Preparing for a transvaginal ultrasound is straightforward: empty your bladder beforehand, wear comfortable clothing, and remove any tampon or menstrual cup before the exam. Unlike an abdominal ultrasound, which requires a full bladder to create a clear window to the pelvic organs, a transvaginal scan works best when your bladder is empty. That’s the single most important preparation step, and it’s also what makes the experience more comfortable.
Why an Empty Bladder Matters
If you’ve had an abdominal pelvic ultrasound before, you probably remember the uncomfortable full-bladder requirement. A transvaginal ultrasound flips that rule. The American College of Radiology’s current practice guidelines state that the bladder should “preferably be empty” for a transvaginal scan. Because the ultrasound probe sits much closer to the uterus and ovaries than an external probe would, it doesn’t need a full bladder as an acoustic window. An empty bladder also keeps the organs in their natural position, giving the sonographer a clearer image.
In a study of over 200 patients, a transvaginal scan alone was sufficient to capture all findings in about 84% of cases without a full bladder at any point. Only 1.5% of patients needed a full bladder at all, and those were cases where a normal ovary was difficult to visualize. So unless your provider specifically tells you otherwise, use the restroom right before your appointment.
One exception: if your appointment includes both an abdominal and transvaginal ultrasound (sometimes done together), you may be asked to arrive with a full bladder for the abdominal portion first, then empty it before the transvaginal scan. Your scheduling instructions will clarify this.
What to Wear
You’ll undress from the waist down for the exam and be given a sheet to drape over yourself. Loose, comfortable clothing makes this quicker and easier. If you wear a skirt or dress, you may only need to remove your underwear rather than fully changing. There’s no need for a hospital gown in most cases. Avoid rompers, jumpsuits, or anything that requires you to undress completely for a simple waist-down change.
If You’re on Your Period
Having your period does not cancel the appointment. Transvaginal ultrasounds can be performed during menstruation without any effect on image quality. The one thing you need to do is remove your tampon or menstrual cup before the procedure. If you’re using a pad, there’s nothing extra to worry about. Bring a fresh pad or tampon to use afterward if you’d like.
Mention a Latex Allergy
The ultrasound probe is covered with a thin sheath, similar to a condom, for hygiene. Some of these covers contain latex. There are documented cases of anaphylactic reactions during transvaginal ultrasounds caused by mucosal exposure to latex from the probe cover. If you have a known or suspected latex allergy, tell the scheduling staff when you book and remind the sonographer before the exam begins. Non-latex covers are widely available, and most facilities stock them, but only if they know to use one.
What Happens During the Exam
You’ll lie on your back on an exam table with your knees bent and feet in stirrups or resting flat with your knees apart, similar to a pelvic exam. The sonographer applies lubricating gel to a slim, wand-shaped probe (roughly the width of two fingers) and gently inserts it into the vagina. The probe emits sound waves that bounce off your pelvic organs to create images on a screen.
Most people feel pressure rather than pain. The sonographer will angle and rotate the probe to capture views of the uterus, ovaries, cervix, and surrounding tissue. You may feel mild discomfort when they press the probe toward a particular side to get a clearer look at an ovary, but it shouldn’t be sharp or intense. If it is, say something. The sonographer can adjust their technique.
The entire exam typically takes 15 to 30 minutes. There’s no radiation involved, and no recovery time. You can drive yourself home and resume all normal activities immediately.
After the Scan
You may notice a small amount of gel residue or very light spotting afterward. Both are normal and typically resolve within a few hours. There are no activity restrictions, no medications to take, and no follow-up steps on your end unless your provider contacts you.
A radiologist reviews the ultrasound images and sends a report to the doctor who ordered the test. Most scans are read within one to two days. Depending on the findings, your doctor may discuss results at a follow-up visit, call you, or send them through a patient portal. If additional testing like a biopsy or repeat imaging is needed, your doctor’s office will reach out to schedule it.
Quick Checklist Before Your Appointment
- Empty your bladder right before the exam (unless told to arrive with a full bladder for a combined scan).
- Wear loose clothing or a skirt for easy changing.
- Remove any tampon or menstrual cup before the procedure.
- Mention any latex allergy when scheduling and again on the day of the exam.
- Bring a pad if you’re menstruating or prefer one for any residual gel.