Preparing for a breast ultrasound is straightforward: there’s no fasting, no special diet, and no major restrictions. The exam itself takes about 30 minutes, and most of what you need to do happens the morning of your appointment. Here’s what to know so you can show up ready and comfortable.
What to Wear
Wear a two-piece outfit so you only need to remove your top. You’ll change into a gown or wrap-style jacket that opens in the front, and keeping your pants or skirt on makes the whole process feel less exposed. Skip anything complicated to get in and out of, like a one-piece dress or a pullover with lots of layers. If you’re wearing a bra, you’ll remove it for the exam.
Skip Lotions, Powders, and Deodorant
On the day of your appointment, don’t apply deodorant, antiperspirant, lotion, cream, or powder to your chest, breasts, or underarms. This advice is most critical for mammograms, where aluminum particles in deodorant can mimic calcifications on the image. For ultrasound, the concern is slightly different: lotions and creams can make the skin slippery, which interferes with the technologist’s ability to maintain steady contact between the probe and your skin. That steady contact is what produces clear images.
If you forget and apply something that morning, mention it when you arrive. The facility can usually clean the area, but it’s easier to skip these products from the start.
Bring Your Previous Imaging Records
If you’ve had mammograms, ultrasounds, MRIs, or biopsies done at a different facility, bring copies of the images and reports. Radiologists compare your current scan to prior ones to spot changes over time, and imaging done elsewhere often isn’t accessible through your current provider’s system. Films, CDs, or flash drives all work. Also bring the name and contact information of the facility where prior imaging was done, in case the radiologist needs to request additional records.
If all your previous imaging was done at the same location where your ultrasound is scheduled, your records should already be on file.
No Fasting or Diet Changes Needed
Unlike abdominal ultrasounds, a breast ultrasound requires no fasting. Eat and drink normally before your appointment. You can also take your regular medications as usual, with one exception worth knowing about.
If a Biopsy Might Be Involved
Sometimes a breast ultrasound is scheduled alongside a possible biopsy, where a needle is used to sample tissue from a suspicious area. If your appointment includes this possibility, your doctor may ask you to stop taking blood thinners or anti-inflammatory medications beforehand.
The specifics depend on the type of biopsy. For simpler needle aspirations, many radiologists don’t require stopping these medications at all. For core biopsies using spring-loaded or vacuum-assisted devices, the majority of practitioners ask patients to stop aspirin and anti-inflammatory drugs 5 to 7 days before the procedure. Prescription blood thinners like warfarin are withheld even more frequently for these procedures, though guidelines from the Society of Interventional Radiology classify percutaneous breast biopsy as low-risk and consider it safe to perform on patients whose blood-clotting levels are within a normal range.
The key point: if there’s any chance your ultrasound could lead to a same-day biopsy, ask your scheduling office whether you need to adjust any medications. Don’t stop anything on your own without that conversation.
What Happens During the Exam
You’ll lie on your back on an exam table, sometimes with one arm raised above your head. The sonographer applies a clear gel to your breast. This gel eliminates tiny air pockets between your skin and the ultrasound probe, which is essential because air disrupts the sound waves the machine uses to create images. Without the gel, image quality drops significantly.
The gel can feel cold. Some facilities use warmers, but not all do. The sonographer then glides a small handheld probe across your breast, pressing gently to capture images from different angles. You may feel light pressure, but the exam is painless. The whole process typically takes about 30 minutes, though a targeted scan focused on one specific area may be shorter.
Timing Around Your Menstrual Cycle
You may have heard that scheduling breast imaging during a specific phase of your cycle produces better results. For ultrasound, this matters less than you might think. Research measuring breast density with ultrasound across different cycle phases found no statistically significant difference between the follicular phase (the first half of your cycle) and the luteal phase (the second half). Any density variation that exists is small, roughly comparable to the normal variation between two different examiners scanning the same breast.
That said, your breasts may feel more tender in the days before your period. If comfort is a priority, scheduling during the week after your period ends can make the light pressure of the probe more tolerable. This is a comfort consideration, not an accuracy one.
When to Expect Results
Turnaround time varies by facility. Some breast centers, particularly those affiliated with large medical systems, provide same-day results and can schedule follow-up tests like a biopsy on the spot if needed. In those settings, biopsy results typically come back within two to three days. Other facilities use a “screen and go” model where you leave after the exam and receive results within one business day by phone or patient portal.
When you check in, ask the staff what the timeline looks like at their facility so you know whether to expect a conversation that day or a call later in the week.
Understanding Your Report
Your results will include a BI-RADS score, a standardized rating system that ranges from 0 to 6. Knowing the scale helps you interpret what your report means before you talk to your doctor.
- BI-RADS 0: The images were incomplete, and you need additional imaging to get a clear picture.
- BI-RADS 1: Negative. Nothing abnormal was found.
- BI-RADS 2: Benign. Something was seen, like a simple cyst, but it’s clearly not cancerous.
- BI-RADS 3: Probably benign. There’s a finding that has a very low chance of being cancer, and a follow-up scan in 6 months is typically recommended.
- BI-RADS 4: Suspicious. A biopsy is usually recommended to determine what the finding is.
- BI-RADS 5: Highly suggestive of cancer. A biopsy is strongly recommended.
- BI-RADS 6: Known cancer, already confirmed by a previous biopsy.
A BI-RADS 0 result doesn’t mean something is wrong. It simply means the radiologist needs more information, often from a different imaging angle or a mammogram for comparison. Categories 1 and 2 are reassuring and require only routine follow-up.