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Function

This protein is the most widely used biomarker of kidney function. If kidney function and glomerular filtration rate decline, the blood levels of cystatin C rise. Also, the serum levels of cystatin C are a more precise test of kidney function than serum creatinine levels.

Disease

Cystatin C is an endogenous cysteine proteinase inhibitor. It belongs to the type 2 cystatin superfamily. The diagnostic value of cystatin as a marker of kidney of dysfunction has been researched in a lot of clinical studies on adults, children and the elderly.

In most of these clinical studies, cystatin C is turned out to be a better diagnostic accuracy than serum creatinine in discriminating normal from impaired kidney function. So cystatin C is a key factor to see if we diagnosis kidney diseases.

Besides, it has been studied for its role in predicting new-onset or deteriorating cardiovascular disease. Furthermore, it is also turned out to play a key role in brain disorders involving in amyloid, for example,Alzheimer's disease.

Relevance

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Cystatin C may be used as an alternative to creatinine and creatinine clearance to screen for and monitor kidney dysfunction in those with known or suspended kidney disease. It may be especially useful in the cases that creatinine test is not appropriate, for example, liver cirrhosis. Test the level of cystatin C is also useful in the early detection of kidney disease when other test results may still be normal and an affected may be few, look into more details.

Lots of scientists are in process of exploring other uses of cystatin C, for instance, use it alone normally or in combination with blood serum creatinine to estimate the glomerular filtration rate. A recent research found an equation for eGFR that includes both creatinine and cystatin C was more accurate than one that uses either one of them alone because it could be used to confirm chronic kidney disease in people with an eGFR near 60.

Structural highlights

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