Fractional Sodium Excretion Calculator is the percentage of the sodium filtered by the kidney which is excreted in the urine.It is measured in terms of plasma and urine sodium.It is useful in the evaluation of acute renal failure and oliguria.
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The creatinine clearance is a measure of the glomerular filtration rate (GFR), which is, the volume of filtrate made by the kidneys per minute. The creatinine clearance is calculated after measuring the volume of urine passed in 24 hours and the urine and serum creatinine levels.