion rather than pain. Pain that is sharp or severe is uncommon and should be reported immediately. If you have high anxiety or pelvic floor spasm, tell the provider — they can pause, give extra lubrication, and coach relaxation. For patients with vaginismus or an intact hymen, alternative imaging (transabdominal ultrasound or MRI) can be arranged. ### Is a transvaginal ultrasound safe in early pregnancy? Yes. Transvaginal ultrasound is safe and is actually preferred in early pregnancy because it provides higher-resolution images of the uterus and adnexa. It allows earlier detection of pregnancy location (intrauterine vs ectopic), fetal heartbeat, and assessment of viability from about 5–6 weeks' gestation. No ionizing radiation is used. ### My report says “complex ovarian cyst” — what does that mean and do I need surgery? A “complex” cyst has internal septations, solid components, or internal blood flow. Not all complex cysts are malignant. Management depends on your age, symptoms, size, and ultrasound features. In premenopausal women, many complex cysts are endometriomas or hemorrhagic cysts that can be observed with repeat imaging. In postmenopausal women or if suspicious features are present, further evaluation with tumor markers (e.g., CA-125) or referral to a gynecologic oncologist may be recommended. Your clinician will guide individualized care. ### Can a transvaginal ultrasound detect endometriosis? Transvaginal ultrasound can directly detect some endometriosis manifestations, particularly ovarian endometriomas (“chocolate cysts”) and deep infiltrating lesions if they are large. However, superficial peritoneal endometriosis is often missed on ultrasound. If symptoms persist (dyspareunia, cyclic bowel/bladder pain) despite a normal ultrasound, a diagnostic laparoscopy may be required for definitive diagnosis. ### How accurate is transvaginal ultrasound for diagnosing uterine fibroids vs polyps? Transvaginal ultrasound is excellent at detecting fibroids and their approximate location and size. Submucosal fibroids and intrauterine polyps can sometimes be difficult to differentiate on standard TVUS. If a polyp vs submucosal fibroid is suspected and it is clinically important (e.g., causing bleeding or infertility), a sonohysterography (saline infusion ultrasound) or diagnostic hysteroscopy provides better delineation and often allows immediate removal. For more related gynecologic guidance, see [related topic](/blog). If you need pelvic health products or educational materials used in clinic, visit our [shop](/shop). Category: Tips & Tricks Topic: Vaginal ultrasound: what is it and how is it done?