What it is (overview)

A pelvic ultrasound scan (often searched as a pelvic scan or pelvis scan) is a safe, noninvasive imaging test that uses sound waves (not radiation) to create pictures of the organs and structures inside the lower abdomen and pelvis. It helps clinicians evaluate reproductive organs and nearby pelvic structures.

Depending on your symptoms and anatomy, the exam may be done as:

• Transabdominal pelvic ultrasound: the ultrasound probe is moved over the lower belly, usually with a full bladder to improve the view.
• Transvaginal ultrasound (for many people with a vagina): a slender probe is placed into the vagina to provide more detailed images of the uterus, ovaries, and surrounding tissues.

A pelvic ultrasound can assess the uterus (including the lining/endometrium), ovaries, fallopian tube area, cervix, and may also evaluate the bladder and detect free fluid in the pelvis. In early pregnancy (often misspelled as “pregancy” in searches), it can confirm location of the pregnancy, estimate gestational age, and check for certain complications.

What the results mean (plain language): Results describe what the sonographer and radiologist see on the images—such as organ size and shape, presence of cysts or masses, thickness of the uterine lining, signs of inflammation, or fluid. A “normal” scan means the visible pelvic organs look typical for your age and situation. “Abnormal” findings may suggest issues like uterine fibroids, ovarian cysts, infection/inflammation, or early pregnancy concerns. Ultrasound findings are interpreted along with your symptoms, exam, and other tests (for example, urine tests for cystitis or blood tests in pregnancy).

When & why it's usually done

Clinicians commonly order a pelvic ultrasound scan to investigate pelvic or lower abdominal symptoms and to guide diagnosis and treatment planning. It may be recommended if you have:

• Pelvic pain (sudden or ongoing), cramping, or pressure
• Abnormal vaginal bleeding (heavy periods, bleeding between periods, bleeding after menopause)
• Menstrual irregularities or concerns about the uterine lining (endometrium)
• Symptoms of infection such as fever, pelvic tenderness, unusual discharge, or pain with intercourse—when pelvic inflammatory disease (PID) is suspected
• Urinary symptoms such as pain/burning with urination, frequent urination, or pelvic pressure—sometimes to evaluate the bladder or look for other causes when cystitis (bladder infection) is in the differential
• A palpable mass or fullness on physical exam
• Fertility concerns (evaluation of the uterus and ovaries, follicle monitoring in some settings)
• Pregnancy-related concerns, such as confirming an intrauterine pregnancy, dating the pregnancy, bleeding in early pregnancy, or assessing pain that could suggest complications (your clinician will choose the most appropriate type of pelvic scan)
• Follow-up of known findings, such as monitoring growth of uterine fibroids or checking whether an ovarian cyst has resolved

Because it is widely available and does not use ionizing radiation, pelvic ultrasound is often a first-line test for evaluating many gynecologic and pelvic complaints.

Common diseases related to it

• Uterine fibroids (leiomyomas)
• Ovarian cysts (functional cysts, hemorrhagic cysts)
• Polycystic ovary syndrome (PCOS) (as part of evaluation, alongside symptoms and labs)
• Pelvic inflammatory disease (PID) and tubo-ovarian abscess (in more advanced cases)
• Endometriosis (ultrasound may detect endometriomas; some disease may not be visible)
• Adenomyosis (suggestive features may be seen)
• Endometrial thickening, polyps, or hyperplasia
• Ectopic pregnancy or early pregnancy complications (depending on timing and findings)
• Miscarriage (pregnancy loss) evaluation
• Uterine or ovarian masses, including concern for cancer (requires further evaluation if suspected)
• Bladder abnormalities or urinary retention (sometimes assessed alongside symptoms attributed to cystitis)

Health goals where it may help

• Clarifying the cause of pelvic pain, pressure, or bloating
• Evaluating abnormal uterine bleeding and supporting menstrual health
• Monitoring known uterine fibroids or ovarian cysts over time
• Supporting fertility planning and reproductive health assessment
• Early pregnancy confirmation, dating, and reassurance when symptoms occur
• Assessing suspected pelvic infection/inflammation (including possible pelvic inflammatory disease) to guide timely treatment
• Checking pelvic organ and bladder-related causes of urinary symptoms when symptoms overlap with cystitis
• Guiding next steps (additional imaging, lab tests, or referral) when a pelvic scan finds an abnormality