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Doctor insights on: Ultrasound False Positive For Kidney Stones

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Experienced my 2nd kidney stone yesterday. How can I prevent passing another? I'm 26 years old, and yesterday i passed a kidney stone. This was my second experience with a kidney stone, as i also passed one about 15-months ago. As anybody that has experie

Experienced my 2nd kidney stone yesterday. How can I prevent passing another? I'm 26 years old, and yesterday i passed a kidney stone. This was my second experience with a kidney stone, as i also passed one about 15-months ago. As anybody that has experie

Diet modification: You can have your urine analyzed for kidney stone risk factors. My usual recommendations are 1) increase plain water to at least 2 liters a day 2) decrease sodium intake 3) decrease animal protein intake 4) add a teaspoon of real lemon juice to diet daily. ...Read more

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Dr. Michael Gabor
2,244 doctors shared insights

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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Do ultrasounds ever miss kidney stones?

Do ultrasounds ever miss kidney stones?

Yes frequently: Small stones can easily be missed, by any ultrasound machine especially by office ultrasound machines. Spiral ct scan is the most reliable imaging tool for small kidney stones. Flank pain & microscopic blood in urine are frequently good clues to presence of stones. Good news is that small kidney stones usually pass spontaneously & require no intervention. ...Read more

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Can kidney stones be found with an ultrasound?

Can kidney stones be found with an ultrasound?

Yes: Ultrasound may not see the stone well but may see swelling in the tube (ureter) where a stone has clogged up the drain. A cat scan (ct) is usually the preferred test to better see the stones. But, unlike ultrasound exposes you to some radiation. ...Read more

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Is a catscan or ultrasound better for seeing kidney stones?

Is a catscan or ultrasound better for seeing kidney stones?

Depends: For renal stones (in kidney), ultrasound is usually adequate. Can also see dilation of the kidney when stone is blocking the outflow tube (ureter). For better clear picture and to see ureteral stones which are closer to bladder, ct scan is better. However, all ctscans must be considered carefully given the radiation exposure to the patient which ultrasound does not have. ...Read more

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What else can look like lots of small kidney stones in ultrasound?

Calcifications: Calcifications in blood vessels can sometimes look like kidney stones. If your doctors are unclear about whether or not you have kidney stones they may want to do a CT scan which is a better test than US for detecting and diagnosing kidney stones. ...Read more

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My fiancee got a kidney stone of 6mm in size according to the ultrasound, is it possible to pass it without surgery?

My fiancee got a kidney stone of 6mm in size according to the ultrasound, is it possible to pass it without surgery?

Ureteral stone: The size of the stone does not correlate well to the intensity of the pain. The nearly unbearable pain of "ureteral colic" is from spasm of the muscular ureter. Although likely to pass on its own within a few days, a 3mm stone sometimes will get stuck and fail to progress. A 6mm stone, less likely usually after 5 days, i recommend having the stone extracted with a ureteroscope as an outpatient. ...Read more

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I recently had an ultrasound of my right kidney where a kidney stone was found along with a 3mm bright echo was found. Should i be concerned?

I recently had an ultrasound of my right kidney where a kidney stone was found along with a 3mm bright echo was found. Should i be concerned?

Probably not...: Increased use of us or ct to evaluate body pain had led to finding small asymptomatic stone or mass in kidneys, lungs, liver, etc. Which is incidental and poses substantial dilemma on how to handle these subclinical findings. For kidney stone of 3 mm, i would leave it alone if you have no stone-related symptoms., but followed yearly with a x-ray film (kub). More detailing, work with urologist. ...Read more

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25 yr old male has had kidney stones and is experiencing similar pain.ultrasound & urine showed no stones.Pain is getting worse.other possibility?

Maybe more imaging: CT scan of abdomen without contrast adminstration is more sensitive for detecting small stones than ultrasound. CT with contrast could demonstrate other causes of pain. ...Read more

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Is it possible to have kidney stones, but not have any evidence of them in urine samples or ultrasounds?

Is it possible to have kidney stones, but not have any evidence of them in urine samples or ultrasounds?

Yes: These stones may be too small see on ultrasound and a routine urinalysis may easily miss stones as well. The best test for diagnosing the majority of stones in the urinary tract is a ct scan without contrast. This will detect the majority of kidney stones but a few may be missed occasionally. ...Read more

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What are the signs of a kidney stone on ultrasound?

