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Doctor insights on: Does A Ct Or Ultrasound Always Show Kidney Stones

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Does a CT or ultrasound always show kidney stones?

Does a CT or ultrasound always show kidney stones?

No: Ct and ultrasound does not "always" show kidney stones. The resolution may not be sensitive enough to see very small stones less than 2 to 3 mm. Depending on the thickness of the images on the ct scan, a stone may be potentially missed between the images taken by the ct scanner. Ultrasound may also over-read or miss very small stones as well. Overall though, the detection rate is still very hi. ...Read more

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Dr. Michael Gabor
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Sonogram (Definition)

An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more


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It it possible for kidney stones to show up on ultrasound and not of CT scan if so what kind of stones would they be (uric acid)?

It it possible  for kidney stones to show up on ultrasound and not of CT scan if so what kind of stones would they be  (uric acid)?

Uric acid stones: yes, this is possible: Uric acid stones are not very radio-opaque - so plain XRAY miss them; so might CT, unless contrast is used. Ultrasound will not miss them, unless small - less than 5 mm ...Read more

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Blood in urine reoccuing UTI CT scan 3mm kidney stone bladder ultra sound scan shows bladder not emptying proper what could this be?

Blood in urine reoccuing UTI CT scan 3mm kidney stone bladder ultra sound scan shows bladder not emptying proper what could this be?

Cystitis.: Gross hematuria probably as a result of cystitis caused by the bladder outlet narrowing or stenosis and not because of the kidney stone. By drinking more water like 8 cups a day you can pass the kidney stone. For the cystitis you need urine culture . Until the culture result comes back you can be put on an antibiotic such as cipro (ciprofloxacin) to stop the gross hematuria. ...Read more

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Hi dr! i want to ask.. is it possible that a kidney stones was seen in ultrasound but can't be seen in ct scan with contrast?

Yes, because: it had probably passed in the meantime. Small stones generally pass. Most important for you is to prevent recurrence of stones. ...Read more

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Could you tell if you had pkd or other kidney problems with a CT scan or ultrasound?Have had same kidney stone for years and I thought theycane out

Could you tell if you had pkd or other kidney problems with a CT scan or ultrasound?Have had same kidney stone for years and I thought theycane out

Some (larger): kidney stones do not "come out" or are a part of the kidney's structure, CT or ULTRASOUND is/are good tests to disclose kidney STONES but are not generally sufficient to study kidney disease which requires blood/urine tests and sometimes renal BIOPSY! Hope this is helpfu Dr Z ...Read more

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Due to kidney stones I have had 2 ultrasounds, 2 ct's and 1 MRI w/contrast in past year. If I had pancreatic cancer would one of these picked it up?

Due to kidney stones I have had 2 ultrasounds, 2 ct's and 1 MRI w/contrast in past year.  If I had pancreatic cancer would one of these picked it up?

Whether the: CTs or MRI you had would be sensitive in detecting a small pancreatic cancer would depend on the technical parameters of the scans, so without additional information it is difficult to say. Large tumors would not be missed, small tumors might not be detectable if the scan was tailored for other purposes. ...Read more

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Urologist ordered CAT bc blood in urine and an earlier ultrasound that showed 4 kidney stones. What body parts will show up in the CAT scan?

Urologist ordered CAT bc blood in urine and an earlier ultrasound that showed 4 kidney stones. What body parts will show up in the CAT scan?

Abdomen and pelvis: The CT scan ordered when a patient has blood in the urine is of the abdomen and pelvis. It will show the kidneys, ureters, bladder and will also incidentally show the liver, lower lobes of lungs and spleen. Normally contrast is given intravenously when checking on urinary bleeding. Best wishes. ...Read more

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Is a kidney ultra sound good for spotting kidney stones or just it be a CT scan?

Is a kidney ultra sound good for spotting kidney stones or just it be a CT scan?

Yes and no...: Non-contrast ct is superior to ultrasound for kidney stones. Some stones will be visible on ultrasound, but the majority will not. Ultrasound will show if you have hydronephrosis (swelling or distension of the kidney collecting system for urine) which can suggest a blockage that may be due to a kidney stone. Hope this helps! ...Read more

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Would it be weird if I passed up a CT scan and requested a sonogram instead to check for kidney stones?

Would it be weird if I passed up a CT scan and requested a sonogram instead to check for kidney stones?

