Is A Lumbar Spine CT Scan?
A CT scan, commonly referred to as a CAT scan, is a type of X-ray
that produces cross-sectional images of a specific part of the body. In the
case of a lumbar spine CT scan, your doctor can see a cross-section of your
lower back. The scanning machine circles the body and sends images to a
computer monitor, where they are reviewed by a technician.
The lumbar portion of the spine is a common area where back
problems occur. The lumbar spine is the lowest portion of your spine. It’s made
up of five vertebral bones. Below the lumbar spine is the sacrum and below the
sacrum is the coccyx (tailbone). Large blood vessels, nerves, tendons,
ligaments, and cartilage are also part of the lumbar spine.
Is A Lumbar Spine CT Scan Performed?
A CT scan is one of many imaging tests your doctor may use to
investigate problems with your spine. This includes pain due to injuries,
disease, or infection.
Other reasons your doctor might order a lumbar CT scan include:
- back pain accompanied by fever
- birth defects affecting the spine
- a herniated disk
- injury to the lower spine
- low back pain
- multiple sclerosis
- a pinched nerve
- problems controlling the bladder
- signs of cancer
- spinal surgery preparation
- weakness, numbness, or other problems with your
A CT scan is not the same as an MRI. An MRI of the lumbar spine
shows the bones, disks, and spinal cord. MRIs can also show the spaces between
the vertebral bones that nerves pass through.
Risks Of A Lumbar Spine CT Scan
A lumbar spine CT scan carries very few risks. The contrast dye
used during the procedure may cause temporary kidney damage, though. This risk
is higher if your kidneys have already been damaged by disease or infection. Newer
dyes carry much less risk to the kidneys. Allergic reactions are also extremely
As with any X-ray, there’s some exposure to radiation. Although
it’s typically harmless, this is an important issue for women who are pregnant
or could be pregnant. The amount of radiation used is considered safe for
adults, but not for a developing fetus and should be used with caution in
To Prepare For a Lumbar Spine CT Scan
A lumbar spine CT scan is a noninvasive test.
You may want to wear loose, comfortable clothing because you’ll be
required to lie down on a table. You’ll also be instructed to remove any
jewelry and other metallic items from your body. Tell your doctor if you have
any metal implants from prior procedures.
Before going into your CT scan, tell your doctor if you have any
of the following conditions:
- allergy to oral contrast (barium)
- diabetes, as fasting may lower your blood sugar
A Lumbar Spine CT Scan Is Performed
CT scans are performed in a hospital’s radiology department or at
a clinic that specializes in diagnostic procedures.
A technician will ask you to lie on your back during the test. The
technician may use pillows or straps to ensure that you stay in the correct
position long enough for a quality image to be obtained. You may also have to
hold your breath during brief individual scans.
Using a remote from a separate room, the CT technician will move
the table into the CT machine. You may go through the machine several times.
Depending on the reason for your scan, you may be hooked up to an
IV so that contrast dye can be injected into your veins during the test. This
dye helps the machine take clear images of your blood vessels and organs.
After a round of scans, you may be asked to wait while the
technician reviews the images to ensure they are clear enough that your doctor
can read them correctly.
A typical CT scan takes between 30 and 45 minutes to complete.
a Lumbar Spine CT Scan
After the test, you can change back into your street clothes and
go about your day.
Results from a CT scan typically take a day to process. Your
doctor will schedule a follow-up appointment to discuss the results of your
scan. Your doctor will also tell you how to proceed depending on the findings. Additional
imaging scans, blood tests, or other diagnostic measures may be ordered. These
can help you receive an accurate diagnosis and begin treatment.