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 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...
[Science of Diabetes] One of the most common questions asked by people with diabetes is: “What are normal blood sugar levels?” Unfortunately, there’s no simple answer to this question, because it depends on how you define normal. It’s like deciding when someone is rich or poor, tall or short, thin or fat, or young or old. Most people would agree that a very skinny person was thin and a very fat person was fat. But how about the sizes in between? When does underweight become normal and when does normal become overweight? It’s all a matter of definitions and cutoff points set by one group or another. The definitions of normal, prediabetes, and diabetes are usually made by august committees of diabetes experts, and they change from time to time. For example, not too long ago, it was decided that you’re diabetic if your fasting BG level is 126 mg/dL [to convert to mMol/L, divide by 18] or higher, instead of the previous cutoff of 140. There are some guidelines about ...
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