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A 41-year-old female asked:

how accurate is a ct scan?

2 doctor answers2 doctors weighed in
Dr. Peter Nefcy
Radiology 39 years experience
Difficult to say: A CT scan is a mathematical model of the inside of whatever body part is being scanned, based on the measurement of attenuation of the x-ray beam from multiple points on the outside. The accuracy is determined by whether a specific size abnormality can be seen, which varies with different diseases. A CT abnormality seen is accurate, but the disease causing this may not be easily determined.
Dr. Michael Gabor
Diagnostic Radiology 33 years experience
It depends on: the potential abnormality being assessed, assuming an appropriate and technically adequate CT scan was performed.

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CA
A 39-year-old member asked:

Do I have to bring someone along, or can I drive after a CT scan?

1 doctor answer4 doctors weighed in
Dr. Valentin Drezaliu
Obstetrics and Gynecology 20 years experience
Drive after CT scan: If you had no medication prior ct scan it is safe to drive back home. If you had medication for anxiety, pain, you should have someone with you to drive back home.
A 31-year-old member asked:

Can a CT scan without contrast be accurate?

2 doctor answers4 doctors weighed in
Dr. Steven Chmielewski
Diagnostic Radiology 30 years experience
Depends.: For kidney stones we use no contrast, but we don't get as good a look at the solid organs. Contrast is usually helpful, but not always necessary.
AZ
A 27-year-old female asked:

Is a CT scan without contrast less accurate than one with contrast?

1 doctor answer1 doctor weighed in
Dr. Michael Gabor
Diagnostic Radiology 33 years experience
It depends: what kind of CT is being performed and for what purpose. for certain indications, adding contrast offers no significant diagnostic benefit. For other indications, contrast is essential and the diagnosis cannot be made without it. What kind of CT are you talking about, and what is your doctor looking for?
A 50-year-old member asked:

What is CT scan used for?

2 doctor answers6 doctors weighed in
Dr. James Bronk
Radiology 40 years experience
Multiple indications: CT is very widely used in diagnosis, from evaluation of the nervous system to cardiac and lung pathology to abdominal diseases and even musculoskeletal assessments.
Houma, LA
A 25-year-old male asked:

Is a VQ SCAN close to as accurate as CT scan at ruling out PE? What if the PE has been present for a while and its not a massive PE? What are the chances it would be overlooked or missed? Can this be done in the ER?

1 doctor answer2 doctors weighed in
Dr. Amrita Dosanjh
Pediatrics and Pediatric Pulmonology 36 years experience
Either/CT usually: Either diagnostic test may be used to determine if there is a PE. If the patient can not tolerate iv contrast, no CT available, concerns about radiation, a VQ is a good first step in the work up.

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Last updated Jan 5, 2020

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