Cystatin C is a protein produced by all nucleated cells that is filtered by the kidneys. It is used as an alternative to creatinine for estimating kidney function.
Category: Kidney Function
Also known as: cystatin c, cystatin-c, cys c, serum cystatin c
Reference range: 0.62–1.15 mg/L (Source: ABIM)
Standard unit: mg/L
High values may indicate
High cystatin C levels may indicate decreased kidney function, chronic kidney disease, or acute kidney injury.
Low values may indicate
Low cystatin C levels are uncommon and generally not clinically significant, though they may be seen with hyperthyroidism or corticosteroid use.