Sage-Tips

Is the creatinine clearance test accurate?

For people with these individual factors, a creatinine clearance test is usually more accurate than a test of creatinine in your blood alone. Creatinine clearance can be used as a follow-up test if another type of kidney function test shows an abnormal result.

Why is creatinine clearance a good indicator of renal function?

Doctors use creatinine and creatinine clearance tests to check how well your kidneys work. This is called renal function. Testing the rate of creatinine clearance shows the kidneys’ ability to filter the blood. As renal function gets worse, creatinine clearance also goes down.

What does creatinine clearance test measure?

A creatinine clearance test measures how well creatinine is removed from your blood by your kidneys. This test gives better information than a blood creatinine test on how well your kidneys are working. The test is done on both a blood sample and on a sample of urine collected over 24 hours.

Is creatinine and creatinine clearance the same?

There is a difference between looking at creatinine in your bloodstream (called “serum creatinine”) and looking at creatinine in your urine (called “creatinine clearance”). These are two different lab tests. Serum creatinine is part of a routine lab report; creatinine clearance is not.

Why is creatinine clearance a more accurate determination of renal function in an elderly client than serum creatinine levels?

Studies have also shown that creatinine clearance overestimates GFR due to the secretion of creatinine from the tubules in normal individuals. In patients with CKD, there is increased extra-renal and decreased urinary elimination of creatinine leading to overestimation of GFR from serum creatinine.

Why is creatinine clearance better than GFR?

Creatinine clearance exceeds GFR because creati- nine is secreted by the proximal tubule as well as filtered by the glomerulus. Creatinine clearance can be measured from serum creatinine and cre- atinine excretion, or estimated from serum cre- atinine using estimating equations.

What is creatinine clearance?

Definition. The creatinine clearance test helps provide information about how well the kidneys are working. The test compares the creatinine level in urine with the creatinine level in blood.

How is kidney function measured?

Your kidney numbers include 2 tests: ACR (Albumin to Creatinine Ratio) and GFR (glomerular filtration rate). GFR is a measure of kidney function and is performed through a blood test. Your GFR will determine what stage of kidney disease you have – there are 5 stages.

What is a creatinine clearance test and why is it important?

What is the creatinine clearance test? 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 — creatinine — is filtered out by your kidneys.

What is the difference between GFR and creatinine clearance?

The GFR is the main number used by your provider to determine 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 — which means a 24-hour urine collection is not needed.

What is the difference between serum creatinine test and urine test?

A serum creatinine test measures the level of creatinine in your blood and provides an estimate of how well your kidneys filter (glomerular filtration rate). A creatinine urine test can measure creatinine in your urine.

What does it mean when your creatinine is high in urine?

Overview. If your kidneys aren’t functioning properly, an increased level of creatinine may accumulate in your blood. A serum creatinine test measures the level of creatinine in your blood and provides an estimate of how well your kidneys filter (glomerular filtration rate). A creatinine urine test can measure creatinine in your urine.