Why are a creatinine clearance test and a serum creatinine test done together?

To get proper result. Creatinine clearance testing procedure and what measured is fully answered in prior question. The serum creatinine must be drawn right after the 24 hour urine collection to calculate how much creatinine is in serum and compare it to the total creatinine in the urine collection, to get an accurate measurement of renal function.

Related Questions

I'm wondering why are both a creatinine clearance test and a serum creatinine test done?

Creatinine clearance. People who want to find out their renal function will collect a 24 hour urine for creatinine clearance. The blood sample is used to calculate the clearance of creatinine in the urine as it will be sent off for a creatinine level. Without it, the clearance of creatinine could not be calculated. The result of the test give the actual glomerular filtration rate of the patient. Read more...

Why are both a creatinine clearance test and a serum creatinine test done? Pain in the rear to collect.

See below. You are right, a collection of the 24 hour urine is cumbersome.It is possible to have a estimate of the GFR and creatinine clearance based on serum creatinine with a formula and tables which are easily available, which dose not require the urine collection. The 24 hour collection may be more accurate in extremes of weight etc and not necessary for most clinical scenarios. Read more...

Hi. Id like to know what 3.5mg/dl serum creatinine signify along with a creatinine clearance of 45?

Kidneys are failing. You have already lot most of your kidney function.U must see a Nephrologist,a Kidney and dialysis specialist.You don't need dialysis yet,but you are getting dangerously close.See if there is anything that can be done to slow down this advanced deterioration of this vital organ.Good luck. Read more...
Kidney problem. Creatinine clearance is a measure of kidney function. This organ filters the blood of waste. If optimally working, the clearance should be well over 90, and if it is lower, creatinine builds up in the serum. This can occur in longstanding kidney injury or after acute damage (both of which have many possible causes) Read more...

High value of creatinine clearance. Serum creatinine 0, 8mg/dl. Creat. Clearance 165ml/min. Normal value from 80 to130.What's the relevance of high value?

Don't worry. A high estimated GFR means nothing whateve except that the estimate has little to do with reality. The fad for estimating glomerular filtration rates in healthy people based on a correlation with serum creatinine is unscientific and has many pathologists and nephrologists unhappy. Ignore it. Read more...

My lab reports are serum creatinine 80, GFR 72, and creatinine clearance 69.9. my 24 hr urine creatinine was 6.9 and spot urine 2.2. What does it mean?

Not much. You're 55 years old and -- congratulations -- a recovered problem drinker. Unless you're especially fit or heavily-muscled, your creatinine may be a bit high and maybe your kidneys are getting old -- but this level is perfectly compatible with good health and if you had serious kidney disease, it would be a lot worse by now. Eat sensibly, stay fit and I bet your kidneys will last a lifetime. Read more...