Creatinine Clearance Test
Aug 20, †Ј A creatinine urine test measures the amount of creatinine in your urine. The test can help your doctor evaluate how well your kidneys are functioning. This is Author: Ann Pietrangelo. Mar 03, †Ј The urine creatinine test can reveal a lot about the health of your kidneys. If you have kidney disease, your levels will be low. On the other hand, exercising often, being muscular, and eating a meat-heavy diet can increase creatinine. Read on to understand how this .
The creatinine clearance test is an older test used to check your kidney function. This test allows your healthcare provider to look at samples of your urine and blood to see how much of the waste product Ч creatinine Ч is filtered out by your kidneys. Abnormal levels of creatinine in your urine and blood could point to an issue like kidney disease. Done in two parts, the creatinine clearance test involves collecting your urine over a hour period of time and then having your blood drawn.
These samples are then tested to see how much creatinine was filtered through your kidneys over the hour window. The results what income is not taxable on a federal return the test will be used in a mathematic formula that figures out your creatinine clearance. Creatinine clearance is one way to estimate your glomerular filtration rate GFRor how well the kidneys are filtering your blood.
The GFR is the main number used by your provider to how to figure out bmi body mass index how well your kidneys are working. The creatinine clearance test is not used very often any more. It has largely been replaced by the estimated GFR eGFR equations using creatinine levels in the blood Ч which means a hour urine collection is not needed. Creatinine is actually a waste product of creatine.
Creatine is a chemical that your body uses to supply your muscles with energy. As you muscles use energy the tissue that makes up your muscles breaks down. This natural breakdown of muscle tissue causes creatinine to be released into your bloodstream. This is when creatine becomes creatinine. Normally, creatinine is filtered out of your blood by your kidneys.
If you think of each organ in your body as having a job, the kidneys are the filters. Anyone can be at risk for a kidney disease at some point in their life. However, some people have a higher risk of developing a kidney problem than others. These risks can include:. The creatinine clearance test is done when your healthcare provider thinks that the eGFR result given with your blood creatinine level may not be accurate.
Examples includes when people have very little or a lot of muscle on their bodies. However, there are ways to check this, such as with the eGFR result using cystatin C, another blood test. As a result, creatinine clearance is rarely used in modern practice.
Kidney disease tends to be silent and, what is the square root 8 many people, there are no symptoms in the early stages.
However, as the disease progresses, you may experience a few symptoms. These can include:. The creatinine clearance test is to confirm the level of kidney function reported with the eGFR level.
Your healthcare provider will want to know how well your kidneys are working. The results of this test can lead to a diagnosis of kidney disease. Part of the creatinine clearance test is done at home and the other part in a lab. You will collect your urine over a hour period of time at home. During this time, you can still participate in your normal daily activities. You just need to stick to a schedule for collecting your urine samples and make sure not to miss any collections do not flush any urine.
The second part of the test involves having your blood drawn. Your provider will give you directions on where to go to for the blood test when you pick up your test materials. Often, you will drop off your urine collection when you go to get your blood drawn. Before the creatinine clearance test, your healthcare provider will give you specific instructions. During the creatinine clearance test you will need to collect what is a creatinine urine test urine for 24 hours and then your blood will be drawn.
Make sure you collect urine throughout the test. You may also be asked to stop taking some medications. These medications could include:. Make sure to let your provider know about any medication you are taking and make sure there is a complete list of all medications you are taking in your medical record. Never stop any medication without first talking to your healthcare provider.
In general, you can eat normally before and during the creatinine clearance test. However, you may be asked not to eat overnight.
Your provider may also ask you not to eat meat before the test. You will do the creatinine clearance test over 24 hours. During this time, you will collect your urine each time you urinate.
This will give your healthcare provider a good idea of your creatinine levels throughout the entire day. Make sure to follow the directions from your healthcare provider closely. These instructions will include details about how to store your urine sample and where you will take it when the test is over. After 24 hours of collecting your urine, you will need to have your blood drawn.
This second part of the test looks at the amount of creatinine in your bloodstream. This is called serum creatinine. Your results from both of these tests will be plugged into a mathematic formula that determines your creatinine clearance. This rate tells your provider just how well what is the difference between e- books and e- journals kidneys are filtering waste products out of your bloodstream.
