What is the first preferred diagnostic test for a patient suspected to have kidney tumors?
Consumer Summary Jul 29, 2016 Show
OverviewYou have come to the emergency department and the emergency doctor has recommended an imaging test to check for kidney stones. This summary will tell you about two types of imaging tests—a CT scan (computed tomography scan) and an ultrasound. Kidney Stones and Possible SymptomsThe kidneys are bean-shaped organs that filter the waste chemicals out of your blood and make urine. A kidney stone is a hard piece of material that forms inside your kidney when tiny mineral crystals in your urine stick together. Symptoms of kidney stones may include:
Checking for Kidney Stones in the Emergency DepartmentFirst, the emergency doctor will give you medicine to help stop your pain. The medicine may be given by mouth. Or, it may be given through an intravenous (IV) needle placed in a vein in your arm. You may also be given medicine to help stop your nausea and vomiting. If you are dehydrated from vomiting, you may be given liquids through an IV tube. Next, the emergency doctor will talk with you about your symptoms and medical history. If the emergency doctor thinks you might have a kidney stone, several tests may be done. These may include:
Imaging Tests To Check for Kidney StonesTwo imaging tests to check for kidney stones are a CT scan and an ultrasound. If the first imaging test is not clear, you may need a second test. In the past, a CT scan was often used as the first imaging test to check for kidney stones. But, because a CT scan exposes people to radiation, the emergency doctor may suggest an ultrasound instead as the first imaging test. Questions About Imaging Tests To Check for Kidney Stones
What Researchers FoundBoth CT and ultrasound find most kidney stones.Whether you have an ultrasound or a CT scan first:
Having an ultrasound first may help you avoid being exposed to radiation from a CT scan.
Note: If you and the emergency doctor decide on a CT scan, ask if it is possible to get a low-dose CT scan. Low-dose CT works as well as normal-dose CT to check for kidney stones and exposes you to less radiation. Talking with the Emergency Doctor About Your Options for Imaging TestsTalk with the emergency doctor about whether it might be better to have an ultrasound or a CT scan first to check for kidney stones. You may want to think about:
Next Steps If a Kidney Stone Is FoundIf a kidney stone is small enough, it can move or "pass" through your urinary tract and out of your body on its own. If the stone cannot pass on its own, you may need treatment. Large stones can get stuck in either a kidney or a ureter. A stone that becomes stuck may cause pain that does not go away and may damage the kidney if it is not treated. If the emergency doctor thinks the kidney stone will pass on its own without any problems:
If the emergency doctor thinks the kidney stone will not pass on its own or may cause problems:
If your nausea and vomiting do not stop: You may need to stay in the hospital. Can Kidney Stones Come Back?After the kidney stone has passed or after it is removed, another stone may form. People who have had a kidney stone in the past are more likely to get another stone in the future. If you have had a kidney stone, talk with your health care professional about your risk of getting another one. Ask your health care professional what steps you can take to lower your risk of getting another kidney stone. SourceThe information in this summary comes from the research article, "Ultrasonography Versus Computed Tomography for Suspected Nephrolithiasis," published in The New England Journal of Medicine, September 18, 2014. The research was done by Rebecca Smith-Bindman and her colleagues through funding by the Agency for Healthcare Research and Quality. Additional information came from:
This summary was prepared by the John M. Eisenberg Center for Clinical Decisions and Communications Science at Baylor College of Medicine, Houston, TX. It was written by Amelia Williamson Smith, M.S., Rebecca Smith-Bindman, M.D., Ralph Wang, M.D., and Michael Fordis, M.D. AHRQ Publication number: 16-EHC008-A-EF How are kidney tumors diagnosed?Imaging tests allow your doctor to visualize a kidney tumor or abnormality. Imaging tests might include ultrasound, X-ray, CT or MRI . Removing a sample of kidney tissue (biopsy). In some situations, your doctor may recommend a procedure to remove a small sample of cells (biopsy) from a suspicious area of your kidney.
What is the best test to detect kidney cancer?Percutaneous Biopsy
CT and MRI scans are usually the only tests doctors need to diagnose kidney cancer. Sometimes, though, doctors perform what's known as a percutaneous biopsy if they need more information about a tumor before making a treatment recommendation.
What is the most accurate test for kidney function which sample is best for test?Urine Tests
A 24-hour urine test shows how much urine your kidneys produce, can give an more accurate measurement of how well your kidney are working and how much protein leaks from the kidney into the urine in one day. Includes microscopic examination of a urine sample as well as a dipstick test.
How is early kidney cancer diagnosed?Imaging tests such as computed tomography (CT) scans and magnetic resonance imaging (MRI) scans can often find small kidney cancers, but these tests are expensive. Ultrasound is less expensive and can also detect some early kidney cancers.
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