Separate serum from cells within 2 hours of collection.
Analytic time may be extended if single frozen specimen is sent for multiple tests
Cystatin C: Adults (over age 18 years): 0.56 - 0.99 mg/L
eGFR will not be calculated for patients 18 years or underReference value for eGFR: ≥ 60 mL/min
Cystatin C inversely correlates with the glomerular filtration rate (GFR). Elevated levels of cystatin C indicate decreased GFR. Cystatin C may provide more accurate assessment of GFR in patients with muscle wasting or chronic illness.