Renal disease often progresses undetected, because kidney impairment does not cause pain. This is why chronic kidney disease is not diagnosed until patients show symptoms of an advanced stage of the disease. In the early stages of disease, laboratory testing is the most efficient and sensitive way to detect reduction in renal function.1
Cystatin C shows increased sensitivity to renal dysfunction compared to serum creatinine, especially in the early stage of kidney disease characterized by a mild reduction in glomerular filtration rate.
The N Latex Cystatin C Assay:
Is suitable for both serum and plasma specimens
Has low imprecision (total CV <5%)
Runs on the Atellica® NEPH 630 System2, BN™ II System, and BN ProSpec® System
Features & Benefits
Cystatin C is a nonglycated, low-molecular-weight (13 kDa) protein that is synthesized by all nucleated cells. It is produced at a constant rate regulated by a housekeeping gene.3 Cystatin C is freely filtered by the glomerulus, and there is no tubular secretion or any extrarenal elimination. In addition, cystatin C is not affected by muscle mass, diet, gender, or inflammation.
The relevance of determining cystatin C for diagnosis in CKD is included in the international KDIGO (Kidney Disease Improving Global Outcomes) guidelines.
No tubular secretion; sensitive in the creatinine-blind range3
Higher sensitivity in early disease
Independent of age, sex, and muscle mass3
Constant relationship between cystatin C and glomerular filtration rate (GFR) at 1 year of age and older
Single reference range: 0.62–1.11 mg/L in children and adults ranging in age from 1 to 78 years
Sensitive detection of declining GFR with aging