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The glomerular filtration rate is the flow rate of filtered fluid through the kidney. The creatinine clearance rate ( C Cr or CrCl ) is the volume of blood plasma that is cleared of creatinine per unit time and is a useful measure for approximating the GFR.
The Glomerular filtration rate (GFR) is regarded as the best overall measure of the kidney's ability to carry out these numerous functions. An estimate of the GFR is used clinically to determine the degree of kidney impairment and to track the progression of the disease. The GFR, however, does not reveal the source of the kidney disease.
In countries that do not use the CHEM-7 panel, a UEC typically does not include chloride or bicarbonate as standard components, but will often include an estimated glomerular filtration rate (eGFR), and in some laboratories, glucose is also not included but is available as a separate test.
99m Tc DTPA is filtered by the glomerulus and may be used to measure the glomerular filtration rate (GFR) (in a separate test), making it theoretically the best (most accurate) choice for kidney function imaging. [10] The extraction fraction of DTPA is approximately 20%, less than half that of MAG3. [9]
Para-aminohippurate (PAH) clearance is a method used in renal physiology to measure renal plasma flow, which is a measure of renal function. [citation needed]PAH is completely removed from blood that passes through the kidneys (PAH undergoes both glomerular filtration and tubular secretion), and therefore the rate at which the kidneys can clear PAH from the blood reflects total renal plasma flow.
To clinically stage the degree of damage in this (and any) kidney disease, the serum creatinine is determined and used to calculate the estimated glomerular filtration rate . Normal eGFR is equal to or greater than 90ml/min/1.73 m 2. [34] On biopsy, the following classification has been suggested by Tervaert et al.: [35]