The creatinine clearance test compares the level of creatinine in urine with the creatinine level in the blood. (Creatinine is a breakdown product of creatine, which is an important part of muscle.) The test helps provide information on kidney function.
Creatinine - blood test
Creatinine - urine test
How the test is performed
This test requires both a blood and urine sample. You will collect your urine for 24 hours, and then have blood taken.
For information on giving a blood sample, see: venipuncture .
For information on how to collect the urine sample, see: 24-hour urine collection .
The samples are sent to a laboratory. The laboratory specialist measures the level of creatinine in both the urine and blood samples, and looks at how much urine you collected in 24 hours.
The clearance rate is then calculated. The calculation is adjusted for your specific body size.
The creatinine clearance...
Definition 24-hour urine protein measures the amount of protein excreted in urine over a 24-hour period. See also: Bence-Jones protein test Alternative Names Urine protein - 24 hour How the test is performed A 24-hour urine sample is needed. On day 1, urinate into the toilet when you get up in the morning. Afterwards, collect all urine in a special container for the next 24 hours. On day 2, urinate into the container when you get up in the morning. Cap the container. Keep it in the refrigerator or a cool place during the collection period. Label the container with your name, the date, the time of completion, and return it as instructed. For an 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 the infant. For males, place the entire penis in the bag and attach the adhesive to the skin. For females, place the bag over the labia. Diaper as usual over the secured bag. This procedure may take a couple of a...
Definition Creatinine is a breakdown product of creatine, which is an important part of muscle. This article discusses the laboratory test to measure the amount of creatinine in the blood. Creatinine can also be measured with a urine test. See: Creatinine - urine Alternative Names Serum creatinine How the test is performed Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood. Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding. In infants or young children, a sharp tool called a lancet may be used to puncture the skin and mak...
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