Adult reference ranges for serum cystatin C, creatinine and predicted creatinine clearance

Ann Clin Biochem. 2000 Jan;37 ( Pt 1):49-59. doi: 10.1258/0004563001901524.

Abstract

Serum cystatin C measurement has been previously shown by ourselves and others to be a better indicator of changes in glomerular filtration rate (GFR) than serum creatinine. However, the available literature on reference values for cystatin C concentration remains surprisingly sparse; we thus set out to determine an adult reference range. Blood was taken from 309 healthy blood donors and creatinine and cystatin C concentrations were measured using commercially available automated methodologies. In addition, predicted creatinine clearances were calculated using the Cockcroft and Gault formula. The 95% reference intervals for creatinine, predicted creatinine clearance and cystatin C for all blood donors, regardless of gender, were 68-118 mumol/L, 58-120 ml/min/1.73 m2 and 0.51-0.98 mg/L, respectively. For women, the intervals were 68-98 mumol/L, 60-119 ml/min/1.73 m2 and 0.49-0.94 mg/L; for men, they were 78-123 mumol/L, 57-122 ml/min/1.73 m2 and 0.56-0.98 mg/L. This mean 95% reference interval for cystatin C in all donors under 50 years of age was 0.53-0.92 mg/L; for those over 50 years of age it was 0.58-1.02 mg/L. The small difference between make and female ranges meant that a single reference range for cystatin C could be established for all adults under 50 years of age without adjustment for body surface area. Serum cystatin C measurement offers a simpler and more sensitive screening test than serum creatinine for early changes in GFR.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Clinical Laboratory Techniques / standards*
  • Creatinine / blood*
  • Cystatin C
  • Cystatins / blood*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Predictive Value of Tests
  • Reference Standards

Substances

  • CST3 protein, human
  • Cystatin C
  • Cystatins
  • Creatinine