Urinary casts are tiny tube-shaped particles made up of white blood cells, red blood cells, or kidney cells. They form in kidney structures called tubules. Casts are held together by a protein released by the kidney. The content of a cast can tell your health care provider whether your urine is healthy or abnormal.
Types of urinary casts include:
Hyaline casts; Granular casts; Renal tubular epithelial casts; Waxy casts; Casts in the urine; Fatty casts; Red blood cell casts; White blood cell casts
How the test is performedA clean-catch (midstream) urine sample is needed, preferably the first morning urine sample. For information on how to collect this sample, see: Clean-catch urine culture
How to prepare for the testNo special preparation is needed.
How the test will feelThe test involves only normal urination, and there is no discomfort.
Why the test is performedYour doctor may order this test to see if your kidneys are working properly and to check for certain conditions such as kidney infections, glomerular disease, and interstitial kidney disease.
Normal ValuesThere are different types of casts. The presence of a few hyaline casts is normal.
What abnormal results meanAbnormal results may include:
This test may also show:
There are no risks.
Hyaline casts, or urinary casts, are cylinders of protein that have been dislodged and passed through the urinary tract. They are telling signs of kidney disease.
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Abnormal casts in urine are cylindrical structures formed in the renal tubules, typically composed of proteins, cells, or other substances. Their presence can indicate various kidney conditions, such as glomerulonephritis, acute tubular necrosis, or urinary tract obstructions. Common types of abnormal casts include red blood cell casts, white blood cell casts, and granular casts, each suggesting different underlying pathologies. The identification of these casts during urinalysis can aid in diagnosing renal diseases and monitoring kidney health.
Casts in a urinalysis are cylindrical structures formed in the kidney tubules and shed into the urine. They can indicate various conditions, such as kidney disease, dehydration, or urinary tract infections, depending on their composition and appearance under a microscope. Types of casts include hyaline, granular, cellular, fatty, waxy, and mixed casts.
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Orthopedic technologists put casts and splints on people.
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