If you skip one urine collection, it could affect the test results. The creatinine clearance test is generally painless. The first part of the test involves normal urination over a hour period of time.
You might experience some discomfort from the needle when you have your blood drawn. This is a necessary part of the test and happens quickly. Some people describe having their blood drawn as a stinging feeling. However, all of this discomfort goes away quickly. The creatinine clearance test is generally a reliable test. Creatinine clearance is only an estimate of GFR, and in some cases can provide a result that is higher than what your GFR really is.
In addition, there are a few reasons that the results could be wrong. These include:. Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Creatinine Clearance Test The creatinine clearance test checks your kidney function by looking at the amount of creatinine in your urine and blood.
Abnormal levels of creatinine could be a sign of kidney failure. Urology What is creatinine? Why do I need to have the creatinine clearance test? These risks can include: Age you could be at a higher risk after age High blood pressure hypertension. Family history of kidney disorders. When is the creatinine clearance test done? Are there any symptoms associated with a high creatinine level? These can include: Swelling.
Fatigue feeling tired. Changes in how often you urinate. Loss of appetite. Why is the creatinine clearance test done? Test Details Is the creatinine clearance test done at home? What do I need to do to prepare for the creatinine clearance test? These medications could include: Antibiotics Bactrim. Stomach acid pills such as famotidine. Do I need to fast not eat before the creatinine clearance test?
What happens during the creatinine clearance test? What happens if I forget to collect one urine sample during collection? Will I feel any pain during the creatinine clearance test? Results and Follow-Up Can the creatinine clearance test be wrong? Show More.
What is creatinine?
This test measures the level of a substance called creatinine in your urine. Creatinine is a waste product that your body makes when you use your muscles. It's also made when your body digests meat. Healthy kidneys remove creatinine from your blood, and it leaves your body in your urine. The creatinine clearance test is an older test used to check your kidney function. This test allows your healthcare provider to look at samples of your urine and blood to see how much of the waste product Ч creatinine Ч is filtered out by your kidneys.
The creatinine urine test measures the amount of creatinine in urine. This test is done to see how well your kidneys are working. After you provide a urine sample, it is tested in the lab.
If needed, your doctor may ask you to collect your urine at home over 24 hours. Your health care provider will tell you how to do this. Follow instructions exactly so that the results are accurate. Your provider may tell you to temporarily stop taking certain medicines that may affect test results.
Be sure to tell your provider about all the medicines you take. These include:. Creatinine is a chemical waste product of creatine.
Creatine is a chemical the body makes to supply energy, mainly to muscles. This test is done to see how well your kidneys work. Creatinine is removed by the body entirely by the kidneys. If kidney function is not normal, creatinine level in your urine decreases. Results depend on your age and amount of lean body mass. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.
Talk to your doctor about the meaning of your specific test results. Landry DW, Bazari H. Approach to the patient with renal disease. Goldman-Cecil Medicine. Philadelphia, PA: Elsevier; chap Oh MS, Briefel G. Evaluation of renal function, water, electrolytes, and acid-base balance.
St Louis, MO: Elsevier; chap Updated by: David C. Editorial team. Creatinine urine test. Creatinine can also be measured by a blood test.
How the Test is Performed. How to Prepare for the Test. These include: Antibiotics such as cefoxitin or trimethoprim Cimetidine DO NOT stop taking any medicine before talking to your provider. How the Test will Feel. The test involves only normal urination. There is no discomfort. Why the Test is Performed. This test can be used for the following: To evaluate how well the kidneys are working As part of the creatinine clearance test To provide information on other chemicals in the urine, such as albumin or protein.
Another way of expressing the normal range for test results is: 14 to 26 mg per kg of body mass per day for men What Abnormal Results Mean. Abnormal results of urine creatinine may be due to any of the following: High meat diet Kidney problems, such as damage to the tubule cells Kidney failure Too little blood flow to the kidneys, causing damage to filtering units Kidney infection pyelonephritis Muscle breakdown rhabdomyolysis , or loss of muscle tissue myasthenia gravis Urinary tract obstruction.
Alternative Names. Female urinary tract Male urinary tract Creatinine tests Creatinine urine test. Health Topics A-Z Read more. Easy-to-Read Materials Read more.
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