[Could cystatine C replace creatinine as a market of glomerular filtration rate?]

Area of Science:

• Nephrology
• Biochemistry
• Clinical Diagnostics

Context:

• Glomerular filtration rate (GFR) measurement is essential for diagnosing and monitoring early kidney impairment.
• Current standard methods like inulin clearance and radio-isotopes are not practical for routine use.
• Serum creatinine and creatinine clearance lack sensitivity for early detection and are affected by factors like obesity, malnutrition, and age.

Purpose:

• To evaluate cystatin C as a potentially more reliable marker for GFR estimation.
• To explore the utility of cystatin C in specific patient populations where creatinine-based markers are less accurate.
• To investigate cystatin C's role as a predictive factor for mortality, including cardiovascular events.

Summary:

• Cystatin C is a protein produced by nucleated cells, freely filtered by the glomerulus, and catabolized in the proximal tubule.
• Clinical studies suggest cystatin C offers improved GFR assessment accuracy compared to creatinine in certain patient groups.
• The molecule's potential as a prognostic biomarker for mortality, particularly cardiovascular risk, is also highlighted.

Impact:

• Cystatin C may enhance the early detection and management of renal impairment.
• It offers a more dependable alternative for GFR assessment in challenging clinical scenarios.
• Cystatin C could improve risk stratification for mortality, aiding in preventative cardiovascular care.