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After filtration, Cystatin C is reabsorbed and catabolized by the tubular epithelial cells, with only small amounts excreted in the urine. Cystatin C levels are therefore measured not in the urine, but in the bloodstream. Equations have been developed linking estimated GFR to serum cystatin C levels. [16]
The glomerular filtration rate (GFR) describes the volume of fluid filtered from the renal (kidney) glomerular capillaries into the Bowman's capsule per unit time. [3] Creatinine clearance (C Cr ) is the volume of blood plasma that is cleared of creatinine per unit time and is a useful measure for approximating the GFR.
In this case, cystatin C-based estimates of GFR, eGFR cystatin C, will be lower than creatinine-based estimates eGFR creatinine, so that a hypothesized condition, named shrunken pore syndrome, is identified by a low eGFR cystatin C /eGFR creatinine-ratio. [medical citation needed] [55] This syndrome is associated with a very strong increase in ...
Levey is known for developing the most widely used equations to estimate GFR (renal function) globally.He pioneered work with the MDRD Study Equation, [1] led the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI), which pooled measured kidney function CKD data from studies all over the world to develop equations to estimate kidney function from serum creatinine, cystatin C, and ...
They have used cystatin C for estimation of GFR in the clinical routine since 1994. [13] Grubb and coworkers have developed cystatin C-based GFR-estimating equations, which in several patient cohorts are superior in diagnostic efficiency to creatinine-based GFR-estimating equations, and, in contrast to creatinine-based GFR-estimating equations ...
Cystatin C is a protein that is freely filtered in the glomeruli before it is reabsorbed and catabolized in the renal tubular cells. Its serum level is independent of muscle mass, making more accurate at estimating GFR than creatinine serum levels. [citation needed]
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Blood creatinine concentrations may also be used alone to calculate the estimated GFR (eGFR). The GFR is clinically important as a measurement of kidney function . However, in cases of severe kidney dysfunction the CrCl rate will overestimate the GFR, because hypersecretion of creatinine by the proximal renal tubules will account for a larger ...
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