10 doctors weighed in:
Can I still have kidney stones even if they don't show up on a CT scan?
10 doctors weighed in

Dr. Madhu Kandarpa
Internal Medicine - Nephrology & Dialysis
5 doctors agree
In brief: Small ones
Smaller than may be 5mm.

In brief: Small ones
Smaller than may be 5mm.
Dr. Madhu Kandarpa
Dr. Madhu Kandarpa
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Dr. Jason Hemming
Internal Medicine - Gastroenterology
3 doctors agree
In brief: ? contrast
Small stones can be missed.
But if the ct was not a stone-protocol (i.e. Done with contrast) then stones may be missed.

In brief: ? contrast
Small stones can be missed.
But if the ct was not a stone-protocol (i.e. Done with contrast) then stones may be missed.
Dr. Jason Hemming
Dr. Jason Hemming
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Dr. Susan Wingo
Internal Medicine - Endocrinology
2 doctors agree
In brief: Possible, not likely
Most kidney stones contain calcium and show up very clearly on ct scan.
Some, however, are made up of uric acid and don't show up directly. If they are blocking fluid from moving through the ureter, the ureter above the blockage will be stretched out or dilated, and this is easy to see on ct. So even though some stones don't show up, ones large enough to block the ureter can be detected.

In brief: Possible, not likely
Most kidney stones contain calcium and show up very clearly on ct scan.
Some, however, are made up of uric acid and don't show up directly. If they are blocking fluid from moving through the ureter, the ureter above the blockage will be stretched out or dilated, and this is easy to see on ct. So even though some stones don't show up, ones large enough to block the ureter can be detected.
Dr. Susan Wingo
Dr. Susan Wingo
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Dr. George Klauber
Pediatrics - Urology
2 doctors agree
In brief: Only tiny ones
Stones 3mm or greater should be visible on ct unless the "slices" are widely spaced.

In brief: Only tiny ones
Stones 3mm or greater should be visible on ct unless the "slices" are widely spaced.
Dr. George Klauber
Dr. George Klauber
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Dr. Edward Neilsen
Family Medicine
1 doctor agrees
In brief: Yes, but
Kidney stones that do not contain calcium may not show up very well on a ct.
However, these would need to be very small, so whether they are clinically signifcant is questionable. If the ct says no stone, the chances are good that either there is no stone, or it is too small to be worrisome.

In brief: Yes, but
Kidney stones that do not contain calcium may not show up very well on a ct.
However, these would need to be very small, so whether they are clinically signifcant is questionable. If the ct says no stone, the chances are good that either there is no stone, or it is too small to be worrisome.
Dr. Edward Neilsen
Dr. Edward Neilsen
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