title: [Usefulness of serum cystatin-C as a marker of the renal function: a comparative evaluation with beta 2-microglobulin, alpha 1-microglobulin and creatinine].
abstract: We evaluated the usefulness of cystatin-C as a marker of renal function. Serum cystatin-C level was measured using latex agglutination tests in 885 patients with various forms of renal disease and 200 healthy subjects. In addition to cystatin-C, serum beta 2-microglobulin, alpha 1-microglobulin and serum creatinine (Scr) were measured concomitantly in the same sample. The serum cystatin-C level inversely correlated more closely with creatinine clearance (Ccr) (r = -0.90) than serum beta 2-microglobulin (r = -0.85), alpha 1-microglobulin (r = -0.74) and Scr (r = -0.78). In patients with mildly impaired renal function (defined as Ccr 71-90 ml/min), a significant increase in cystatin-C level was observed in 24% of patients, whereas elevated beta 2-microglobulin and Scr were seen in 8% and elevated alpha 1-microglobulin was seen in 17%. In patients with normal renal function (defined as Ccr > or = 100 ml/min), increased cystatin-C level was observed in 7% of patients, whereas beta 2-microglobulin was seen in 2%, Scr in 2% and alpha 1-microglobulin in 11%. These data suggest that cystatin-C is a better marker of glomerular filtration than beta 2-microglobulin, alpha 1-microglobulin and Scr. Moreover cystatin-C measurement offers improved clinical sensitivity as a screening test for early renal damage.
authors.affiliation: Department of Nephrology, Sendai Shakaihoken Hospital, Miyagi, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Hotta
authors.forename: N
authors.initials: N
authors.lastname: Yusa
authors.forename: I
authors.initials: I
authors.lastname: Mukaiyama
authors.forename: Y
authors.initials: Y
authors.lastname: Taguma
mesh_terms: D000328:Adult; D000510:Alpha-Globulins / Q000032:analysis*; D015415:Biomarkers / Q000097:blood; D003404:Creatinine / Q000097:blood*; D055316:Cystatin C; D015891:Cystatins / Q000097:blood*; D005260:Female; D006801:Humans; D007668:Kidney / Q000502:physiology*; D007674:Kidney Diseases / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D001613:beta 2-Microglobulin / Q000032:analysis*
chemical_list: D000510:Alpha-Globulins; D015415:Biomarkers; C525030:CST3 protein, human; D055316:Cystatin C; D015891:Cystatins; C016001:alpha-1-microglobulin; D001613:beta 2-Microglobulin; D003404:Creatinine