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A kidney, ureter, and bladder (KUB) X-ray may be performed to assess the abdominal area for causes of abdominal pain, or to assess the organs and structures of the urinary and/or gastrointestinal (GI) system. A KUB X-ray may be the first diagnostic procedure used to assess the urinary system. X-rays use invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs on film. X-rays are made by using external radiation to produce images of the body, its organs, and other internal structures for diagnostic purposes. X-rays pass through body tissues onto specially treated plates (similar to camera film) and a "negative" type picture is made (the more solid a structure is, the whiter it appears on the film). Digital films and digital media are more commonly used now than the film media. Other related procedures that may be used to diagnose problems of the urinary organs of the abdomen include computed tomography (CT scan) of the kidney , kidney ultrasound , kidney scan , cystography , cystometry , cystoscopy , intravenous pyelogram , kidney biopsy , magnetic resonance imaging (MRI) , prostate ultrasound , retrograde cystography , retrograde pyelogram , uroflowmetry , and renal venogram .
The body takes nutrients from food and converts them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood. The urinary system helps the body to eliminate liquid waste in the blood called urea, and keeps chemicals, such as potassium and sodium, and water in balance. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys, where it is removed along with water and other wastes in the form of urine.
The kidneys remove urea from the blood through tiny filtering units called nephrons. Each nephron consists of a ball formed of small blood capillaries, called a glomerulus, and a small tube called a renal tubule. Urea, together with water and other waste substances, forms the urine as it passes through the nephrons and down the renal tubules of the kidney.
Facts about urine:
Reasons for the procedureA KUB X-ray may be performed to help diagnose the cause of abdominal pain, such as masses, perforations, or obstruction. A KUB X-ray may be taken to evaluate the urinary tract before other diagnostic procedures are performed. Basic information regarding the size, shape, and position of the kidneys, ureters, and bladder may be obtained with a KUB X-ray. The presence of calcifications ( kidney stones ) in the kidneys or ureters may be noted. There may be other reasons for your doctor to recommend a KUB X-ray. Risks of the procedureYou may want to ask your doctor about the amount of radiation used during the procedure and the risks related to your particular situation. It is a good idea to keep a record of your past history of radiation exposure, such as previous scans and other types of X-rays, so that you can inform your doctor. Risks associated with radiation exposure may be related to the cumulative number of X-ray examinations and/or treatments over a long period of time. Notify your health care provider if you are pregnant or suspect that you may be pregnant. Radiation exposure during pregnancy may lead to birth defects. There may be other risks depending on your specific medical condition. Be sure to discuss any concerns with your physician prior to the procedure. Certain factors or conditions may interfere with the accuracy of a KUB X-ray. These factors include, but are not limited to, the following: Before the procedure
During the procedureA KUB X-ray may be performed on an outpatient basis or as part of your stay in a hospital. Procedures may vary depending on your condition and your doctor's practices. Generally, a KUB X-ray follows this process:
While the X-ray procedure itself causes no pain, the manipulation of the body part being examined may cause some discomfort or pain, particularly in the case of a recent injury or invasive procedure, such as surgery. The radiologic technologist will use all possible comfort measures and complete the procedure as quickly as possible to minimize any discomfort or pain. After the procedureGenerally, there is no special type of care following a KUB X-ray. However, your doctor may give you additional or alternate instructions after the procedure, depending on your particular situation.
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