May 3, 2023/Primary Care

Two Sides of the Same Imaging Test: Ultrasound vs. Sonogram

One medical test, two different parts

doctor conducting an ultrasound on a knee joint

If you’re pregnant or need a medical diagnosis, your provider might order an ultrasound. Or is it a sonogram? Many people use these terms interchangeably, but they’re not necessarily the same thing. And technically, you can think of them as two sides of the same coin.

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Radiologist Albert Parlade, MD, clears up the confusion around sonograms versus ultrasounds, and how and why they’re used for various circumstances.

Ultrasound vs. sonogram: Which is better?

Medical terms can be confusing. You’ve probably heard people say they’re “getting a sonogram” or “need an ultrasound done.” But what do these terms actually mean, and is one better than the other?

“Sonogram and ultrasound are two different parts of the same medical test,” says Dr. Parlade. “The word ‘ultrasound’ refers to sound waves used during an ultrasound exam, which is a medical imaging test. These waves are higher than what humans can hear, but they can create images of body tissues.”

A sonogram, then, is the picture created by the ultrasound machine.

“Think of the ultrasound machine as your camera, and the sonogram as the photograph you get from the camera,” clarifies Dr. Parlade.

And in the case of a prenatal ultrasound, you might receive a printout picture of the sonogram after your exam.

What can an ultrasound detect?

An ultrasound exam collects images of soft tissues inside your body. Most people associate ultrasound with pregnancy, but it’s also used for many other medical reasons.

“Ultrasound exams help providers diagnose or rule out many conditions,” says Dr. Parlade. “They’re noninvasive, painless and don’t use radiation.”

An ultrasound exam can spot growths or abnormalities inside of your body. It can also clearly show and measure fluids.

“Ultrasound waves go straight through water, so water appears black on a sonogram,” explains Dr. Parlade. “If the fluid is infected or contains blood, it shows up in shades of gray. An ultrasound also highlights textures and details on your tissues and organs.”

What ultrasounds can show

Providers use ultrasound exams to view:

  • Abdominal organs, including your gallbladder, liver, pancreas and spleen.
  • Pelvic organs like your ovaries, prostate and uterus.
  • Your urinary system, including your bladder and kidneys.
  • Fluids, like amniotic fluid during a pregnancy or urine in your bladder.
  • Blood flow in your arms, neck or legs.
  • Breast lumps and cysts.
  • Muscles and tendons.

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When an ultrasound isn’t ideal

But an ultrasound can’t see everything. It’s usually not the best test to view bones.

“Bones block sound waves, so they don’t show up well on an ultrasound exam,” explains Dr. Parlade. “We usually perform an X-ray if we need to get a picture of a bone. Ultrasound also cannot see structures inside your joint, such as cartilage.”

In addition, an ultrasound isn’t always the first exam choice for organs that contain air, such as your small or large intestine (although an endoscopic ultrasound can be used to examine the inside of your digestive system).

“Air appears bright white on a sonogram and obscures the image,” he adds. “We typically use other tests, like a CT scan or MRI, if we need an image of the bowel.”

Ultrasound during medical procedures

An ultrasound isn’t just a standalone medical test. Providers also use this technology to guide minimally invasive procedures, like a breast biopsy.

An ultrasound machine can generate real-time sonograms during a biopsy or cyst drainage. The sonogram allows your provider to see the exact location of the needle or tool without a large incision. Providers also use ultrasound guidance during IVF (in vitro fertilization) to guide an embryo into the uterus.

How does an ultrasound work?

If you need an ultrasound exam, you see a sonographer. This medical professional specializes in using an ultrasound machine to collect clear images.

The sonographer places an ultrasound probe on your skin or inside a natural opening of your body, like your vagina or anus. During the test:

  • The probe projects ultrasound waves through your skin or into your body. You can’t hear or feel these waves.
  • The ultrasound waves bounce off body tissues and go back to the probe.
  • The probe creates a “map” of your body tissues and fluids based on how the ultrasound waves come back.

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What is a sonogram used for?

“Your sonogram is a real-time, moving image that appears on a computer screen during your ultrasound exam,” says Dr. Parlade. “During your test, the sonographer periodically freezes live images to create snapshots of important information. They may also save video loops to show movements of a fetus or fluid.”

It’s common to get a printout of your sonogram after a pregnancy ultrasound exam. This is the black-and-white image that parents often save. Your obstetrician views your sonogram to check the health and well-being of the developing fetus.

If you need a sonogram for another medical reason, you may not receive a printout afterward unless you ask for one. But a radiologist will view and interpret your sonogram images and video loops. Usually, the radiologist sends a report to your referring provider with a diagnosis or other information based on your results.

Two terms, one test

Whether you call it an ultrasound or a sonogram, you’re getting the same imaging test done. Fortunately, you don’t have to worry about whether one is better than the other.

If you have questions about an ultrasound or any medical procedure, talk to your healthcare provider. They can tell you why you need the test and what they’re looking for. When you’re empowered with that information, you can make better, informed decisions for your own medical care.

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