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Urinary casts   

Overview | Risks | Results

Alternative names:

Hyaline cast; Granular casts; Renal tubular casts; Waxy casts; Casts in the urine; Fatty casts; Epithelial casts

Definition:

Urinary casts tests measure the presence and type of casts (small tubules) in urine.

How the Test is Performed

Child or adult:
Collect a "clean-catch" (midstream) urine sample. To obtain a clean-catch sample, men or boys should wipe clean the head of the penis. Women or girls need to wash the area between the lips of the vagina with soapy water and rinse well. As you start to urinate, allow a small amount to fall into the toilet bowl (this clears the urethra of contaminants). Then, in a clean container, catch about 1 to 2 ounces of urine and remove the container from the urine stream. Give the container to the health care provider or assistant.

Infant:
Thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on your infant. For males, the entire penis can be placed in the bag and the adhesive attached to the skin. For females, the bag is placed over the labia. Place a diaper over the infant (bag and all). Check your baby frequently and remove the bag after the infant has urinated into it. For active infants, this procedure may take a couple of attempts -- lively infants can displace the bag, causing an inability to obtain the specimen. The urine is drained into a container for transport back to the health care provider.

How to Prepare for the Test

No special preparation is necessary for this test, but if the collection is being taken from an infant, a couple of extra collection bags may be necessary.

How the Test will Feel

The test involves only normal urination, and there is no discomfort.

Why the Test is Performed

The test is performed to evaluate the presence of certain conditions, such as kidney infections, glomerular diseases, interstitial kidney diseases, and as part of the evaluation for abnormal kidney function.

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