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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.
Another formula for calculating the GFR is the one developed by the Modification of Diet in Renal Disease Study Group. [25] Most laboratories in Australia, [26] and the United Kingdom now calculate and report the estimated GFR along with creatinine measurements and this forms the basis of diagnosis of chronic kidney disease.
EGFR may refer to: Epidermal growth factor receptor (EGFR), a transmembrane receptor protein in humans Estimated glomerular filtration rate (eGFR), a measure of renal function
Many laboratories will automatically calculate eGFR when a creatinine test is requested. Algorithms to estimate GFR from creatinine concentration and other parameters are discussed in the renal function article. Unfortunately, the MDRD Study equation was developed in people with chronic kidney disease, and its major limitations are imprecision ...
In renal physiology, the filtration fraction is the ratio of the glomerular filtration rate (GFR) over the renal plasma flow (RPF). Filtration Fraction, FF = GFR/RPF, or =. The filtration fraction, therefore, represents the proportion of the fluid reaching the kidneys that passes into the renal tubules. It is normally about 20%.
The renal clearance ratio or fractional excretion is a relative measure of the speed at which a constituent of urine passes through the kidneys. [ 1 ] [ 2 ] It is defined by following equation: c l e a r a n c e r a t i o o f X = C x C i n {\displaystyle clearance\ ratio\ of\ X={\frac {C_{x}}{C_{in}}}}
Chronic kidney disease (CKD) can also develop slowly and, initially, show few symptoms. [16] CKD can be the long term consequence of irreversible acute disease or part of a disease progression. [ citation needed ] CKD is divided into 5 different stages (1–5) according to the estimated glomerular filtration rate (eGFR).
All people with a GFR <60 mL/min/1.73 m 2 for 3 months are defined as having chronic kidney disease. [59] Protein in the urine is regarded as an independent marker for worsening of kidney function and cardiovascular disease. Hence, British guidelines append the letter "P" to the stage of chronic kidney disease if protein loss is significant. [60]