Not necessarily...: Ct is the most sensitive test to look for kidney stones. Very small stones or stones outside the kidney (i.e., in the ureters or pelvis) can be missed by ultrasound. If worried about radiation, there is a low dose protocol for ct that can be used to look for stones. The amount of radiation exposure for low dose ct is about the same as a plain x-ray. Ask the imaging center if they perform this. ...Read more

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Micro blood urine weeing about 4 times a night ultra sound CT culture fine 3mm kidney stone left kidney?

Micro blood urine weeing about 4 times a night ultra sound CT culture fine 3mm kidney stone left kidney?

Kidney Stone: This may certainly produce blood in the urine. Blood in urine is due to stones, cancer, tuberculosis, bacterial infections or severe kidney damage until proven otherwise. See a knowledgeable physician. ...Read more

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Urologist suggests CT scan after xray and sonogram suggest kidney stones, but he saw only "shadow." Is CT scan necessary to confirm stones? No pain.

CT scans are: more accurate than ultrasound for diagnosis of kidney stones and other anatomical abnormalities of kidneys such as tumors. If you are having painless hematuria, this condition raises suspicion of possible tumor in urinary tract. ...Read more

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Went to ER knowing was kidney stones X-ray Im fine. Since had ultra sound and ct w/cont now have fractured ribs? How can this be? No fall/blow to ribs

Need more info...: Why & when did you go to ER for x-ray? What is the interval between x-ray & US+CT? ... More in history? Besides, finding of physical exam is needed. How to unveil the puzzle inside your clinical profile? Follow instructions/ steps described in http://formefirst.com/eNewsletter06.html; thereby you can surely work with doc to deduce right diagnosis for right care. Best ... ...Read more

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Do all kidney stones show on a ct?

Do all kidney stones show on a ct?

Yes: Yes, a non-contrast ct scan is very sensitive for even tiny stones. Unlike plain x-ray, even non-calcific uric acid stones generally can be identified. ...Read more

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Would kidney stones show up on a CT scan if i hadn't been given contrast fluids to drink?

Would kidney stones show up on a CT scan if i hadn't been given contrast fluids to drink?

yes!: Yes- that is exactly how a ct for renal stones should be performed- with oral or IV contrast. ...Read more

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Can I tell if kidney stone has transited from ureter to bladder by change in symptoms?CT scan shows a 4mm stone 1.5 CM from bladder.

Can I tell if kidney stone has transited from ureter to bladder by change in symptoms?CT scan shows a 4mm stone 1.5 CM from bladder.

See answer: The only true accurate means of determining whether a ureteral calculus has passed is to retrieve it by straining your urine. The chance of spontaneous passage of a 4mm stone ~50-60%. Onset of symptoms of urinary urgency, frequency, burning, voiding small volumes usually indicates the stone is at the UVJ (ureter meets bladder). The absence or disappearance of pain does not guarantee stone passage. ...Read more

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I have gross hematuria. I think I passed a kidney stone since it's did not show on the last ultrasound. How long does the blood show after stone pass?

I have gross hematuria. I think I passed a kidney stone since it's did not show on the last ultrasound. How long does the blood show after stone pass?

Afew days but: The stoen may have passed but continued blood could indicate another stone of some other reason. Yoy need to discuss this with your physician ...Read more

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Please tell me, could a kidney stone not show on ultrasound?

Please tell me, could a kidney stone not show on ultrasound?

Some may not: Some kidney stones may not show on ultrasound .If the stones are less than 3mm the ultrasound exam may not be able to detect in some cases cat scan is the standard test used in us to diagnose kidney stones, but it does involve risk of radiation as compared to ultrasound. ...Read more

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Does a CT scan always show iup kidney stones?

Does a CT scan always show iup kidney stones?

Not always: This does depend on the size of the kidney stone and the way the study is performed. Suffice it to say almost always ...Read more

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How well do kidney stones show in a CT scan without contrast?

How well do kidney stones show in a CT scan without contrast?

Very Well: Almost all kidney stones show up extremely well on a non-contrasted ct scan. A stone that was composed entirely of protein matrix may not show but the typical calcium oxalate, calcium phosphate, and uric acid stones show up very well. ...Read more

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Dr. Creighton Wright
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Computed Tomography (Definition)

Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! the image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more


Kidney (Definition)

The kidneys are paired organs that lie on either side of the vertebral column. Part of their critical functions include the excretion of urine and removal of nitrogenous wastes products from the blood. They regulate acid-base, electrolyte, fluid balance and blood pressure. Through hormonal signals, the kidneys control the ...Read more