What are the signs of a kidney stone on ultrasound?

Bright spots: Kidney stones show up on ultrasound as bright echogenic foci (white spots) within the substance of the kidney. If the stones are larger than 3 or 4 mm there will be a darker area behind the stone representing an acoustical shadow. Obstruction of the kidney by a stone will cause dilatation of the kidney's collecting system which will appear as black fluid spaces within the kidney. ...Read more

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Are kidney stones not able to be seen in ultrasounds?

Are kidney stones not able to be seen in ultrasounds?

Kidney stones: While kidney stones often are seen on renal ultrasound, it is a rather vague image at best. Most urologists rely on ct scans or ivp x-rays to identify and assess stones within the kidney or ureter. ...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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Describe an ultrasound procedure for kidney stones?

Describe an ultrasound procedure for kidney stones?

Easy peasy: Usually you will be asked to come with a full bladder. Gel will be placed on your skin and a tech will place a small device over the gel to take pictures, typically of your bladder first. It is painless. Then, you will likely be asked to empty bladder, then kidneys will be imaged same way. If you have ever seen a pregnant woman get an ultrasound it is the same thing, just in a different area. ...Read more

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Can a ultrasound show a kidney stone blockage thanks?

Can a ultrasound show a kidney stone blockage thanks?

Yes, depends on seve: If the blockage is complete & urine backs up into the kidneys, you can get a condition called hydronephrosis. This can be detected on ultrasound due to the dilation of the ducts in the kidneys (like stepping on a garden hose- water backs up & bulges). Ultrasound can miss a kidney stone due to its location or size; however, it can detect the *effects* of a kidney stone, by which diagnosis is made. ...Read more

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So are kidney stones fairly obvious on an ultrasound?

So are kidney stones fairly obvious on an ultrasound?

Ultrasound kid stone: 46F US asks "So are kidney stones fairly obvious on an ultrasound?" ANS: No. Most are too small but if the are blooking one or both kidneys that may be see. CT sees stones better. ...Read more

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What to do if I had a kidney stone and hydronephrosis last year, but when I do ultrasound this year?

Why not treated?: U hopefully consulted a urologist last year. Dr should have outlined a plan. U don't tell us whether the kidney stone was treated or not. We also do not know whether hydronephrosis was result of stone or not. Thus advise U contact urologist U saw before, or consult a urologist if U haven't done so before. ...Read more

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I had an ultrasound done and it showed a 6-7mm kidney stone. The X-ray showed clear. What one is right?

I had an ultrasound done and it showed a 6-7mm kidney stone. The X-ray showed clear. What one is right?

Stones : A small kidney stones detected by ultrasound can sometimes be missed in plain x-rays. You should go with the ultrasound results. they are small and in your case asymptomatic in many cases they pass on their own hydrate yourself well and read about diet that decreases future stone formation .. ...Read more

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What do you advise if i had a kidney stone and hydronephrosis last year, but when I do ultrasound this year?

What do you advise if i had a kidney stone and hydronephrosis last year, but when I do ultrasound this year?

Just...: For your clinical scenario, i would probably just review hx pertaining to stone clinical activity, get a kub if prior stone was radiopaque, and urinalysis, with US only for the first year after care for stone and its related hydronephrosis. That sounds reasonable. Detail? Ask urologist. ...Read more

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35 year old husband has 7mm kidney stone found on ultrasound by accident. He keeps getting these tiny stones. He has no symptoms. Is this serious?

35 year old husband has 7mm kidney stone found on ultrasound by accident. He keeps getting these tiny stones. He has no symptoms. Is this serious?

Urology evaluation: Lot of hydration ( 8-10 8 oz. glasses of water daily) plus acidify your urine with citric acid ( fresh fruit juices-OJ, lemon, lime. pineapple etc.) the citric acid will bind calcium crystals and 90% of all stones are made of calcium. ...Read more

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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


Kidney Stone (Definition)

Solutes precipitate and combine to form stones formed of calcium oxalate usually around a nidus of uric acid. Other solutes that form stones are ca and mg phosphates, cystine, and uric acid staghorn calculi form in the presence of chronic urinary tract infections. Stones can be painful, may require ...Read more